SQLite

**   an error code (i.e. SQLITE_NOMEM) if an error occurs.
**
** xInst:
**   Query for the details of phrase match iIdx within the current row.
**   Phrase matches are numbered starting from zero, so the iIdx argument
**   should be greater than or equal to zero and smaller than the value
**   output by xInstCount().
**
**   Usually, output parameter *piPhrase is set to the phrase number, *piCol
**   to the column in which it occurs and *piOff the token offset of the
**   first token of the phrase. The exception is if the table was created
**   with the offsets=0 option specified. In this case *piOff is always
**   set to -1.
**
**   Returns SQLITE_OK if successful, or an error code (i.e. SQLITE_NOMEM) 
**   if an error occurs.
**
** xRowid:
**   Returns the rowid of the current row.
**

**   xInstCount/xInst APIs. While the xInstCount/xInst APIs are more convenient
**   to use, this API may be faster under some circumstances. To iterate 
**   through instances of phrase iPhrase, use the following code:
**
**       Fts5PhraseIter iter;
**       int iCol, iOff;
**       for(pApi->xPhraseFirst(pFts, iPhrase, &iter, &iCol, &iOff);
**           iOff>=0;
**           iCol>=0;
**           pApi->xPhraseNext(pFts, &iter, &iCol, &iOff)
**       ){
**         // An instance of phrase iPhrase at offset iOff of column iCol
**       }
**
**   The Fts5PhraseIter structure is defined above. Applications should not
**   modify this structure directly - it should only be used as shown above
**   with the xPhraseFirst() and xPhraseNext() API methods.
**
** xPhraseNext()
**   See xPhraseFirst above.
*/
struct Fts5ExtensionApi {
  int iVersion;                   /* Currently always set to 1 */
  int iVersion;                   /* Currently always set to 3 */

  void *(*xUserData)(Fts5Context*);

  int (*xColumnCount)(Fts5Context*);
  int (*xRowCount)(Fts5Context*, sqlite3_int64 *pnRow);
  int (*xColumnTotalSize)(Fts5Context*, int iCol, sqlite3_int64 *pnToken);

  int (*xQueryPhrase)(Fts5Context*, int iPhrase, void *pUserData,
    int(*)(const Fts5ExtensionApi*,Fts5Context*,void*)
  );
  int (*xSetAuxdata)(Fts5Context*, void *pAux, void(*xDelete)(void*));
  void *(*xGetAuxdata)(Fts5Context*, int bClear);

  void (*xPhraseFirst)(Fts5Context*, int iPhrase, Fts5PhraseIter*, int*, int*);
  int (*xPhraseFirst)(Fts5Context*, int iPhrase, Fts5PhraseIter*, int*, int*);
  void (*xPhraseNext)(Fts5Context*, Fts5PhraseIter*, int *piCol, int *piOff);

  int (*xPhraseFirstColumn)(Fts5Context*, int iPhrase, Fts5PhraseIter*, int*);
  void (*xPhraseNextColumn)(Fts5Context*, Fts5PhraseIter*, int *piCol);
};

/* 
** CUSTOM AUXILIARY FUNCTIONS
*************************************************************************/

/*************************************************************************

  u8 *abUnindexed;                /* True for unindexed columns */
  int nPrefix;                    /* Number of prefix indexes */
  int *aPrefix;                   /* Sizes in bytes of nPrefix prefix indexes */
  int eContent;                   /* An FTS5_CONTENT value */
  char *zContent;                 /* content table */ 
  char *zContentRowid;            /* "content_rowid=" option value */ 
  int bColumnsize;                /* "columnsize=" option value (dflt==1) */
  int eDetail;                    /* FTS5_DETAIL_XXX value */
  char *zContentExprlist;
  Fts5Tokenizer *pTok;
  fts5_tokenizer *pTokApi;

  /* Values loaded from the %_config table */
  int iCookie;                    /* Incremented when %_config is modified */
  int pgsz;                       /* Approximate page size used in %_data */

/* Current expected value of %_config table 'version' field */
#define FTS5_CURRENT_VERSION 4

#define FTS5_CONTENT_NORMAL   0
#define FTS5_CONTENT_NONE     1
#define FTS5_CONTENT_EXTERNAL 2

#define FTS5_DETAIL_FULL    0
#define FTS5_DETAIL_NONE    1
#define FTS5_DETAIL_COLUMNS 2



int sqlite3Fts5ConfigParse(
    Fts5Global*, sqlite3*, int, const char **, Fts5Config**, char**
);
void sqlite3Fts5ConfigFree(Fts5Config*);

/* Malloc utility */
void *sqlite3Fts5MallocZero(int *pRc, int nByte);
char *sqlite3Fts5Strndup(int *pRc, const char *pIn, int nIn);

/* Character set tests (like isspace(), isalpha() etc.) */
int sqlite3Fts5IsBareword(char t);


/* Bucket of terms object used by the integrity-check in offsets=0 mode. */
typedef struct Fts5Termset Fts5Termset;
int sqlite3Fts5TermsetNew(Fts5Termset**);
int sqlite3Fts5TermsetAdd(Fts5Termset*, int, const char*, int, int *pbPresent);
void sqlite3Fts5TermsetFree(Fts5Termset*);

/*
** End of interface to code in fts5_buffer.c.
**************************************************************************/

/**************************************************************************
** Interface to code in fts5_index.c. fts5_index.c contains contains code
** to access the data stored in the %_data table.

int sqlite3Fts5IndexReinit(Fts5Index *p);
int sqlite3Fts5IndexOptimize(Fts5Index *p);
int sqlite3Fts5IndexMerge(Fts5Index *p, int nMerge);

int sqlite3Fts5IndexLoadConfig(Fts5Index *p);

int sqlite3Fts5IterCollist(Fts5IndexIter*, const u8 **, int*);

/*
** End of interface to code in fts5_index.c.
**************************************************************************/

/**************************************************************************
** Interface to code in fts5_varint.c. 
*/

** Interface to code in fts5_hash.c. 
*/
typedef struct Fts5Hash Fts5Hash;

/*
** Create a hash table, free a hash table.
*/
int sqlite3Fts5HashNew(Fts5Hash**, int *pnSize);
int sqlite3Fts5HashNew(Fts5Config*, Fts5Hash**, int *pnSize);
void sqlite3Fts5HashFree(Fts5Hash*);

int sqlite3Fts5HashWrite(
  Fts5Hash*,
  i64 iRowid,                     /* Rowid for this entry */
  int iCol,                       /* Column token appears in (-ve -> delete) */
  int iPos,                       /* Position of token within column */

/* Called during startup to register a UDF with SQLite */
int sqlite3Fts5ExprInit(Fts5Global*, sqlite3*);

int sqlite3Fts5ExprPhraseCount(Fts5Expr*);
int sqlite3Fts5ExprPhraseSize(Fts5Expr*, int iPhrase);
int sqlite3Fts5ExprPoslist(Fts5Expr*, int, const u8 **);

typedef struct Fts5PoslistPopulator Fts5PoslistPopulator;
Fts5PoslistPopulator *sqlite3Fts5ExprClearPoslists(Fts5Expr*, int);
int sqlite3Fts5ExprPopulatePoslists(
    Fts5Config*, Fts5Expr*, Fts5PoslistPopulator*, int, const char*, int
);
void sqlite3Fts5ExprCheckPoslists(Fts5Expr*, i64);
void sqlite3Fts5ExprClearEof(Fts5Expr*);

int sqlite3Fts5ExprClonePhrase(Fts5Config*, Fts5Expr*, int, Fts5Expr**);

int sqlite3Fts5ExprPhraseCollist(Fts5Expr *, int, const u8 **, int *);

/*******************************************
** The fts5_expr.c API above this point is used by the other hand-written
** C code in this module. The interfaces below this point are called by
** the parser code in fts5parse.y.  */

void sqlite3Fts5ParseError(Fts5Parse *pParse, const char *zFmt, ...);

    1, 1, 1, 1, 1, 1, 1, 1,    1, 1, 1, 0, 0, 0, 0, 1,   /* 0x50 .. 0x5F */
    0, 1, 1, 1, 1, 1, 1, 1,    1, 1, 1, 1, 1, 1, 1, 1,   /* 0x60 .. 0x6F */
    1, 1, 1, 1, 1, 1, 1, 1,    1, 1, 1, 0, 0, 0, 0, 0    /* 0x70 .. 0x7F */
  };

  return (t & 0x80) || aBareword[(int)t];
}


/*************************************************************************
*/
typedef struct Fts5TermsetEntry Fts5TermsetEntry;
struct Fts5TermsetEntry {
  char *pTerm;
  int nTerm;
  int iIdx;                       /* Index (main or aPrefix[] entry) */
  Fts5TermsetEntry *pNext;
};

struct Fts5Termset {
  Fts5TermsetEntry *apHash[512];
};

int sqlite3Fts5TermsetNew(Fts5Termset **pp){
  int rc = SQLITE_OK;
  *pp = sqlite3Fts5MallocZero(&rc, sizeof(Fts5Termset));
  return rc;
}

int sqlite3Fts5TermsetAdd(
  Fts5Termset *p, 
  int iIdx,
  const char *pTerm, int nTerm, 
  int *pbPresent
){
  int rc = SQLITE_OK;
  *pbPresent = 0;
  if( p ){
    int i;
    int hash;
    Fts5TermsetEntry *pEntry;

    /* Calculate a hash value for this term */
    hash = 104 + iIdx;
    for(i=0; i<nTerm; i++){
      hash += (hash << 3) + (int)pTerm[i];
    }
    hash = hash % ArraySize(p->apHash);

    for(pEntry=p->apHash[hash]; pEntry; pEntry=pEntry->pNext){
      if( pEntry->iIdx==iIdx 
          && pEntry->nTerm==nTerm 
          && memcmp(pEntry->pTerm, pTerm, nTerm)==0 
        ){
        *pbPresent = 1;
        break;
      }
    }

    if( pEntry==0 ){
      pEntry = sqlite3Fts5MallocZero(&rc, sizeof(Fts5TermsetEntry) + nTerm);
      if( pEntry ){
        pEntry->pTerm = (char*)&pEntry[1];
        pEntry->nTerm = nTerm;
        pEntry->iIdx = iIdx;
        memcpy(pEntry->pTerm, pTerm, nTerm);
        pEntry->pNext = p->apHash[hash];
        p->apHash[hash] = pEntry;
      }
    }
  }

  return rc;
}

void sqlite3Fts5TermsetFree(Fts5Termset *p){
  if( p ){
    int i;
    for(i=0; i<ArraySize(p->apHash); i++){
      Fts5TermsetEntry *pEntry = p->apHash[i];
      while( pEntry ){
        Fts5TermsetEntry *pDel = pEntry;
        pEntry = pEntry->pNext;
        sqlite3_free(pDel);
      }
    }
    sqlite3_free(p);
  }
}

**
******************************************************************************
**
** This is an SQLite module implementing full-text search.
*/



#include "fts5Int.h"

#define FTS5_DEFAULT_PAGE_SIZE   4050
#define FTS5_DEFAULT_AUTOMERGE      4
#define FTS5_DEFAULT_CRISISMERGE   16
#define FTS5_DEFAULT_HASHSIZE    (1024*1024)

  assert( 0==fts5_iswhitespace(z[0]) );
  quote = z[0];
  if( quote=='[' || quote=='\'' || quote=='"' || quote=='`' ){
    fts5Dequote(z);
  }
}


struct Fts5Enum {
  const char *zName;
  int eVal;
};
typedef struct Fts5Enum Fts5Enum;

static int fts5ConfigSetEnum(
  const Fts5Enum *aEnum, 
  const char *zEnum, 
  int *peVal
){
  int nEnum = strlen(zEnum);
  int i;
  int iVal = -1;

  for(i=0; aEnum[i].zName; i++){
    if( sqlite3_strnicmp(aEnum[i].zName, zEnum, nEnum)==0 ){
      if( iVal>=0 ) return SQLITE_ERROR;
      iVal = aEnum[i].eVal;
    }
  }

  *peVal = iVal;
  return iVal<0 ? SQLITE_ERROR : SQLITE_OK;
}

/*
** Parse a "special" CREATE VIRTUAL TABLE directive and update
** configuration object pConfig as appropriate.
**
** If successful, object pConfig is updated and SQLITE_OK returned. If
** an error occurs, an SQLite error code is returned and an error message
** may be left in *pzErr. It is the responsibility of the caller to

      *pzErr = sqlite3_mprintf("malformed columnsize=... directive");
      rc = SQLITE_ERROR;
    }else{
      pConfig->bColumnsize = (zArg[0]=='1');
    }
    return rc;
  }

  if( sqlite3_strnicmp("detail", zCmd, nCmd)==0 ){
    const Fts5Enum aDetail[] = {
      { "none", FTS5_DETAIL_NONE },
      { "full", FTS5_DETAIL_FULL },
      { "columns", FTS5_DETAIL_COLUMNS },
      { 0, 0 }
    };

    if( rc = fts5ConfigSetEnum(aDetail, zArg, &pConfig->eDetail) ){
      *pzErr = sqlite3_mprintf("malformed detail=... directive");
    }
    return rc;
  }

  *pzErr = sqlite3_mprintf("unrecognized option: \"%.*s\"", nCmd, zCmd);
  return SQLITE_ERROR;
}

/*
** Allocate an instance of the default tokenizer ("simple") at 

  nByte = nArg * (sizeof(char*) + sizeof(u8));
  pRet->azCol = (char**)sqlite3Fts5MallocZero(&rc, nByte);
  pRet->abUnindexed = (u8*)&pRet->azCol[nArg];
  pRet->zDb = sqlite3Fts5Strndup(&rc, azArg[1], -1);
  pRet->zName = sqlite3Fts5Strndup(&rc, azArg[2], -1);
  pRet->bColumnsize = 1;
  pRet->eDetail = FTS5_DETAIL_FULL;
#ifdef SQLITE_DEBUG
  pRet->bPrefixIndex = 1;
#endif
  if( rc==SQLITE_OK && sqlite3_stricmp(pRet->zName, FTS5_RANK_NAME)==0 ){
    *pzErr = sqlite3_mprintf("reserved fts5 table name: %s", pRet->zName);
    rc = SQLITE_ERROR;
  }

#include <stdio.h>
void sqlite3Fts5ParserTrace(FILE*, char*);
#endif


struct Fts5Expr {
  Fts5Index *pIndex;
  Fts5Config *pConfig;
  Fts5ExprNode *pRoot;
  int bDesc;                      /* Iterate in descending rowid order */
  int nPhrase;                    /* Number of phrases in expression */
  Fts5ExprPhrase **apExprPhrase;  /* Pointers to phrase objects */
};

/*

    *ppNew = pNew = sqlite3_malloc(sizeof(Fts5Expr));
    if( pNew==0 ){
      sParse.rc = SQLITE_NOMEM;
      sqlite3Fts5ParseNodeFree(sParse.pExpr);
    }else{
      pNew->pRoot = sParse.pExpr;
      pNew->pIndex = 0;
      pNew->pConfig = pConfig;
      pNew->apExprPhrase = sParse.apPhrase;
      pNew->nPhrase = sParse.nPhrase;
      sParse.apPhrase = 0;
    }
  }

  sqlite3_free(sParse.apPhrase);

  if( pbEof && bRetValid==0 ) *pbEof = 1;
  return iRet;
}

/*
** Argument pTerm must be a synonym iterator.
*/
static int fts5ExprSynonymPoslist(
static int fts5ExprSynonymList(
  Fts5ExprTerm *pTerm, 
  int bCollist, 
  Fts5Colset *pColset,
  i64 iRowid,
  int *pbDel,                     /* OUT: Caller should sqlite3_free(*pa) */
  u8 **pa, int *pn
){
  Fts5PoslistReader aStatic[4];
  Fts5PoslistReader *aIter = aStatic;
  int nIter = 0;
  int nAlloc = 4;
  int rc = SQLITE_OK;
  Fts5ExprTerm *p;

  assert( pTerm->pSynonym );
  for(p=pTerm; p; p=p->pSynonym){
    Fts5IndexIter *pIter = p->pIter;
    if( sqlite3Fts5IterEof(pIter)==0 && sqlite3Fts5IterRowid(pIter)==iRowid ){
      const u8 *a;
      int n;

      if( bCollist ){
        rc = sqlite3Fts5IterCollist(pIter, &a, &n);
      }else{
      i64 dummy;
      rc = sqlite3Fts5IterPoslist(pIter, pColset, &a, &n, &dummy);
        i64 dummy;
        rc = sqlite3Fts5IterPoslist(pIter, pColset, &a, &n, &dummy);
      }

      if( rc!=SQLITE_OK ) goto synonym_poslist_out;
      if( n==0 ) continue;
      if( nIter==nAlloc ){
        int nByte = sizeof(Fts5PoslistReader) * nAlloc * 2;
        Fts5PoslistReader *aNew = (Fts5PoslistReader*)sqlite3_malloc(nByte);
        if( aNew==0 ){
          rc = SQLITE_NOMEM;
          goto synonym_poslist_out;
        }

  for(i=0; i<pPhrase->nTerm; i++){
    Fts5ExprTerm *pTerm = &pPhrase->aTerm[i];
    i64 dummy;
    int n = 0;
    int bFlag = 0;
    const u8 *a = 0;
    if( pTerm->pSynonym ){
      rc = fts5ExprSynonymPoslist(
          pTerm, pColset, pNode->iRowid, &bFlag, (u8**)&a, &n
      rc = fts5ExprSynonymList(
          pTerm, 0, pColset, pNode->iRowid, &bFlag, (u8**)&a, &n
      );
    }else{
      rc = sqlite3Fts5IterPoslist(pTerm->pIter, pColset, &a, &n, &dummy);
    }
    if( rc!=SQLITE_OK ) goto ismatch_out;
    sqlite3Fts5PoslistReaderInit(a, n, &aIter[i]);
    aIter[i].bFlag = (u8)bFlag;

static int fts5ExprNearTest(
  int *pRc,
  Fts5Expr *pExpr,                /* Expression that pNear is a part of */
  Fts5ExprNode *pNode             /* The "NEAR" node (FTS5_STRING) */
){
  Fts5ExprNearset *pNear = pNode->pNear;
  int rc = *pRc;

  if( pExpr->pConfig->eDetail!=FTS5_DETAIL_FULL ){
    Fts5ExprTerm *pTerm;
    Fts5ExprPhrase *pPhrase = pNear->apPhrase[0];
    pPhrase->poslist.n = 0;
    for(pTerm=&pPhrase->aTerm[0]; pTerm; pTerm=pTerm->pSynonym){
      Fts5IndexIter *pIter = pTerm->pIter;
      if( sqlite3Fts5IterEof(pIter)==0 ){
        int n;
        i64 iRowid;
        rc = sqlite3Fts5IterPoslist(pIter, pNear->pColset, 0, &n, &iRowid);
        if( rc!=SQLITE_OK ){
          *pRc = rc;
          return 0;
        }else if( iRowid==pNode->iRowid && n>0 ){
          pPhrase->poslist.n = 1;
        }
      }
    }
    return pPhrase->poslist.n;
  }else{
  int i;
    int i;

  /* Check that each phrase in the nearset matches the current row.
  ** Populate the pPhrase->poslist buffers at the same time. If any
  ** phrase is not a match, break out of the loop early.  */
  for(i=0; rc==SQLITE_OK && i<pNear->nPhrase; i++){
    Fts5ExprPhrase *pPhrase = pNear->apPhrase[i];
    if( pPhrase->nTerm>1 || pPhrase->aTerm[0].pSynonym || pNear->pColset ){
      int bMatch = 0;
      rc = fts5ExprPhraseIsMatch(pNode, pNear->pColset, pPhrase, &bMatch);
      if( bMatch==0 ) break;
    }else{
      rc = sqlite3Fts5IterPoslistBuffer(
          pPhrase->aTerm[0].pIter, &pPhrase->poslist
      );
    }
  }
    /* Check that each phrase in the nearset matches the current row.
    ** Populate the pPhrase->poslist buffers at the same time. If any
    ** phrase is not a match, break out of the loop early.  */
    for(i=0; rc==SQLITE_OK && i<pNear->nPhrase; i++){
      Fts5ExprPhrase *pPhrase = pNear->apPhrase[i];
      if( pPhrase->nTerm>1 || pPhrase->aTerm[0].pSynonym || pNear->pColset ){
        int bMatch = 0;
        rc = fts5ExprPhraseIsMatch(pNode, pNear->pColset, pPhrase, &bMatch);
        if( bMatch==0 ) break;
      }else{
        rc = sqlite3Fts5IterPoslistBuffer(
            pPhrase->aTerm[0].pIter, &pPhrase->poslist
        );
      }
    }

  *pRc = rc;
  if( i==pNear->nPhrase && (i==1 || fts5ExprNearIsMatch(pRc, pNear)) ){
    return 1;
  }
    *pRc = rc;
    if( i==pNear->nPhrase && (i==1 || fts5ExprNearIsMatch(pRc, pNear)) ){
      return 1;
    }

  return 0;
    return 0;
  }
}

static int fts5ExprTokenTest(
  Fts5Expr *pExpr,                /* Expression that pNear is a part of */
  Fts5ExprNode *pNode             /* The "NEAR" node (FTS5_TERM) */
){
  /* As this "NEAR" object is actually a single phrase that consists 

          }
          assert( rc!=SQLITE_OK || cmp<=0 );
          if( cmp || p2->bNomatch ) break;
          rc = fts5ExprNodeNext(pExpr, p1, 0, 0);
        }
        pNode->bEof = p1->bEof;
        pNode->iRowid = p1->iRowid;
        if( p1->bEof ){
          fts5ExprNodeZeroPoslist(p2);
        }
        break;
      }
    }
  }
  return rc;
}

      sCtx.pPhrase->aTerm[i].bPrefix = pOrig->aTerm[i].bPrefix;
    }
  }

  if( rc==SQLITE_OK ){
    /* All the allocations succeeded. Put the expression object together. */
    pNew->pIndex = pExpr->pIndex;
    pNew->pConfig = pExpr->pConfig;
    pNew->nPhrase = 1;
    pNew->apExprPhrase[0] = sCtx.pPhrase;
    pNew->pRoot->pNear->apPhrase[0] = sCtx.pPhrase;
    pNew->pRoot->pNear->nPhrase = 1;
    sCtx.pPhrase->pNode = pNew->pRoot;

    if( pOrig->nTerm==1 && pOrig->aTerm[0].pSynonym==0 ){

}

void sqlite3Fts5ParseSetColset(
  Fts5Parse *pParse, 
  Fts5ExprNearset *pNear, 
  Fts5Colset *pColset 
){
  if( pParse->pConfig->eDetail==FTS5_DETAIL_NONE ){
    pParse->rc = SQLITE_ERROR;
    pParse->zErr = sqlite3_mprintf(
      "fts5: column queries are not supported (detail=none)"
    );
    sqlite3_free(pColset);
    return;
  }

  if( pNear ){
    pNear->pColset = pColset;
  }else{
    sqlite3_free(pColset);
  }
}

      pRet->eType = eType;
      pRet->pNear = pNear;
      if( eType==FTS5_STRING ){
        int iPhrase;
        for(iPhrase=0; iPhrase<pNear->nPhrase; iPhrase++){
          pNear->apPhrase[iPhrase]->pNode = pRet;
        }
        if( pNear->nPhrase==1 
        if( pNear->nPhrase==1 && pNear->apPhrase[0]->nTerm==1 ){
         && pNear->apPhrase[0]->nTerm==1 
         && pNear->apPhrase[0]->aTerm[0].pSynonym==0
          if( pNear->apPhrase[0]->aTerm[0].pSynonym==0 ){
        ){
          pRet->eType = FTS5_TERM;
            pRet->eType = FTS5_TERM;
          }
        }else if( pParse->pConfig->eDetail!=FTS5_DETAIL_FULL ){
          assert( pParse->rc==SQLITE_OK );
          pParse->rc = SQLITE_ERROR;
          assert( pParse->zErr==0 );
          pParse->zErr = sqlite3_mprintf(
              "fts5: %s queries are not supported (detail!=full)", 
              pNear->nPhrase==1 ? "phrase": "NEAR"
          );
          sqlite3_free(pRet);
          pRet = 0;
        }
      }else{
        fts5ExprAddChildren(pRet, pLeft);
        fts5ExprAddChildren(pRet, pRight);
      }
    }
  }

    for(i=0; i<pNear->nPhrase; i++){
      Fts5ExprPhrase *pPhrase = pNear->apPhrase[i];

      zRet = fts5PrintfAppend(zRet, " {");
      for(iTerm=0; zRet && iTerm<pPhrase->nTerm; iTerm++){
        char *zTerm = pPhrase->aTerm[iTerm].zTerm;
        zRet = fts5PrintfAppend(zRet, "%s%s", iTerm==0?"":" ", zTerm);
        if( pPhrase->aTerm[iTerm].bPrefix ){
          zRet = fts5PrintfAppend(zRet, "*");
        }
      }

      if( zRet ) zRet = fts5PrintfAppend(zRet, "}");
      if( zRet==0 ) return 0;
    }

  }else{

    nRet = pPhrase->poslist.n;
  }else{
    *pa = 0;
    nRet = 0;
  }
  return nRet;
}

struct Fts5PoslistPopulator {
  Fts5PoslistWriter writer;
  int bOk;                        /* True if ok to populate */
  int bMiss;
};

Fts5PoslistPopulator *sqlite3Fts5ExprClearPoslists(Fts5Expr *pExpr, int bLive){
  Fts5PoslistPopulator *pRet;
  pRet = sqlite3_malloc(sizeof(Fts5PoslistPopulator)*pExpr->nPhrase);
  if( pRet ){
    int i;
    memset(pRet, 0, sizeof(Fts5PoslistPopulator)*pExpr->nPhrase);
    for(i=0; i<pExpr->nPhrase; i++){
      Fts5Buffer *pBuf = &pExpr->apExprPhrase[i]->poslist;
      Fts5ExprNode *pNode = pExpr->apExprPhrase[i]->pNode;
      assert( pExpr->apExprPhrase[i]->nTerm==1 );
      if( bLive && 
          (pBuf->n==0 || pNode->iRowid!=pExpr->pRoot->iRowid || pNode->bEof)
      ){
        pRet[i].bMiss = 1;
      }else{
        pBuf->n = 0;
      }
    }
  }
  return pRet;
}

struct Fts5ExprCtx {
  Fts5Expr *pExpr;
  Fts5PoslistPopulator *aPopulator;
  i64 iOff;
};
typedef struct Fts5ExprCtx Fts5ExprCtx;

/*
** TODO: Make this more efficient!
*/
static int fts5ExprColsetTest(Fts5Colset *pColset, int iCol){
  int i;
  for(i=0; i<pColset->nCol; i++){
    if( pColset->aiCol[i]==iCol ) return 1;
  }
  return 0;
}

static int fts5ExprPopulatePoslistsCb(
  void *pCtx,                /* Copy of 2nd argument to xTokenize() */
  int tflags,                /* Mask of FTS5_TOKEN_* flags */
  const char *pToken,        /* Pointer to buffer containing token */
  int nToken,                /* Size of token in bytes */
  int iStart,                /* Byte offset of token within input text */
  int iEnd                   /* Byte offset of end of token within input text */
){
  Fts5ExprCtx *p = (Fts5ExprCtx*)pCtx;
  Fts5Expr *pExpr = p->pExpr;
  int i;

  if( (tflags & FTS5_TOKEN_COLOCATED)==0 ) p->iOff++;
  for(i=0; i<pExpr->nPhrase; i++){
    Fts5ExprTerm *pTerm;
    if( p->aPopulator[i].bOk==0 ) continue;
    for(pTerm=&pExpr->apExprPhrase[i]->aTerm[0]; pTerm; pTerm=pTerm->pSynonym){
      int nTerm = strlen(pTerm->zTerm);
      if( (nTerm==nToken || (nTerm<nToken && pTerm->bPrefix))
       && memcmp(pTerm->zTerm, pToken, nTerm)==0
      ){
        int rc = sqlite3Fts5PoslistWriterAppend(
            &pExpr->apExprPhrase[i]->poslist, &p->aPopulator[i].writer, p->iOff
        );
        if( rc ) return rc;
        break;
      }
    }
  }
  return SQLITE_OK;
}

int sqlite3Fts5ExprPopulatePoslists(
  Fts5Config *pConfig,
  Fts5Expr *pExpr, 
  Fts5PoslistPopulator *aPopulator,
  int iCol, 
  const char *z, int n
){
  int i;
  Fts5ExprCtx sCtx;
  sCtx.pExpr = pExpr;
  sCtx.aPopulator = aPopulator;
  sCtx.iOff = (((i64)iCol) << 32) - 1;

  for(i=0; i<pExpr->nPhrase; i++){
    Fts5ExprNode *pNode = pExpr->apExprPhrase[i]->pNode;
    Fts5Colset *pColset = pNode->pNear->pColset;
    if( (pColset && 0==fts5ExprColsetTest(pColset, iCol)) 
     || aPopulator[i].bMiss
    ){
      aPopulator[i].bOk = 0;
    }else{
      aPopulator[i].bOk = 1;
    }
  }

  return sqlite3Fts5Tokenize(pConfig, 
      FTS5_TOKENIZE_AUX, z, n, (void*)&sCtx, fts5ExprPopulatePoslistsCb
  );
}

static void fts5ExprClearPoslists(Fts5ExprNode *pNode){
  if( pNode->eType==FTS5_TERM || pNode->eType==FTS5_STRING ){
    pNode->pNear->apPhrase[0]->poslist.n = 0;
  }else{
    int i;
    for(i=0; i<pNode->nChild; i++){
      fts5ExprClearPoslists(pNode->apChild[i]);
    }
  }
}

static int fts5ExprCheckPoslists(Fts5ExprNode *pNode, i64 iRowid){
  if( pNode ){
    pNode->iRowid = iRowid;
    pNode->bEof = 0;
    switch( pNode->eType ){
      case FTS5_TERM:
      case FTS5_STRING:
        return (pNode->pNear->apPhrase[0]->poslist.n>0);

      case FTS5_AND: {
        int i;
        for(i=0; i<pNode->nChild; i++){
          if( fts5ExprCheckPoslists(pNode->apChild[i], iRowid)==0 ){
            fts5ExprClearPoslists(pNode);
            return 0;
          }
        }
        return 1;
      }

      case FTS5_OR: {
        int i;
        int bRet = 0;
        for(i=0; i<pNode->nChild; i++){
          if( fts5ExprCheckPoslists(pNode->apChild[i], iRowid) ){
            bRet = 1;
          }
        }
        if( bRet==0 ){
          fts5ExprClearPoslists(pNode);
        }
        return bRet;
      }

      default: {
        assert( pNode->eType==FTS5_NOT );
        if( 0==fts5ExprCheckPoslists(pNode->apChild[0], iRowid)
         || 0!=fts5ExprCheckPoslists(pNode->apChild[1], iRowid)
        ){
          fts5ExprClearPoslists(pNode);
          return 0;
        }
        return 1;
      }
    }
  }
}

void sqlite3Fts5ExprCheckPoslists(Fts5Expr *pExpr, i64 iRowid){
  fts5ExprCheckPoslists(pExpr->pRoot, iRowid);
}

static void fts5ExprClearEof(Fts5ExprNode *pNode){
  int i;
  for(i=0; i<pNode->nChild; i++){
    fts5ExprClearEof(pNode->apChild[i]);
  }
  pNode->bEof = 0;
}
void sqlite3Fts5ExprClearEof(Fts5Expr *pExpr){
  fts5ExprClearEof(pExpr->pRoot);
}

/*
** This function is only called for detail=columns tables. 
*/
int sqlite3Fts5ExprPhraseCollist(
  Fts5Expr *pExpr, 
  int iPhrase, 
  const u8 **ppCollist, 
  int *pnCollist
){
  Fts5ExprPhrase *pPhrase = pExpr->apExprPhrase[iPhrase];
  Fts5ExprNode *pNode = pPhrase->pNode;
  int rc = SQLITE_OK;

  assert( iPhrase>=0 && iPhrase<pExpr->nPhrase );
  if( pNode->bEof==0 
   && pNode->iRowid==pExpr->pRoot->iRowid 
   && pPhrase->poslist.n>0
  ){
    Fts5ExprTerm *pTerm = &pPhrase->aTerm[0];
    if( pTerm->pSynonym ){
      int bDel = 0;
      u8 *a;
      rc = fts5ExprSynonymList(
          pTerm, 1, 0, pNode->iRowid, &bDel, &a, pnCollist
      );
      if( bDel ){
        sqlite3Fts5BufferSet(&rc, &pPhrase->poslist, *pnCollist, a);
        *ppCollist = pPhrase->poslist.p;
        sqlite3_free(a);
      }else{
        *ppCollist = a;
      }
    }else{
      sqlite3Fts5IterCollist(pPhrase->aTerm[0].pIter, ppCollist, pnCollist);
    }
  }else{
    *ppCollist = 0;
    *pnCollist = 0;
  }

  return rc;
}

** This file contains the implementation of an in-memory hash table used
** to accumuluate "term -> doclist" content before it is flused to a level-0
** segment.
*/


struct Fts5Hash {
  int eDetail;                    /* Copy of Fts5Config.eDetail */
  int *pnByte;                    /* Pointer to bytes counter */
  int nEntry;                     /* Number of entries currently in hash */
  int nSlot;                      /* Size of aSlot[] array */
  Fts5HashEntry *pScan;           /* Current ordered scan item */
  Fts5HashEntry **aSlot;          /* Array of hash slots */
};

  Fts5HashEntry *pHashNext;       /* Next hash entry with same hash-key */
  Fts5HashEntry *pScanNext;       /* Next entry in sorted order */
  
  int nAlloc;                     /* Total size of allocation */
  int iSzPoslist;                 /* Offset of space for 4-byte poslist size */
  int nData;                      /* Total bytes of data (incl. structure) */
  u8 bDel;                        /* Set delete-flag @ iSzPoslist */
  u8 bContent;                    /* Set content-flag (detail=none mode) */

  int iCol;                       /* Column of last value written */
  int iPos;                       /* Position of last value written */
  i64 iRowid;                     /* Rowid of last value written */
  char zKey[8];                   /* Nul-terminated entry key */
};

/*
** Size of Fts5HashEntry without the zKey[] array.
*/
#define FTS5_HASHENTRYSIZE (sizeof(Fts5HashEntry)-8)



/*
** Allocate a new hash table.
*/
int sqlite3Fts5HashNew(Fts5Hash **ppNew, int *pnByte){
int sqlite3Fts5HashNew(Fts5Config *pConfig, Fts5Hash **ppNew, int *pnByte){
  int rc = SQLITE_OK;
  Fts5Hash *pNew;

  *ppNew = pNew = (Fts5Hash*)sqlite3_malloc(sizeof(Fts5Hash));
  if( pNew==0 ){
    rc = SQLITE_NOMEM;
  }else{
    int nByte;
    memset(pNew, 0, sizeof(Fts5Hash));
    pNew->pnByte = pnByte;
    pNew->eDetail = pConfig->eDetail;

    pNew->nSlot = 1024;
    nByte = sizeof(Fts5HashEntry*) * pNew->nSlot;
    pNew->aSlot = (Fts5HashEntry**)sqlite3_malloc(nByte);
    if( pNew->aSlot==0 ){
      sqlite3_free(pNew);
      *ppNew = 0;

  sqlite3_free(apOld);
  pHash->nSlot = nNew;
  pHash->aSlot = apNew;
  return SQLITE_OK;
}

static void fts5HashAddPoslistSize(Fts5HashEntry *p){
static void fts5HashAddPoslistSize(Fts5Hash *pHash, Fts5HashEntry *p){
  if( p->iSzPoslist ){
    u8 *pPtr = (u8*)p;
    if( pHash->eDetail==FTS5_DETAIL_NONE ){
      assert( p->nData==p->iSzPoslist );
      if( p->bDel ){
        pPtr[p->nData++] = 0x00;
        if( p->bContent ){
          pPtr[p->nData++] = 0x00;
        }
      }
    }else{
    int nSz = (p->nData - p->iSzPoslist - 1);         /* Size in bytes */
    int nPos = nSz*2 + p->bDel;                       /* Value of nPos field */
      int nSz = (p->nData - p->iSzPoslist - 1);       /* Size in bytes */
      int nPos = nSz*2 + p->bDel;                     /* Value of nPos field */

    assert( p->bDel==0 || p->bDel==1 );
    if( nPos<=127 ){
      pPtr[p->iSzPoslist] = (u8)nPos;
    }else{
      int nByte = sqlite3Fts5GetVarintLen((u32)nPos);
      memmove(&pPtr[p->iSzPoslist + nByte], &pPtr[p->iSzPoslist + 1], nSz);
      sqlite3Fts5PutVarint(&pPtr[p->iSzPoslist], nPos);
      p->nData += (nByte-1);
    }
    p->bDel = 0;
      assert( p->bDel==0 || p->bDel==1 );
      if( nPos<=127 ){
        pPtr[p->iSzPoslist] = (u8)nPos;
      }else{
        int nByte = sqlite3Fts5GetVarintLen((u32)nPos);
        memmove(&pPtr[p->iSzPoslist + nByte], &pPtr[p->iSzPoslist + 1], nSz);
        sqlite3Fts5PutVarint(&pPtr[p->iSzPoslist], nPos);
        p->nData += (nByte-1);
      }
    }

    p->iSzPoslist = 0;
    p->bDel = 0;
    p->bContent = 0;
  }
}

/*
** Add an entry to the in-memory hash table. The key is the concatenation
** of bByte and (pToken/nToken). The value is (iRowid/iCol/iPos).
**
**     (bByte || pToken) -> (iRowid,iCol,iPos)
**
** Or, if iCol is negative, then the value is a delete marker.
*/
int sqlite3Fts5HashWrite(
  Fts5Hash *pHash,
  i64 iRowid,                     /* Rowid for this entry */
  int iCol,                       /* Column token appears in (-ve -> delete) */
  int iPos,                       /* Position of token within column */
  char bByte,                     /* First byte of token */
  const char *pToken, int nToken  /* Token to add or remove to or from index */
){
  unsigned int iHash;
  Fts5HashEntry *p;
  u8 *pPtr;
  int nIncr = 0;                  /* Amount to increment (*pHash->pnByte) by */
  int bNew;                       /* If non-delete entry should be written */
  
  bNew = (pHash->eDetail==FTS5_DETAIL_FULL);

  /* Attempt to locate an existing hash entry */
  iHash = fts5HashKey2(pHash->nSlot, (u8)bByte, (const u8*)pToken, nToken);
  for(p=pHash->aSlot[iHash]; p; p=p->pHashNext){
    if( p->zKey[0]==bByte 
     && memcmp(&p->zKey[1], pToken, nToken)==0 
     && p->zKey[nToken+1]==0 
    ){
      break;
    }
  }

  /* If an existing hash entry cannot be found, create a new one. */
  if( p==0 ){
    /* Figure out how much space to allocate */
    int nByte = FTS5_HASHENTRYSIZE + (nToken+1) + 1 + 64;
    if( nByte<128 ) nByte = 128;

    /* Grow the Fts5Hash.aSlot[] array if necessary. */
    if( (pHash->nEntry*2)>=pHash->nSlot ){
      int rc = fts5HashResize(pHash);
      if( rc!=SQLITE_OK ) return rc;
      iHash = fts5HashKey2(pHash->nSlot, (u8)bByte, (const u8*)pToken, nToken);
    }

    /* Allocate new Fts5HashEntry and add it to the hash table. */
    p = (Fts5HashEntry*)sqlite3_malloc(nByte);
    if( !p ) return SQLITE_NOMEM;
    memset(p, 0, FTS5_HASHENTRYSIZE);
    p->nAlloc = nByte;
    p->zKey[0] = bByte;
    memcpy(&p->zKey[1], pToken, nToken);
    assert( iHash==fts5HashKey(pHash->nSlot, (u8*)p->zKey, nToken+1) );
    p->zKey[nToken+1] = '\0';
    p->nData = nToken+1 + 1 + FTS5_HASHENTRYSIZE;
    p->nData += sqlite3Fts5PutVarint(&((u8*)p)[p->nData], iRowid);
    p->iSzPoslist = p->nData;
    p->nData += 1;
    p->iRowid = iRowid;
    p->pHashNext = pHash->aSlot[iHash];
    pHash->aSlot[iHash] = p;
    pHash->nEntry++;

    /* Add the first rowid field to the hash-entry */
    p->nData += sqlite3Fts5PutVarint(&((u8*)p)[p->nData], iRowid);
    p->iRowid = iRowid;

    nIncr += p->nData;
  }
    p->iSzPoslist = p->nData;
    if( pHash->eDetail!=FTS5_DETAIL_NONE ){
      p->nData += 1;
      p->iCol = (pHash->eDetail==FTS5_DETAIL_FULL ? 0 : -1);
    }

    nIncr += p->nData;
  }else{

    /* Appending to an existing hash-entry. Check that there is enough 
  /* Check there is enough space to append a new entry. Worst case scenario
  ** is:
  **
  **     + 9 bytes for a new rowid,
  **     + 4 byte reserved for the "poslist size" varint.
  **     + 1 byte for a "new column" byte,
  **     + 3 bytes for a new column number (16-bit max) as a varint,
  **     + 5 bytes for the new position offset (32-bit max).
  */
  if( (p->nAlloc - p->nData) < (9 + 4 + 1 + 3 + 5) ){
    int nNew = p->nAlloc * 2;
    Fts5HashEntry *pNew;
    Fts5HashEntry **pp;
    pNew = (Fts5HashEntry*)sqlite3_realloc(p, nNew);
    if( pNew==0 ) return SQLITE_NOMEM;
    pNew->nAlloc = nNew;
    for(pp=&pHash->aSlot[iHash]; *pp!=p; pp=&(*pp)->pHashNext);
    *pp = pNew;
    p = pNew;
  }
    ** space to append the largest possible new entry. Worst case scenario 
    ** is:
    **
    **     + 9 bytes for a new rowid,
    **     + 4 byte reserved for the "poslist size" varint.
    **     + 1 byte for a "new column" byte,
    **     + 3 bytes for a new column number (16-bit max) as a varint,
    **     + 5 bytes for the new position offset (32-bit max).
    */
    if( (p->nAlloc - p->nData) < (9 + 4 + 1 + 3 + 5) ){
      int nNew = p->nAlloc * 2;
      Fts5HashEntry *pNew;
      Fts5HashEntry **pp;
      pNew = (Fts5HashEntry*)sqlite3_realloc(p, nNew);
      if( pNew==0 ) return SQLITE_NOMEM;
      pNew->nAlloc = nNew;
      for(pp=&pHash->aSlot[iHash]; *pp!=p; pp=&(*pp)->pHashNext);
      *pp = pNew;
      p = pNew;
    }
  pPtr = (u8*)p;
  nIncr -= p->nData;
    nIncr -= p->nData;
  }
  assert( (p->nAlloc - p->nData) >= (9 + 4 + 1 + 3 + 5) );

  pPtr = (u8*)p;

  /* If this is a new rowid, append the 4-byte size field for the previous
  ** entry, and the new rowid for this entry.  */
  if( iRowid!=p->iRowid ){
    fts5HashAddPoslistSize(p);
    fts5HashAddPoslistSize(pHash, p);
    p->nData += sqlite3Fts5PutVarint(&pPtr[p->nData], iRowid - p->iRowid);
    p->iRowid = iRowid;
    bNew = 1;
    p->iSzPoslist = p->nData;
    if( pHash->eDetail!=FTS5_DETAIL_NONE ){
    p->nData += 1;
    p->iCol = 0;
    p->iPos = 0;
      p->nData += 1;
      p->iCol = (pHash->eDetail==FTS5_DETAIL_FULL ? 0 : -1);
      p->iPos = 0;
    p->iRowid = iRowid;
  }

    }
  }

  if( iCol>=0 ){
    if( pHash->eDetail==FTS5_DETAIL_NONE ){
      p->bContent = 1;
    }else{
    /* Append a new column value, if necessary */
    assert( iCol>=p->iCol );
    if( iCol!=p->iCol ){
      pPtr[p->nData++] = 0x01;
      p->nData += sqlite3Fts5PutVarint(&pPtr[p->nData], iCol);
      p->iCol = iCol;
      p->iPos = 0;
    }

    /* Append the new position offset */
    p->nData += sqlite3Fts5PutVarint(&pPtr[p->nData], iPos - p->iPos + 2);
    p->iPos = iPos;
      /* Append a new column value, if necessary */
      assert( iCol>=p->iCol );
      if( iCol!=p->iCol ){
        if( pHash->eDetail==FTS5_DETAIL_FULL ){
          pPtr[p->nData++] = 0x01;
          p->nData += sqlite3Fts5PutVarint(&pPtr[p->nData], iCol);
          p->iCol = iCol;
          p->iPos = 0;
        }else{
          bNew = 1;
          p->iCol = iPos = iCol;
        }
      }

      /* Append the new position offset, if necessary */
      if( bNew ){
        p->nData += sqlite3Fts5PutVarint(&pPtr[p->nData], iPos - p->iPos + 2);
        p->iPos = iPos;
      }
    }
  }else{
    /* This is a delete. Set the delete flag. */
    p->bDel = 1;
  }
  nIncr += p->nData;

  nIncr += p->nData;
  *pHash->pnByte += nIncr;
  return SQLITE_OK;
}


/*
** Arguments pLeft and pRight point to linked-lists of hash-entry objects,

  Fts5HashEntry *p;

  for(p=pHash->aSlot[iHash]; p; p=p->pHashNext){
    if( memcmp(p->zKey, pTerm, nTerm)==0 && p->zKey[nTerm]==0 ) break;
  }

  if( p ){
    fts5HashAddPoslistSize(p);
    fts5HashAddPoslistSize(pHash, p);
    *ppDoclist = (const u8*)&p->zKey[nTerm+1];
    *pnDoclist = p->nData - (FTS5_HASHENTRYSIZE + nTerm + 1);
  }else{
    *ppDoclist = 0;
    *pnDoclist = 0;
  }

  const char **pzTerm,            /* OUT: term (nul-terminated) */
  const u8 **ppDoclist,           /* OUT: pointer to doclist */
  int *pnDoclist                  /* OUT: size of doclist in bytes */
){
  Fts5HashEntry *p;
  if( (p = pHash->pScan) ){
    int nTerm = (int)strlen(p->zKey);
    fts5HashAddPoslistSize(p);
    fts5HashAddPoslistSize(pHash, p);
    *pzTerm = p->zKey;
    *ppDoclist = (const u8*)&p->zKey[nTerm+1];
    *pnDoclist = p->nData - (FTS5_HASHENTRYSIZE + nTerm + 1);
  }else{
    *pzTerm = 0;
    *ppDoclist = 0;
    *pnDoclist = 0;
  }
}

  Fts5StructureSegment *pSeg;     /* Segment to iterate through */
  int flags;                      /* Mask of configuration flags */
  int iLeafPgno;                  /* Current leaf page number */
  Fts5Data *pLeaf;                /* Current leaf data */
  Fts5Data *pNextLeaf;            /* Leaf page (iLeafPgno+1) */
  int iLeafOffset;                /* Byte offset within current leaf */

  /* Next method */
  void (*xNext)(Fts5Index*, Fts5SegIter*, int*);

  /* The page and offset from which the current term was read. The offset 
  ** is the offset of the first rowid in the current doclist.  */
  int iTermLeafPgno;
  int iTermLeafOffset;

  int iPgidxOff;                  /* Next offset in pgidx */
  int iEndofDoclist;

  /* The following are only used if the FTS5_SEGITER_REVERSE flag is set. */
  int iRowidOffset;               /* Current entry in aRowidOffset[] */
  int nRowidOffset;               /* Allocated size of aRowidOffset[] array */
  int *aRowidOffset;              /* Array of offset to rowid fields */

  Fts5DlidxIter *pDlidx;          /* If there is a doclist-index */

  /* Variables populated based on current entry. */
  Fts5Buffer term;                /* Current term */
  i64 iRowid;                     /* Current rowid */
  int nPos;                       /* Number of bytes in current position list */
  int bDel;                       /* True if the delete flag is set */
  u8 bDel;                        /* True if the delete flag is set */
};

/*
** Argument is a pointer to an Fts5Data structure that contains a 
** leaf page.
*/
#define ASSERT_SZLEAF_OK(x) assert( \
    (x)->szLeaf==(x)->nn || (x)->szLeaf==fts5GetU16(&(x)->p[2]) \
)

#define FTS5_SEGITER_ONETERM 0x01
#define FTS5_SEGITER_REVERSE 0x02


/* 
** Argument is a pointer to an Fts5Data structure that contains a leaf
** page. This macro evaluates to true if the leaf contains no terms, or
** false if it contains at least one term.
*/
#define fts5LeafIsTermless(x) ((x)->szLeaf >= (x)->nn)

**
** Leave Fts5SegIter.iLeafOffset pointing to the first byte of the 
** position list content (if any).
*/
static void fts5SegIterLoadNPos(Fts5Index *p, Fts5SegIter *pIter){
  if( p->rc==SQLITE_OK ){
    int iOff = pIter->iLeafOffset;  /* Offset to read at */
    int nSz;
    ASSERT_SZLEAF_OK(pIter->pLeaf);
    if( p->pConfig->eDetail==FTS5_DETAIL_NONE ){
      int iEod = MIN(pIter->iEndofDoclist, pIter->pLeaf->szLeaf);
      pIter->bDel = 0;
      pIter->nPos = 1;
      if( iOff<iEod && pIter->pLeaf->p[iOff]==0 ){
        pIter->bDel = 1;
        iOff++;
        if( iOff<iEod && pIter->pLeaf->p[iOff]==0 ){
          pIter->nPos = 1;
          iOff++;
        }else{
          pIter->nPos = 0;
        }
      }
    }else{
      int nSz;
    fts5FastGetVarint32(pIter->pLeaf->p, iOff, nSz);
    pIter->bDel = (nSz & 0x0001);
    pIter->nPos = nSz>>1;
      fts5FastGetVarint32(pIter->pLeaf->p, iOff, nSz);
      pIter->bDel = (nSz & 0x0001);
      pIter->nPos = nSz>>1;
    pIter->iLeafOffset = iOff;
    assert_nc( pIter->nPos>=0 );
      assert_nc( pIter->nPos>=0 );
    }
    pIter->iLeafOffset = iOff;
  }
}

static void fts5SegIterLoadRowid(Fts5Index *p, Fts5SegIter *pIter){
  u8 *a = pIter->pLeaf->p;        /* Buffer to read data from */
  int iOff = pIter->iLeafOffset;

    int nExtra;
    pIter->iPgidxOff += fts5GetVarint32(&a[pIter->iPgidxOff], nExtra);
    pIter->iEndofDoclist += nExtra;
  }

  fts5SegIterLoadRowid(p, pIter);
}

static void fts5SegIterNext(Fts5Index*, Fts5SegIter*, int*);
static void fts5SegIterNext_Reverse(Fts5Index*, Fts5SegIter*, int*);
static void fts5SegIterNext_None(Fts5Index*, Fts5SegIter*, int*);

static void fts5SegIterSetNext(Fts5Index *p, Fts5SegIter *pIter){
  if( pIter->flags & FTS5_SEGITER_REVERSE ){
    pIter->xNext = fts5SegIterNext_Reverse;
  }else if( p->pConfig->eDetail==FTS5_DETAIL_NONE ){
    pIter->xNext = fts5SegIterNext_None;
  }else{
    pIter->xNext = fts5SegIterNext;
  }
}

/*
** Initialize the iterator object pIter to iterate through the entries in
** segment pSeg. The iterator is left pointing to the first entry when 
** this function returns.
**
** If an error occurs, Fts5Index.rc is set to an appropriate error code. If 

    ** at EOF already. */
    assert( pIter->pLeaf==0 );
    return;
  }

  if( p->rc==SQLITE_OK ){
    memset(pIter, 0, sizeof(*pIter));
    fts5SegIterSetNext(p, pIter);
    pIter->pSeg = pSeg;
    pIter->iLeafPgno = pSeg->pgnoFirst-1;
    fts5SegIterNextPage(p, pIter);
  }

  if( p->rc==SQLITE_OK ){
    pIter->iLeafOffset = 4;

** This function advances the iterator so that it points to the last 
** relevant rowid on the page and, if necessary, initializes the 
** aRowidOffset[] and iRowidOffset variables. At this point the iterator
** is in its regular state - Fts5SegIter.iLeafOffset points to the first
** byte of the position list content associated with said rowid.
*/
static void fts5SegIterReverseInitPage(Fts5Index *p, Fts5SegIter *pIter){
  int eDetail = p->pConfig->eDetail;
  int n = pIter->pLeaf->szLeaf;
  int i = pIter->iLeafOffset;
  u8 *a = pIter->pLeaf->p;
  int iRowidOffset = 0;

  if( n>pIter->iEndofDoclist ){
    n = pIter->iEndofDoclist;
  }

  ASSERT_SZLEAF_OK(pIter->pLeaf);
  while( 1 ){
    i64 iDelta = 0;

    if( eDetail==FTS5_DETAIL_NONE ){
      /* todo */
      if( i<n && a[i]==0 ){
        i++;
        if( i<n && a[i]==0 ) i++;
      }
    }else{
    int nPos;
    int bDummy;
      int nPos;
      int bDummy;

    i += fts5GetPoslistSize(&a[i], &nPos, &bDummy);
    i += nPos;
      i += fts5GetPoslistSize(&a[i], &nPos, &bDummy);
      i += nPos;
    }
    if( i>=n ) break;
    i += fts5GetVarint(&a[i], (u64*)&iDelta);
    pIter->iRowid += iDelta;

    /* If necessary, grow the pIter->aRowidOffset[] array. */
    if( iRowidOffset>=pIter->nRowidOffset ){
      int nNew = pIter->nRowidOffset + 8;
      int *aNew = (int*)sqlite3_realloc(pIter->aRowidOffset, nNew*sizeof(int));
      if( aNew==0 ){
        p->rc = SQLITE_NOMEM;
        break;
      }

** points to a delete marker. A delete marker is an entry with a 0 byte
** position-list.
*/
static int fts5MultiIterIsEmpty(Fts5Index *p, Fts5IndexIter *pIter){
  Fts5SegIter *pSeg = &pIter->aSeg[pIter->aFirst[1].iFirst];
  return (p->rc==SQLITE_OK && pSeg->pLeaf && pSeg->nPos==0);
}

/*
** Advance iterator pIter to the next entry.
**
** This version of fts5SegIterNext() is only used by reverse iterators.
*/
static void fts5SegIterNext_Reverse(
  Fts5Index *p,                   /* FTS5 backend object */
  Fts5SegIter *pIter,             /* Iterator to advance */
  int *pbNewTerm                  /* OUT: Set for new term */
){
  assert( pIter->flags & FTS5_SEGITER_REVERSE );
  assert( pIter->pNextLeaf==0 );
  if( pIter->iRowidOffset>0 ){
    u8 *a = pIter->pLeaf->p;
    int iOff;
    int nPos;
    int bDummy;
    i64 iDelta;

    pIter->iRowidOffset--;
    pIter->iLeafOffset = pIter->aRowidOffset[pIter->iRowidOffset];
    fts5SegIterLoadNPos(p, pIter);
    iOff = pIter->iLeafOffset;
    if( p->pConfig->eDetail!=FTS5_DETAIL_NONE ){
      iOff += pIter->nPos;
    }
    fts5GetVarint(&a[iOff], (u64*)&iDelta);
    pIter->iRowid -= iDelta;
  }else{
    fts5SegIterReverseNewPage(p, pIter);
  }
}

/*
** Advance iterator pIter to the next entry.
**
** This version of fts5SegIterNext() is only used if detail=none and the
** iterator is not a reverse direction iterator.
*/
static void fts5SegIterNext_None(
  Fts5Index *p,                   /* FTS5 backend object */
  Fts5SegIter *pIter,             /* Iterator to advance */
  int *pbNewTerm                  /* OUT: Set for new term */
){
  int iOff;

  assert( p->rc==SQLITE_OK );
  assert( (pIter->flags & FTS5_SEGITER_REVERSE)==0 );
  assert( p->pConfig->eDetail==FTS5_DETAIL_NONE );

  ASSERT_SZLEAF_OK(pIter->pLeaf);
  iOff = pIter->iLeafOffset;

  /* Next entry is on the next page */
  if( pIter->pSeg && iOff>=pIter->pLeaf->szLeaf ){
    fts5SegIterNextPage(p, pIter);
    if( p->rc || pIter->pLeaf==0 ) return;
    pIter->iRowid = 0;
    iOff = 4;
  }

  if( iOff<pIter->iEndofDoclist ){
    /* Next entry is on the current page */
    i64 iDelta;
    iOff += sqlite3Fts5GetVarint(&pIter->pLeaf->p[iOff], &iDelta);
    pIter->iLeafOffset = iOff;
    pIter->iRowid += iDelta;
  }else if( (pIter->flags & FTS5_SEGITER_ONETERM)==0 ){
    if( pIter->pSeg ){
      int nKeep = 0;
      if( iOff!=fts5LeafFirstTermOff(pIter->pLeaf) ){
        iOff += fts5GetVarint32(&pIter->pLeaf->p[iOff], nKeep);
      }
      pIter->iLeafOffset = iOff;
      fts5SegIterLoadTerm(p, pIter, nKeep);
    }else{
      const u8 *pList = 0;
      const char *zTerm = 0;
      int nList;
      sqlite3Fts5HashScanNext(p->pHash);
      sqlite3Fts5HashScanEntry(p->pHash, &zTerm, &pList, &nList);
      if( pList==0 ) goto next_none_eof;
      pIter->pLeaf->p = (u8*)pList;
      pIter->pLeaf->nn = nList;
      pIter->pLeaf->szLeaf = nList;
      pIter->iEndofDoclist = nList;
      sqlite3Fts5BufferSet(&p->rc,&pIter->term, (int)strlen(zTerm), (u8*)zTerm);
      pIter->iLeafOffset = fts5GetVarint(pList, (u64*)&pIter->iRowid);
    }

    if( pbNewTerm ) *pbNewTerm = 1;
  }else{
    goto next_none_eof;
  }

  fts5SegIterLoadNPos(p, pIter);

  return;
 next_none_eof:
  fts5DataRelease(pIter->pLeaf);
  pIter->pLeaf = 0;
}


/*
** Advance iterator pIter to the next entry. 
**
** If an error occurs, Fts5Index.rc is set to an appropriate error code. It 
** is not considered an error if the iterator reaches EOF. If an error has 
** already occurred when this function is called, it is a no-op.
*/
static void fts5SegIterNext(
  Fts5Index *p,                   /* FTS5 backend object */
  Fts5SegIter *pIter,             /* Iterator to advance */
  int *pbNewTerm                  /* OUT: Set for new term */
){
  assert( pbNewTerm==0 || *pbNewTerm==0 );
  if( p->rc==SQLITE_OK ){
    if( pIter->flags & FTS5_SEGITER_REVERSE ){
      assert( pIter->pNextLeaf==0 );
      if( pIter->iRowidOffset>0 ){
        u8 *a = pIter->pLeaf->p;
        int iOff;
        int nPos;
        int bDummy;
        i64 iDelta;

        pIter->iRowidOffset--;
        pIter->iLeafOffset = iOff = pIter->aRowidOffset[pIter->iRowidOffset];
        iOff += fts5GetPoslistSize(&a[iOff], &nPos, &bDummy);
        iOff += nPos;
        fts5GetVarint(&a[iOff], (u64*)&iDelta);
        pIter->iRowid -= iDelta;
        fts5SegIterLoadNPos(p, pIter);
      }else{
        fts5SegIterReverseNewPage(p, pIter);
      }
    }else{
      Fts5Data *pLeaf = pIter->pLeaf;
      int iOff;
      int bNewTerm = 0;
      int nKeep = 0;
  Fts5Data *pLeaf = pIter->pLeaf;
  int iOff;
  int bNewTerm = 0;
  int nKeep = 0;

  assert( pbNewTerm==0 || *pbNewTerm==0 );
  assert( p->pConfig->eDetail!=FTS5_DETAIL_NONE );

      /* Search for the end of the position list within the current page. */
      u8 *a = pLeaf->p;
      int n = pLeaf->szLeaf;
  /* Search for the end of the position list within the current page. */
  u8 *a = pLeaf->p;
  int n = pLeaf->szLeaf;

      ASSERT_SZLEAF_OK(pLeaf);
      iOff = pIter->iLeafOffset + pIter->nPos;
  ASSERT_SZLEAF_OK(pLeaf);
  iOff = pIter->iLeafOffset + pIter->nPos;

      if( iOff<n ){
        /* The next entry is on the current page. */
        assert_nc( iOff<=pIter->iEndofDoclist );
        if( iOff>=pIter->iEndofDoclist ){
          bNewTerm = 1;
          if( iOff!=fts5LeafFirstTermOff(pLeaf) ){
            iOff += fts5GetVarint32(&a[iOff], nKeep);
          }
        }else{
          u64 iDelta;
          iOff += sqlite3Fts5GetVarint(&a[iOff], &iDelta);
          pIter->iRowid += iDelta;
          assert_nc( iDelta>0 );
        }
        pIter->iLeafOffset = iOff;
  if( iOff<n ){
    /* The next entry is on the current page. */
    assert_nc( iOff<=pIter->iEndofDoclist );
    if( iOff>=pIter->iEndofDoclist ){
      bNewTerm = 1;
      if( iOff!=fts5LeafFirstTermOff(pLeaf) ){
        iOff += fts5GetVarint32(&a[iOff], nKeep);
      }
    }else{
      u64 iDelta;
      iOff += sqlite3Fts5GetVarint(&a[iOff], &iDelta);
      pIter->iRowid += iDelta;
      assert_nc( iDelta>0 );
    }
    pIter->iLeafOffset = iOff;

      }else if( pIter->pSeg==0 ){
        const u8 *pList = 0;
        const char *zTerm = 0;
        int nList = 0;
        assert( (pIter->flags & FTS5_SEGITER_ONETERM) || pbNewTerm );
        if( 0==(pIter->flags & FTS5_SEGITER_ONETERM) ){
          sqlite3Fts5HashScanNext(p->pHash);
          sqlite3Fts5HashScanEntry(p->pHash, &zTerm, &pList, &nList);
        }
        if( pList==0 ){
          fts5DataRelease(pIter->pLeaf);
          pIter->pLeaf = 0;
        }else{
          pIter->pLeaf->p = (u8*)pList;
          pIter->pLeaf->nn = nList;
          pIter->pLeaf->szLeaf = nList;
          pIter->iEndofDoclist = nList+1;
          sqlite3Fts5BufferSet(&p->rc, &pIter->term, (int)strlen(zTerm),
              (u8*)zTerm);
          pIter->iLeafOffset = fts5GetVarint(pList, (u64*)&pIter->iRowid);
          *pbNewTerm = 1;
        }
      }else{
        iOff = 0;
        /* Next entry is not on the current page */
        while( iOff==0 ){
          fts5SegIterNextPage(p, pIter);
          pLeaf = pIter->pLeaf;
          if( pLeaf==0 ) break;
          ASSERT_SZLEAF_OK(pLeaf);
          if( (iOff = fts5LeafFirstRowidOff(pLeaf)) && iOff<pLeaf->szLeaf ){
            iOff += sqlite3Fts5GetVarint(&pLeaf->p[iOff], (u64*)&pIter->iRowid);
            pIter->iLeafOffset = iOff;
  }else if( pIter->pSeg==0 ){
    const u8 *pList = 0;
    const char *zTerm = 0;
    int nList = 0;
    assert( (pIter->flags & FTS5_SEGITER_ONETERM) || pbNewTerm );
    if( 0==(pIter->flags & FTS5_SEGITER_ONETERM) ){
      sqlite3Fts5HashScanNext(p->pHash);
      sqlite3Fts5HashScanEntry(p->pHash, &zTerm, &pList, &nList);
    }
    if( pList==0 ){
      fts5DataRelease(pIter->pLeaf);
      pIter->pLeaf = 0;
    }else{
      pIter->pLeaf->p = (u8*)pList;
      pIter->pLeaf->nn = nList;
      pIter->pLeaf->szLeaf = nList;
      pIter->iEndofDoclist = nList+1;
      sqlite3Fts5BufferSet(&p->rc, &pIter->term, (int)strlen(zTerm),
          (u8*)zTerm);
      pIter->iLeafOffset = fts5GetVarint(pList, (u64*)&pIter->iRowid);
      *pbNewTerm = 1;
    }
  }else{
    iOff = 0;
    /* Next entry is not on the current page */
    while( iOff==0 ){
      fts5SegIterNextPage(p, pIter);
      pLeaf = pIter->pLeaf;
      if( pLeaf==0 ) break;
      ASSERT_SZLEAF_OK(pLeaf);
      if( (iOff = fts5LeafFirstRowidOff(pLeaf)) && iOff<pLeaf->szLeaf ){
        iOff += sqlite3Fts5GetVarint(&pLeaf->p[iOff], (u64*)&pIter->iRowid);
        pIter->iLeafOffset = iOff;

            if( pLeaf->nn>pLeaf->szLeaf ){
              pIter->iPgidxOff = pLeaf->szLeaf + fts5GetVarint32(
                  &pLeaf->p[pLeaf->szLeaf], pIter->iEndofDoclist
        if( pLeaf->nn>pLeaf->szLeaf ){
          pIter->iPgidxOff = pLeaf->szLeaf + fts5GetVarint32(
              &pLeaf->p[pLeaf->szLeaf], pIter->iEndofDoclist
              );
            }
        }

          }
          else if( pLeaf->nn>pLeaf->szLeaf ){
            pIter->iPgidxOff = pLeaf->szLeaf + fts5GetVarint32(
                &pLeaf->p[pLeaf->szLeaf], iOff
      }
      else if( pLeaf->nn>pLeaf->szLeaf ){
        pIter->iPgidxOff = pLeaf->szLeaf + fts5GetVarint32(
            &pLeaf->p[pLeaf->szLeaf], iOff
            );
            pIter->iLeafOffset = iOff;
            pIter->iEndofDoclist = iOff;
            bNewTerm = 1;
          }
          if( iOff>=pLeaf->szLeaf ){
            p->rc = FTS5_CORRUPT;
            return;
          }
        }
      }
        pIter->iLeafOffset = iOff;
        pIter->iEndofDoclist = iOff;
        bNewTerm = 1;
      }
      assert_nc( iOff<pLeaf->szLeaf );
      if( iOff>pLeaf->szLeaf ){
        p->rc = FTS5_CORRUPT;
        return;
      }
    }
  }

      /* Check if the iterator is now at EOF. If so, return early. */
      if( pIter->pLeaf ){
        if( bNewTerm ){
          if( pIter->flags & FTS5_SEGITER_ONETERM ){
            fts5DataRelease(pIter->pLeaf);
            pIter->pLeaf = 0;
          }else{
            fts5SegIterLoadTerm(p, pIter, nKeep);
            fts5SegIterLoadNPos(p, pIter);
            if( pbNewTerm ) *pbNewTerm = 1;
          }
        }else{
          /* The following could be done by calling fts5SegIterLoadNPos(). But
          ** this block is particularly performance critical, so equivalent
          ** code is inlined. */
          int nSz;
          assert( p->rc==SQLITE_OK );
          fts5FastGetVarint32(pIter->pLeaf->p, pIter->iLeafOffset, nSz);
          pIter->bDel = (nSz & 0x0001);
          pIter->nPos = nSz>>1;
          assert_nc( pIter->nPos>=0 );
  /* Check if the iterator is now at EOF. If so, return early. */
  if( pIter->pLeaf ){
    if( bNewTerm ){
      if( pIter->flags & FTS5_SEGITER_ONETERM ){
        fts5DataRelease(pIter->pLeaf);
        pIter->pLeaf = 0;
      }else{
        fts5SegIterLoadTerm(p, pIter, nKeep);
        fts5SegIterLoadNPos(p, pIter);
        if( pbNewTerm ) *pbNewTerm = 1;
      }
    }else{
      /* The following could be done by calling fts5SegIterLoadNPos(). But
      ** this block is particularly performance critical, so equivalent
      ** code is inlined. 
      **
      ** Later: Switched back to fts5SegIterLoadNPos() because it supports
      ** detail=none mode. Not ideal.
      */
      int nSz;
      assert( p->rc==SQLITE_OK );
      fts5FastGetVarint32(pIter->pLeaf->p, pIter->iLeafOffset, nSz);
      pIter->bDel = (nSz & 0x0001);
      pIter->nPos = nSz>>1;
      assert_nc( pIter->nPos>=0 );
        }
      }
    }
  }
}

#define SWAPVAL(T, a, b) { T tmp; tmp=a; a=b; b=tmp; }

#define fts5IndexSkipVarint(a, iOff) {            \
  int iEnd = iOff+9;                              \
  while( (a[iOff++] & 0x80) && iOff<iEnd );       \
}

/*
** Iterator pIter currently points to the first rowid in a doclist. This
** function sets the iterator up so that iterates in reverse order through
** the doclist.
*/
static void fts5SegIterReverse(Fts5Index *p, Fts5SegIter *pIter){
  int eDetail = p->pConfig->eDetail;
  Fts5DlidxIter *pDlidx = pIter->pDlidx;
  Fts5Data *pLast = 0;
  int pgnoLast = 0;

  if( pDlidx ){
    int iSegid = pIter->pSeg->iSegid;
    pgnoLast = fts5DlidxIterPgno(pDlidx);
    pLast = fts5DataRead(p, FTS5_SEGMENT_ROWID(iSegid, pgnoLast));
  }else{
    Fts5Data *pLeaf = pIter->pLeaf;         /* Current leaf data */

    /* Currently, Fts5SegIter.iLeafOffset points to the first byte of
    ** position-list content for the current rowid. Back it up so that it
    ** points to the start of the position-list size field. */
#if 0
    if( eDetail!=FTS5_DETAIL_NONE ){
    pIter->iLeafOffset -= sqlite3Fts5GetVarintLen(pIter->nPos*2+pIter->bDel);
      pIter->iLeafOffset -= sqlite3Fts5GetVarintLen(pIter->nPos*2+pIter->bDel);
    }
#else
    int iPoslist;
    if( pIter->iTermLeafPgno==pIter->iLeafPgno ){
      iPoslist = pIter->iTermLeafOffset;
    }else{
      iPoslist = 4;
    }
    fts5IndexSkipVarint(pLeaf->p, iPoslist);
    assert( eDetail==FTS5_DETAIL_NONE || iPoslist==(
        pIter->iLeafOffset - sqlite3Fts5GetVarintLen(pIter->nPos*2+pIter->bDel)
    ));
    pIter->iLeafOffset = iPoslist;
#endif

    /* If this condition is true then the largest rowid for the current
    ** term may not be stored on the current page. So search forward to
    ** see where said rowid really is.  */
    if( pIter->iEndofDoclist>=pLeaf->szLeaf ){
      int pgno;
      Fts5StructureSegment *pSeg = pIter->pSeg;

  ){
    return;
  }

  pIter->pDlidx = fts5DlidxIterInit(p, bRev, iSeg, pIter->iTermLeafPgno);
}

#define fts5IndexSkipVarint(a, iOff) {            \
  int iEnd = iOff+9;                              \
  while( (a[iOff++] & 0x80) && iOff<iEnd );       \
}

/*
** The iterator object passed as the second argument currently contains
** no valid values except for the Fts5SegIter.pLeaf member variable. This
** function searches the leaf page for a term matching (pTerm/nTerm).
**
** If the specified term is found on the page, then the iterator is left
** pointing to it. If argument bGe is zero and the term is not found,

      }
      if( flags & FTS5INDEX_QUERY_DESC ){
        fts5SegIterReverse(p, pIter);
      }
    }
  }

  fts5SegIterSetNext(p, pIter);

  /* Either:
  **
  **   1) an error has occurred, or
  **   2) the iterator points to EOF, or
  **   3) the iterator points to an entry with term (pTerm/nTerm), or
  **   4) the FTS5INDEX_QUERY_SCAN flag was set and the iterator points
  **      to an entry with a term greater than or equal to (pTerm/nTerm).

    sqlite3Fts5BufferSet(&p->rc, &pIter->term, n, z);
    pLeaf = fts5IdxMalloc(p, sizeof(Fts5Data));
    if( pLeaf==0 ) return;
    pLeaf->p = (u8*)pList;
    pLeaf->nn = pLeaf->szLeaf = nList;
    pIter->pLeaf = pLeaf;
    pIter->iLeafOffset = fts5GetVarint(pLeaf->p, (u64*)&pIter->iRowid);
    pIter->iEndofDoclist = pLeaf->nn+1;
    pIter->iEndofDoclist = pLeaf->nn;

    if( flags & FTS5INDEX_QUERY_DESC ){
      pIter->flags |= FTS5_SEGITER_REVERSE;
      fts5SegIterReverseInitPage(p, pIter);
    }else{
      fts5SegIterLoadNPos(p, pIter);
    }
  }

  fts5SegIterSetNext(p, pIter);
}

/*
** Zero the iterator passed as the only argument.
*/
static void fts5SegIterClear(Fts5SegIter *pIter){
  fts5BufferFree(&pIter->term);

      pIter->iLeafPgno = iLeafPgno+1;
      fts5SegIterReverseNewPage(p, pIter);
      bMove = 0;
    }
  }

  do{
    if( bMove ) fts5SegIterNext(p, pIter, 0);
    if( bMove && p->rc==SQLITE_OK ) pIter->xNext(p, pIter, 0);
    if( pIter->pLeaf==0 ) break;
    if( bRev==0 && pIter->iRowid>=iMatch ) break;
    if( bRev!=0 && pIter->iRowid<=iMatch ) break;
    bMove = 1;
  }while( p->rc==SQLITE_OK );
}

  int iChanged,                   /* Index of sub-iterator just advanced */
  int iMinset                     /* Minimum entry in aFirst[] to set */
){
  int i;
  for(i=(pIter->nSeg+iChanged)/2; i>=iMinset && p->rc==SQLITE_OK; i=i/2){
    int iEq;
    if( (iEq = fts5MultiIterDoCompare(pIter, i)) ){
      fts5SegIterNext(p, &pIter->aSeg[iEq], 0);
      Fts5SegIter *pSeg = &pIter->aSeg[iEq];
      assert( p->rc==SQLITE_OK );
      pSeg->xNext(p, pSeg, 0);
      i = pIter->nSeg + iEq;
    }
  }
}

/*
** Sub-iterator iChanged of iterator pIter has just been advanced. It still

      int iFirst = pIter->aFirst[1].iFirst;
      int bNewTerm = 0;
      Fts5SegIter *pSeg = &pIter->aSeg[iFirst];
      assert( p->rc==SQLITE_OK );
      if( bUseFrom && pSeg->pDlidx ){
        fts5SegIterNextFrom(p, pSeg, iFrom);
      }else{
        fts5SegIterNext(p, pSeg, &bNewTerm);
        pSeg->xNext(p, pSeg, &bNewTerm);
      }

      if( pSeg->pLeaf==0 || bNewTerm 
       || fts5MultiIterAdvanceRowid(p, pIter, iFirst)
      ){
        fts5MultiIterAdvanced(p, pIter, iFirst, 1);
        fts5MultiIterSetEof(pIter);

  assert( pIter->bSkipEmpty );
  if( p->rc==SQLITE_OK ){
    do {
      int iFirst = pIter->aFirst[1].iFirst;
      Fts5SegIter *pSeg = &pIter->aSeg[iFirst];
      int bNewTerm = 0;

      assert( p->rc==SQLITE_OK );
      fts5SegIterNext(p, pSeg, &bNewTerm);
      pSeg->xNext(p, pSeg, &bNewTerm);
      if( pSeg->pLeaf==0 || bNewTerm 
       || fts5MultiIterAdvanceRowid(p, pIter, iFirst)
      ){
        fts5MultiIterAdvanced(p, pIter, iFirst, 1);
        fts5MultiIterSetEof(pIter);
        *pbNewTerm = 1;
      }else{

  ** to the first entry in its segment. In this case initialize the 
  ** aFirst[] array. Or, if an error has occurred, free the iterator
  ** object and set the output variable to NULL.  */
  if( p->rc==SQLITE_OK ){
    for(iIter=pNew->nSeg-1; iIter>0; iIter--){
      int iEq;
      if( (iEq = fts5MultiIterDoCompare(pNew, iIter)) ){
        fts5SegIterNext(p, &pNew->aSeg[iEq], 0);
        Fts5SegIter *pSeg = &pNew->aSeg[iEq];
        if( p->rc==SQLITE_OK ) pSeg->xNext(p, pSeg, 0);
        fts5MultiIterAdvanced(p, pNew, iEq, iIter);
      }
    }
    fts5MultiIterSetEof(pNew);
    fts5AssertMultiIterSetup(p, pNew);

    if( pNew->bSkipEmpty && fts5MultiIterIsEmpty(p, pNew) ){

      }else{
        fts5SegIterLoadNPos(p, pIter);
      }
      pData = 0;
    }else{
      pNew->bEof = 1;
    }
    fts5SegIterSetNext(p, pIter);

    *ppOut = pNew;
  }

  fts5DataRelease(pData);
}

){
  int nRem = pSeg->nPos;          /* Number of bytes still to come */
  Fts5Data *pData = 0;
  u8 *pChunk = &pSeg->pLeaf->p[pSeg->iLeafOffset];
  int nChunk = MIN(nRem, pSeg->pLeaf->szLeaf - pSeg->iLeafOffset);
  int pgno = pSeg->iLeafPgno;
  int pgnoSave = 0;

  /* This function does notmwork with detail=none databases. */
  assert( p->pConfig->eDetail!=FTS5_DETAIL_NONE );

  if( (pSeg->flags & FTS5_SEGITER_REVERSE)==0 ){
    pgnoSave = pgno+1;
  }

  while( 1 ){
    xChunk(p, pCtx, pChunk, nChunk);

/*
** Append a rowid and position-list size field to the writers output. 
*/
static void fts5WriteAppendRowid(
  Fts5Index *p, 
  Fts5SegWriter *pWriter,
  i64 iRowid,
  i64 iRowid
  int nPos
){
  if( p->rc==SQLITE_OK ){
    Fts5PageWriter *pPage = &pWriter->writer;

    if( (pPage->buf.n + pPage->pgidx.n)>=p->pConfig->pgsz ){
      fts5WriteFlushLeaf(p, pWriter);
    }

    }else{
      assert( p->rc || iRowid>pWriter->iPrevRowid );
      fts5BufferAppendVarint(&p->rc, &pPage->buf, iRowid - pWriter->iPrevRowid);
    }
    pWriter->iPrevRowid = iRowid;
    pWriter->bFirstRowidInDoclist = 0;
    pWriter->bFirstRowidInPage = 0;

    fts5BufferAppendVarint(&p->rc, &pPage->buf, nPos);
  }
}

static void fts5WriteAppendPoslistData(
  Fts5Index *p, 
  Fts5SegWriter *pWriter, 
  const u8 *aData, 

  Fts5IndexIter *pIter = 0;       /* Iterator to read input data */
  int nRem = pnRem ? *pnRem : 0;  /* Output leaf pages left to write */
  int nInput;                     /* Number of input segments */
  Fts5SegWriter writer;           /* Writer object */
  Fts5StructureSegment *pSeg;     /* Output segment */
  Fts5Buffer term;
  int bOldest;                    /* True if the output segment is the oldest */
  int eDetail = p->pConfig->eDetail;

  assert( iLvl<pStruct->nLevel );
  assert( pLvl->nMerge<=pLvl->nSeg );

  memset(&writer, 0, sizeof(Fts5SegWriter));
  memset(&term, 0, sizeof(Fts5Buffer));
  if( pLvl->nMerge ){

      /* This is a new term. Append a term to the output segment. */
      fts5WriteAppendTerm(p, &writer, nTerm, pTerm);
      fts5BufferSet(&p->rc, &term, nTerm, pTerm);
    }

    /* Append the rowid to the output */
    /* WRITEPOSLISTSIZE */
    nPos = pSegIter->nPos*2 + pSegIter->bDel;
    fts5WriteAppendRowid(p, &writer, fts5MultiIterRowid(pIter), nPos);
    fts5WriteAppendRowid(p, &writer, fts5MultiIterRowid(pIter));

    if( eDetail==FTS5_DETAIL_NONE ){
      if( pSegIter->bDel ){
        fts5BufferAppendVarint(&p->rc, &writer.writer.buf, 0);
        if( pSegIter->nPos>0 ){
          fts5BufferAppendVarint(&p->rc, &writer.writer.buf, 0);
        }
      }
    }else{
    /* Append the position-list data to the output */
    fts5ChunkIterate(p, pSegIter, (void*)&writer, fts5MergeChunkCallback);
      /* Append the position-list data to the output */
      nPos = pSegIter->nPos*2 + pSegIter->bDel;
      fts5BufferAppendVarint(&p->rc, &writer.writer.buf, nPos);
      fts5ChunkIterate(p, pSegIter, (void*)&writer, fts5MergeChunkCallback);
    }
  }

  /* Flush the last leaf page to disk. Set the output segment b-tree height
  ** and last leaf page number at the same time.  */
  fts5WriteFinish(p, &writer, &pSeg->pgnoLast);

  if( fts5MultiIterEof(p, pIter) ){

  /* Obtain a reference to the index structure and allocate a new segment-id
  ** for the new level-0 segment.  */
  pStruct = fts5StructureRead(p);
  iSegid = fts5AllocateSegid(p, pStruct);

  if( iSegid ){
    const int pgsz = p->pConfig->pgsz;

    int eDetail = p->pConfig->eDetail;
    Fts5StructureSegment *pSeg;   /* New segment within pStruct */
    Fts5Buffer *pBuf;             /* Buffer in which to assemble leaf page */
    Fts5Buffer *pPgidx;           /* Buffer in which to assemble pgidx */

    Fts5SegWriter writer;
    fts5WriteInit(p, &writer, iSegid);

        i64 iDelta = 0;
        int iOff = 0;

        /* The entire doclist will not fit on this leaf. The following 
        ** loop iterates through the poslists that make up the current 
        ** doclist.  */
        while( p->rc==SQLITE_OK && iOff<nDoclist ){
          int nPos;
          int nCopy;
          int bDummy;
          iOff += fts5GetVarint(&pDoclist[iOff], (u64*)&iDelta);
          nCopy = fts5GetPoslistSize(&pDoclist[iOff], &nPos, &bDummy);
          nCopy += nPos;
          iRowid += iDelta;
          
          if( writer.bFirstRowidInPage ){
            fts5PutU16(&pBuf->p[0], (u16)pBuf->n);   /* first rowid on page */
            pBuf->n += sqlite3Fts5PutVarint(&pBuf->p[pBuf->n], iRowid);
            writer.bFirstRowidInPage = 0;
            fts5WriteDlidxAppend(p, &writer, iRowid);
          }else{
            pBuf->n += sqlite3Fts5PutVarint(&pBuf->p[pBuf->n], iDelta);
          }
          assert( pBuf->n<=pBuf->nSpace );

          if( eDetail==FTS5_DETAIL_NONE ){
            if( iOff<nDoclist && pDoclist[iOff]==0 ){
              pBuf->p[pBuf->n++] = 0;
              iOff++;
              if( iOff<nDoclist && pDoclist[iOff]==0 ){
                pBuf->p[pBuf->n++] = 0;
                iOff++;
              }
            }
            if( (pBuf->n + pPgidx->n)>=pgsz ){
              fts5WriteFlushLeaf(p, &writer);
            }
          }else{
            int bDummy;
            int nPos;
            int nCopy = fts5GetPoslistSize(&pDoclist[iOff], &nPos, &bDummy);
            nCopy += nPos;
          if( (pBuf->n + pPgidx->n + nCopy) <= pgsz ){
            /* The entire poslist will fit on the current leaf. So copy
            ** it in one go. */
            fts5BufferSafeAppendBlob(pBuf, &pDoclist[iOff], nCopy);
          }else{
            /* The entire poslist will not fit on this leaf. So it needs
            ** to be broken into sections. The only qualification being
            ** that each varint must be stored contiguously.  */
            const u8 *pPoslist = &pDoclist[iOff];
            int iPos = 0;
            while( p->rc==SQLITE_OK ){
              int nSpace = pgsz - pBuf->n - pPgidx->n;
              int n = 0;
              if( (nCopy - iPos)<=nSpace ){
                n = nCopy - iPos;
              }else{
                n = fts5PoslistPrefix(&pPoslist[iPos], nSpace);
              }
              assert( n>0 );
              fts5BufferSafeAppendBlob(pBuf, &pPoslist[iPos], n);
              iPos += n;
              if( (pBuf->n + pPgidx->n)>=pgsz ){
                fts5WriteFlushLeaf(p, &writer);
              }
              if( iPos>=nCopy ) break;
            }
          }
          iOff += nCopy;
            if( (pBuf->n + pPgidx->n + nCopy) <= pgsz ){
              /* The entire poslist will fit on the current leaf. So copy
              ** it in one go. */
              fts5BufferSafeAppendBlob(pBuf, &pDoclist[iOff], nCopy);
            }else{
              /* The entire poslist will not fit on this leaf. So it needs
              ** to be broken into sections. The only qualification being
              ** that each varint must be stored contiguously.  */
              const u8 *pPoslist = &pDoclist[iOff];
              int iPos = 0;
              while( p->rc==SQLITE_OK ){
                int nSpace = pgsz - pBuf->n - pPgidx->n;
                int n = 0;
                if( (nCopy - iPos)<=nSpace ){
                  n = nCopy - iPos;
                }else{
                  n = fts5PoslistPrefix(&pPoslist[iPos], nSpace);
                }
                assert( n>0 );
                fts5BufferSafeAppendBlob(pBuf, &pPoslist[iPos], n);
                iPos += n;
                if( (pBuf->n + pPgidx->n)>=pgsz ){
                  fts5WriteFlushLeaf(p, &writer);
                }
                if( iPos>=nCopy ) break;
              }
            }
            iOff += nCopy;
          }
        }
      }

      /* TODO2: Doclist terminator written here. */
      /* pBuf->p[pBuf->n++] = '\0'; */
      assert( pBuf->n<=pBuf->nSpace );
      sqlite3Fts5HashScanNext(pHash);

typedef struct PoslistCallbackCtx PoslistCallbackCtx;
struct PoslistCallbackCtx {
  Fts5Buffer *pBuf;               /* Append to this buffer */
  Fts5Colset *pColset;            /* Restrict matches to this column */
  int eState;                     /* See above */
};

typedef struct PoslistOffsetsCtx PoslistOffsetsCtx;
struct PoslistOffsetsCtx {
  Fts5Buffer *pBuf;               /* Append to this buffer */
  Fts5Colset *pColset;            /* Restrict matches to this column */
  int iRead;
  int iWrite;
};

/*
** TODO: Make this more efficient!
*/
static int fts5IndexColsetTest(Fts5Colset *pColset, int iCol){
  int i;
  for(i=0; i<pColset->nCol; i++){
    if( pColset->aiCol[i]==iCol ) return 1;
  }
  return 0;
}

static void fts5PoslistOffsetsCallback(
  Fts5Index *p, 
  void *pContext, 
  const u8 *pChunk, int nChunk
){
  PoslistOffsetsCtx *pCtx = (PoslistOffsetsCtx*)pContext;
  assert_nc( nChunk>=0 );
  if( nChunk>0 ){
    int i = 0;
    while( i<nChunk ){
      int iVal;
      i += fts5GetVarint32(&pChunk[i], iVal);
      iVal += pCtx->iRead - 2;
      pCtx->iRead = iVal;
      if( fts5IndexColsetTest(pCtx->pColset, iVal) ){
        fts5BufferSafeAppendVarint(pCtx->pBuf, iVal + 2 - pCtx->iWrite);
        pCtx->iWrite = iVal;
      }
    }
  }
}

static void fts5PoslistFilterCallback(
  Fts5Index *p, 
  void *pContext, 
  const u8 *pChunk, int nChunk
){
  PoslistCallbackCtx *pCtx = (PoslistCallbackCtx*)pContext;

  Fts5Colset *pColset,
  Fts5Buffer *pBuf
){
  if( 0==fts5BufferGrow(&p->rc, pBuf, pSeg->nPos) ){
    if( pColset==0 ){
      fts5ChunkIterate(p, pSeg, (void*)pBuf, fts5PoslistCallback);
    }else{
      if( p->pConfig->eDetail==FTS5_DETAIL_FULL ){
      PoslistCallbackCtx sCtx;
      sCtx.pBuf = pBuf;
      sCtx.pColset = pColset;
      sCtx.eState = fts5IndexColsetTest(pColset, 0);
      assert( sCtx.eState==0 || sCtx.eState==1 );
      fts5ChunkIterate(p, pSeg, (void*)&sCtx, fts5PoslistFilterCallback);
        PoslistCallbackCtx sCtx;
        sCtx.pBuf = pBuf;
        sCtx.pColset = pColset;
        sCtx.eState = fts5IndexColsetTest(pColset, 0);
        assert( sCtx.eState==0 || sCtx.eState==1 );
        fts5ChunkIterate(p, pSeg, (void*)&sCtx, fts5PoslistFilterCallback);
      }else{
        PoslistOffsetsCtx sCtx;
        memset(&sCtx, 0, sizeof(sCtx));
        sCtx.pBuf = pBuf;
        sCtx.pColset = pColset;
        fts5ChunkIterate(p, pSeg, (void*)&sCtx, fts5PoslistOffsetsCallback);
      }
    }
  }
}

/*
** IN/OUT parameter (*pa) points to a position list n bytes in size. If
** the position list contains entries for column iCol, then (*pa) is set

  assert( (prev & 0x80)==0 );
  while( p<pEnd && ((prev & 0x80) || *p!=0x01) ){
    prev = *p++;
  }
  return p - (*pa);
}

static int fts5AppendRowid(
  Fts5Index *p,
  i64 iDelta,
  Fts5IndexIter *pMulti,
  Fts5Colset *pColset,
  Fts5Buffer *pBuf
){
  fts5BufferAppendVarint(&p->rc, pBuf, iDelta);
  return 0;
}

/*
** Iterator pMulti currently points to a valid entry (not EOF). This
** function appends the following to buffer pBuf:
**
**   * The varint iDelta, and
**   * the position list that currently points to, including the size field.

  Fts5Buffer *pBuf
){
  if( p->rc==SQLITE_OK ){
    Fts5SegIter *pSeg = &pMulti->aSeg[ pMulti->aFirst[1].iFirst ];
    assert( fts5MultiIterEof(p, pMulti)==0 );
    assert( pSeg->nPos>0 );
    if( 0==fts5BufferGrow(&p->rc, pBuf, pSeg->nPos+9+9) ){

      if( pSeg->iLeafOffset+pSeg->nPos<=pSeg->pLeaf->szLeaf 
      if( p->pConfig->eDetail==FTS5_DETAIL_FULL
       && pSeg->iLeafOffset+pSeg->nPos<=pSeg->pLeaf->szLeaf 
       && (pColset==0 || pColset->nCol==1)
      ){
        const u8 *pPos = &pSeg->pLeaf->p[pSeg->iLeafOffset];
        int nPos;
        if( pColset ){
          nPos = fts5IndexExtractCol(&pPos, pSeg->nPos, pColset->aiCol[0]);
          if( nPos==0 ) return 1;

              int nReq = sqlite3Fts5GetVarintLen((u32)(nActual*2));
              while( iSv2<(iData-nReq) ){ pBuf->p[iSv2++] = 0x80; }
              sqlite3Fts5PutVarint(&pBuf->p[iSv2], nActual*2);
            }
          }
        }
      }

    }
  }

  return 0;
}


static void fts5DoclistIterNext(Fts5DoclistIter *pIter){
  u8 *p = pIter->aPoslist + pIter->nSize + pIter->nPoslist;

  assert( pIter->aPoslist );
  if( p>=pIter->aEof ){
    pIter->aPoslist = 0;

#endif

#define fts5MergeAppendDocid(pBuf, iLastRowid, iRowid) {       \
  assert( (pBuf)->n!=0 || (iLastRowid)==0 );                   \
  fts5BufferSafeAppendVarint((pBuf), (iRowid) - (iLastRowid)); \
  (iLastRowid) = (iRowid);                                     \
}

/*
** Swap the contents of buffer *p1 with that of *p2.
*/
static void fts5BufferSwap(Fts5Buffer *p1, Fts5Buffer *p2){
  Fts5Buffer tmp = *p1;
  *p1 = *p2;
  *p2 = tmp;
}

static void fts5NextRowid(Fts5Buffer *pBuf, int *piOff, i64 *piRowid){
  int i = *piOff;
  if( i>=pBuf->n ){
    *piOff = -1;
  }else{
    u64 iVal;
    *piOff = i + sqlite3Fts5GetVarint(&pBuf->p[i], &iVal);
    *piRowid += iVal;
  }
}

/*
** This is the equivalent of fts5MergePrefixLists() for detail=none mode.
** In this case the buffers consist of a delta-encoded list of rowids only.
*/
static void fts5MergeRowidLists(
  Fts5Index *p,                   /* FTS5 backend object */
  Fts5Buffer *p1,                 /* First list to merge */
  Fts5Buffer *p2                  /* Second list to merge */
){
  int i1 = 0;
  int i2 = 0;
  i64 iRowid1 = 0;
  i64 iRowid2 = 0;
  i64 iOut = 0;

  Fts5Buffer out;
  memset(&out, 0, sizeof(out));
  sqlite3Fts5BufferSize(&p->rc, &out, p1->n + p2->n);
  if( p->rc ) return;

  fts5NextRowid(p1, &i1, &iRowid1);
  fts5NextRowid(p2, &i2, &iRowid2);
  while( i1>=0 || i2>=0 ){
    if( i1>=0 && (i2<0 || iRowid1<iRowid2) ){
      assert( iOut==0 || iRowid1>iOut );
      fts5BufferSafeAppendVarint(&out, iRowid1 - iOut);
      iOut = iRowid1;
      fts5NextRowid(p1, &i1, &iRowid1);
    }else{
      assert( iOut==0 || iRowid2>iOut );
      fts5BufferSafeAppendVarint(&out, iRowid2 - iOut);
      iOut = iRowid2;
      if( i1>=0 && iRowid1==iRowid2 ){
        fts5NextRowid(p1, &i1, &iRowid1);
      }
      fts5NextRowid(p2, &i2, &iRowid2);
    }
  }

  fts5BufferSwap(&out, p1);
  fts5BufferFree(&out);
}

/*
** Buffers p1 and p2 contain doclists. This function merges the content
** of the two doclists together and sets buffer p1 to the result before
** returning.
**
** If an error occurs, an error code is left in p->rc. If an error has

          }else{
            iNew = iPos2;
            sqlite3Fts5PoslistNext64(a2, i2.nPoslist, &iOff2, &iPos2);
            if( iPos1==iPos2 ){
              sqlite3Fts5PoslistNext64(a1, i1.nPoslist, &iOff1,&iPos1);
            }
          }
          if( iNew!=writer.iPrev || tmp.n==0 ){
          p->rc = sqlite3Fts5PoslistWriterAppend(&tmp, &writer, iNew);
            p->rc = sqlite3Fts5PoslistWriterAppend(&tmp, &writer, iNew);
          }
        }

        /* WRITEPOSLISTSIZE */
        fts5BufferSafeAppendVarint(&out, tmp.n * 2);
        fts5BufferSafeAppendBlob(&out, tmp.p, tmp.n);
        fts5DoclistIterNext(&i1);
        fts5DoclistIterNext(&i2);
      }
    }

    fts5BufferSet(&p->rc, p1, out.n, out.p);
    fts5BufferFree(&tmp);
    fts5BufferFree(&out);
  }
}

static void fts5BufferSwap(Fts5Buffer *p1, Fts5Buffer *p2){
  Fts5Buffer tmp = *p1;
  *p1 = *p2;
  *p2 = tmp;
}

static void fts5SetupPrefixIter(
  Fts5Index *p,                   /* Index to read from */
  int bDesc,                      /* True for "ORDER BY rowid DESC" */
  const u8 *pToken,               /* Buffer containing prefix to match */
  int nToken,                     /* Size of buffer pToken in bytes */
  Fts5Colset *pColset,            /* Restrict matches to these columns */
  Fts5IndexIter **ppIter          /* OUT: New iterator */
){
  Fts5Structure *pStruct;
  Fts5Buffer *aBuf;
  const int nBuf = 32;

  void (*xMerge)(Fts5Index*, Fts5Buffer*, Fts5Buffer*);
  int (*xAppend)(Fts5Index*, i64, Fts5IndexIter*, Fts5Colset*, Fts5Buffer*);
  if( p->pConfig->eDetail==FTS5_DETAIL_NONE ){
    xMerge = fts5MergeRowidLists;
    xAppend = fts5AppendRowid;
  }else{
    xMerge = fts5MergePrefixLists;
    xAppend = fts5AppendPoslist;
  }

  aBuf = (Fts5Buffer*)fts5IdxMalloc(p, sizeof(Fts5Buffer)*nBuf);
  pStruct = fts5StructureRead(p);

  if( aBuf && pStruct ){
    const int flags = FTS5INDEX_QUERY_SCAN;
    int i;

      if( doclist.n>0 && iRowid<=iLastRowid ){
        for(i=0; p->rc==SQLITE_OK && doclist.n; i++){
          assert( i<nBuf );
          if( aBuf[i].n==0 ){
            fts5BufferSwap(&doclist, &aBuf[i]);
            fts5BufferZero(&doclist);
          }else{
            fts5MergePrefixLists(p, &doclist, &aBuf[i]);
            xMerge(p, &doclist, &aBuf[i]);
            fts5BufferZero(&aBuf[i]);
          }
        }
        iLastRowid = 0;
      }

      if( !fts5AppendPoslist(p, iRowid-iLastRowid, p1, pColset, &doclist) ){
      if( !xAppend(p, iRowid-iLastRowid, p1, pColset, &doclist) ){
        iLastRowid = iRowid;
      }
    }

    for(i=0; i<nBuf; i++){
      if( p->rc==SQLITE_OK ){
        fts5MergePrefixLists(p, &doclist, &aBuf[i]);
        xMerge(p, &doclist, &aBuf[i]);
      }
      fts5BufferFree(&aBuf[i]);
    }
    fts5MultiIterFree(p, p1);

    pData = fts5IdxMalloc(p, sizeof(Fts5Data) + doclist.n);
    if( pData ){

** to the document with rowid iRowid.
*/
int sqlite3Fts5IndexBeginWrite(Fts5Index *p, int bDelete, i64 iRowid){
  assert( p->rc==SQLITE_OK );

  /* Allocate the hash table if it has not already been allocated */
  if( p->pHash==0 ){
    p->rc = sqlite3Fts5HashNew(&p->pHash, &p->nPendingData);
    p->rc = sqlite3Fts5HashNew(p->pConfig, &p->pHash, &p->nPendingData);
  }

  /* Flush the hash table to disk if required */
  if( iRowid<p->iWriteRowid 
   || (iRowid==p->iWriteRowid && p->bDelete==0)
   || (p->nPendingData > p->pConfig->nHashSize) 
  ){

}

/*
** Argument p points to a buffer containing utf-8 text that is n bytes in 
** size. Return the number of bytes in the nChar character prefix of the
** buffer, or 0 if there are less than nChar characters in total.
*/
static int fts5IndexCharlenToBytelen(const char *p, int nByte, int nChar){
static int sqlite3Fts5IndexCharlenToBytelen(
  const char *p, 
  int nByte, 
  int nChar
){
  int n = 0;
  int i;
  for(i=0; i<nChar; i++){
    if( n>=nByte ) return 0;      /* Input contains fewer than nChar chars */
    if( (unsigned char)p[n++]>=0xc0 ){
      while( (p[n] & 0xc0)==0x80 ) n++;
    }

  /* Add the entry to the main terms index. */
  rc = sqlite3Fts5HashWrite(
      p->pHash, p->iWriteRowid, iCol, iPos, FTS5_MAIN_PREFIX, pToken, nToken
  );

  for(i=0; i<pConfig->nPrefix && rc==SQLITE_OK; i++){
    const int nChar = pConfig->aPrefix[i];
    int nByte = fts5IndexCharlenToBytelen(pToken, nToken, pConfig->aPrefix[i]);
    int nByte = sqlite3Fts5IndexCharlenToBytelen(pToken, nToken, nChar);
    if( nByte ){
      rc = sqlite3Fts5HashWrite(p->pHash, 
          p->iWriteRowid, iCol, iPos, (char)(FTS5_MAIN_PREFIX+i+1), pToken,
          nByte
      );
    }
  }

  Fts5IndexIter *pIter, 
  Fts5Colset *pColset,            /* Column filter (or NULL) */
  const u8 **pp,                  /* OUT: Pointer to position-list data */
  int *pn,                        /* OUT: Size of position-list in bytes */
  i64 *piRowid                    /* OUT: Current rowid */
){
  Fts5SegIter *pSeg = &pIter->aSeg[ pIter->aFirst[1].iFirst ];
  int eDetail = pIter->pIndex->pConfig->eDetail;

  assert( pIter->pIndex->rc==SQLITE_OK );
  *piRowid = pSeg->iRowid;
  if( eDetail==FTS5_DETAIL_NONE ){
    *pn = pSeg->nPos;
  }else
  if( eDetail==FTS5_DETAIL_FULL 
  if( pSeg->iLeafOffset+pSeg->nPos<=pSeg->pLeaf->szLeaf ){
   && pSeg->iLeafOffset+pSeg->nPos<=pSeg->pLeaf->szLeaf 
  ){
    u8 *pPos = &pSeg->pLeaf->p[pSeg->iLeafOffset];
    if( pColset==0 || pIter->bFiltered ){
      *pn = pSeg->nPos;
      *pp = pPos;
    }else if( pColset->nCol==1 ){
      *pp = pPos;
      *pn = fts5IndexExtractCol(pp, pSeg->nPos, pColset->aiCol[0]);
    }else{
      fts5BufferZero(&pIter->poslist);
      fts5IndexExtractColset(pColset, pPos, pSeg->nPos, &pIter->poslist);
      *pp = pIter->poslist.p;
      *pn = pIter->poslist.n;
    }
  }else{
    fts5BufferZero(&pIter->poslist);
    fts5SegiterPoslist(pIter->pIndex, pSeg, pColset, &pIter->poslist);
    if( eDetail==FTS5_DETAIL_FULL ){
    *pp = pIter->poslist.p;
      *pp = pIter->poslist.p;
    }
    *pn = pIter->poslist.n;
  }
  return fts5IndexReturn(pIter->pIndex);
}

int sqlite3Fts5IterCollist(
  Fts5IndexIter *pIter, 
  const u8 **pp,                  /* OUT: Pointer to position-list data */
  int *pn                         /* OUT: Size of position-list in bytes */
){
  assert( pIter->pIndex->pConfig->eDetail==FTS5_DETAIL_COLUMNS );
  *pp = pIter->poslist.p;
  *pn = pIter->poslist.n;
  return SQLITE_OK;
}

/*
** This function is similar to sqlite3Fts5IterPoslist(), except that it
** copies the position list into the buffer supplied as the second 
** argument.
*/
int sqlite3Fts5IterPoslistBuffer(Fts5IndexIter *pIter, Fts5Buffer *pBuf){

** Below this point is the implementation of the integrity-check 
** functionality.
*/

/*
** Return a simple checksum value based on the arguments.
*/
static u64 fts5IndexEntryCksum(
u64 sqlite3Fts5IndexEntryCksum(
  i64 iRowid, 
  int iCol, 
  int iPos, 
  int iIdx,
  const char *pTerm,
  int nTerm
){

  Fts5Index *p,                   /* Fts5 index object */
  int iIdx,
  const char *z,                  /* Index key to query for */
  int n,                          /* Size of index key in bytes */
  int flags,                      /* Flags for Fts5IndexQuery */
  u64 *pCksum                     /* IN/OUT: Checksum value */
){
  int eDetail = p->pConfig->eDetail;
  u64 cksum = *pCksum;
  Fts5IndexIter *pIdxIter = 0;
  Fts5Buffer buf = {0, 0, 0};
  int rc = sqlite3Fts5IndexQuery(p, z, n, flags, 0, &pIdxIter);

  while( rc==SQLITE_OK && 0==sqlite3Fts5IterEof(pIdxIter) ){
    i64 dummy;
    const u8 *pPos;
    int nPos;
    i64 rowid = sqlite3Fts5IterRowid(pIdxIter);

    if( eDetail==FTS5_DETAIL_NONE ){
      cksum ^= sqlite3Fts5IndexEntryCksum(rowid, 0, 0, iIdx, z, n);
    }else{
    rc = sqlite3Fts5IterPoslist(pIdxIter, 0, &pPos, &nPos, &dummy);
    if( rc==SQLITE_OK ){
      Fts5PoslistReader sReader;
      for(sqlite3Fts5PoslistReaderInit(pPos, nPos, &sReader);
          sReader.bEof==0;
          sqlite3Fts5PoslistReaderNext(&sReader)
      ){
        int iCol = FTS5_POS2COLUMN(sReader.iPos);
        int iOff = FTS5_POS2OFFSET(sReader.iPos);
        cksum ^= fts5IndexEntryCksum(rowid, iCol, iOff, iIdx, z, n);
      }
      rc = sqlite3Fts5IterPoslistBuffer(pIdxIter, &buf);
      if( rc==SQLITE_OK ){
        Fts5PoslistReader sReader;
        for(sqlite3Fts5PoslistReaderInit(buf.p, buf.n, &sReader);
            sReader.bEof==0;
            sqlite3Fts5PoslistReaderNext(&sReader)
        ){
          int iCol = FTS5_POS2COLUMN(sReader.iPos);
          int iOff = FTS5_POS2OFFSET(sReader.iPos);
          cksum ^= sqlite3Fts5IndexEntryCksum(rowid, iCol, iOff, iIdx, z, n);
        }
      }
    }
    if( rc==SQLITE_OK ){
      rc = sqlite3Fts5IterNext(pIdxIter);
    }
  }
  sqlite3Fts5IterClose(pIdxIter);
  fts5BufferFree(&buf);

  *pCksum = cksum;
  return rc;
}


/*

#endif
}


/*
** Run internal checks to ensure that the FTS index (a) is internally 
** consistent and (b) contains entries for which the XOR of the checksums
** as calculated by fts5IndexEntryCksum() is cksum.
** as calculated by sqlite3Fts5IndexEntryCksum() is cksum.
**
** Return SQLITE_CORRUPT if any of the internal checks fail, or if the
** checksum does not match. Return SQLITE_OK if all checks pass without
** error, or some other SQLite error code if another error (e.g. OOM)
** occurs.
*/
int sqlite3Fts5IndexIntegrityCheck(Fts5Index *p, u64 cksum){
  int eDetail = p->pConfig->eDetail;
  u64 cksum2 = 0;                 /* Checksum based on contents of indexes */
  Fts5Buffer poslist = {0,0,0};   /* Buffer used to hold a poslist */
  Fts5IndexIter *pIter;           /* Used to iterate through entire index */
  Fts5Structure *pStruct;         /* Index structure */

#ifdef SQLITE_DEBUG
  /* Used by extra internal tests only run if NDEBUG is not defined */

    int iOff = 0;               /* Offset within poslist */
    i64 iRowid = fts5MultiIterRowid(pIter);
    char *z = (char*)fts5MultiIterTerm(pIter, &n);

    /* If this is a new term, query for it. Update cksum3 with the results. */
    fts5TestTerm(p, &term, z, n, cksum2, &cksum3);

    if( eDetail==FTS5_DETAIL_NONE ){
      if( 0==fts5MultiIterIsEmpty(p, pIter) ){
        cksum2 ^= sqlite3Fts5IndexEntryCksum(iRowid, 0, 0, -1, z, n);
      }
    }else{
    poslist.n = 0;
    fts5SegiterPoslist(p, &pIter->aSeg[pIter->aFirst[1].iFirst] , 0, &poslist);
    while( 0==sqlite3Fts5PoslistNext64(poslist.p, poslist.n, &iOff, &iPos) ){
      int iCol = FTS5_POS2COLUMN(iPos);
      int iTokOff = FTS5_POS2OFFSET(iPos);
      cksum2 ^= fts5IndexEntryCksum(iRowid, iCol, iTokOff, -1, z, n);
      poslist.n = 0;
      fts5SegiterPoslist(p, &pIter->aSeg[pIter->aFirst[1].iFirst], 0, &poslist);
      while( 0==sqlite3Fts5PoslistNext64(poslist.p, poslist.n, &iOff, &iPos) ){
        int iCol = FTS5_POS2COLUMN(iPos);
        int iTokOff = FTS5_POS2OFFSET(iPos);
        cksum2 ^= sqlite3Fts5IndexEntryCksum(iRowid, iCol, iTokOff, -1, z, n);
      }
    }
  }
  fts5TestTerm(p, &term, 0, 0, cksum2, &cksum3);

  fts5MultiIterFree(p, pIter);
  if( p->rc==SQLITE_OK && cksum!=cksum2 ) p->rc = FTS5_CORRUPT;

  fts5StructureRelease(pStruct);
#ifdef SQLITE_DEBUG
  fts5BufferFree(&term);
#endif
  fts5BufferFree(&poslist);
  return fts5IndexReturn(p);
}


/*
** Calculate and return a checksum that is the XOR of the index entry
** checksum of all entries that would be generated by the token specified
** by the final 5 arguments.
*/
u64 sqlite3Fts5IndexCksum(
  Fts5Config *pConfig,            /* Configuration object */
  i64 iRowid,                     /* Document term appears in */
  int iCol,                       /* Column term appears in */
  int iPos,                       /* Position term appears in */
  const char *pTerm, int nTerm    /* Term at iPos */
){
  u64 ret = 0;                    /* Return value */
  int iIdx;                       /* For iterating through indexes */

  ret = fts5IndexEntryCksum(iRowid, iCol, iPos, 0, pTerm, nTerm);

  for(iIdx=0; iIdx<pConfig->nPrefix; iIdx++){
    int nByte = fts5IndexCharlenToBytelen(pTerm, nTerm, pConfig->aPrefix[iIdx]);
    if( nByte ){
      ret ^= fts5IndexEntryCksum(iRowid, iCol, iPos, iIdx+1, pTerm, nByte);
    }
  }

  return ret;
}

/*************************************************************************
**************************************************************************
** Below this point is the implementation of the fts5_decode() scalar
** function only.
*/

/*

*/
#define FTS5CSR_REQUIRE_CONTENT   0x01
#define FTS5CSR_REQUIRE_DOCSIZE   0x02
#define FTS5CSR_REQUIRE_INST      0x04
#define FTS5CSR_EOF               0x08
#define FTS5CSR_FREE_ZRANK        0x10
#define FTS5CSR_REQUIRE_RESEEK    0x20
#define FTS5CSR_REQUIRE_POSLIST   0x40

#define BitFlagAllTest(x,y) (((x) & (y))==(y))
#define BitFlagTest(x,y)    (((x) & (y))!=0)


/*
** Macros to Set(), Clear() and Test() cursor flags.

/*
** Return true if pTab is a contentless table.
*/
static int fts5IsContentless(Fts5Table *pTab){
  return pTab->pConfig->eContent==FTS5_CONTENT_NONE;
}

/*
** Return true if pTab is an offsetless table.
*/
static int fts5IsOffsetless(Fts5Table *pTab){
  return pTab->pConfig->eDetail!=FTS5_DETAIL_FULL;
}

/*
** Delete a virtual table handle allocated by fts5InitVtab(). 
*/
static void fts5FreeVtab(Fts5Table *pTab){
  if( pTab ){
    sqlite3Fts5IndexClose(pTab->pIndex);

** specific to the previous row stored by the cursor object.
*/
static void fts5CsrNewrow(Fts5Cursor *pCsr){
  CsrFlagSet(pCsr, 
      FTS5CSR_REQUIRE_CONTENT 
    | FTS5CSR_REQUIRE_DOCSIZE 
    | FTS5CSR_REQUIRE_INST 
    | FTS5CSR_REQUIRE_POSLIST 
  );
}

static void fts5FreeCursorComponents(Fts5Cursor *pCsr){
  Fts5Table *pTab = (Fts5Table*)(pCsr->base.pVtab);
  Fts5Auxdata *pData;
  Fts5Auxdata *pNext;

    int iOff = 0;
    rc = SQLITE_OK;

    pSorter->iRowid = sqlite3_column_int64(pSorter->pStmt, 0);
    nBlob = sqlite3_column_bytes(pSorter->pStmt, 1);
    aBlob = a = sqlite3_column_blob(pSorter->pStmt, 1);

    /* nBlob==0 in detail=none mode. */
    if( nBlob>0 ){
    for(i=0; i<(pSorter->nIdx-1); i++){
      int iVal;
      a += fts5GetVarint32(a, iVal);
      iOff += iVal;
      pSorter->aIdx[i] = iOff;
    }
    pSorter->aIdx[i] = &aBlob[nBlob] - a;

    pSorter->aPoslist = a;
      for(i=0; i<(pSorter->nIdx-1); i++){
        int iVal;
        a += fts5GetVarint32(a, iVal);
        iOff += iVal;
        pSorter->aIdx[i] = iOff;
      }
      pSorter->aIdx[i] = &aBlob[nBlob] - a;
      pSorter->aPoslist = a;
    }

    fts5CsrNewrow(pCsr);
  }

  return rc;
}

    assert( pRowidEq==0 && pRowidLe==0 && pRowidGe==0 && pRank==0 );
    assert( nVal==0 && pMatch==0 && bOrderByRank==0 && bDesc==0 );
    assert( pCsr->iLastRowid==LARGEST_INT64 );
    assert( pCsr->iFirstRowid==SMALLEST_INT64 );
    pCsr->ePlan = FTS5_PLAN_SOURCE;
    pCsr->pExpr = pTab->pSortCsr->pExpr;
    rc = fts5CursorFirst(pTab, pCsr, bDesc);
    sqlite3Fts5ExprClearEof(pCsr->pExpr);
  }else if( pMatch ){
    const char *zExpr = (const char*)sqlite3_value_text(apVal[0]);
    if( zExpr==0 ) zExpr = "";

    rc = fts5CursorParseRank(pConfig, pCsr, pRank);
    if( rc==SQLITE_OK ){
      if( zExpr[0]=='*' ){

  int rc;
  Fts5Table *pTab = (Fts5Table*)pVtab;
  fts5CheckTransactionState(pTab, FTS5_ROLLBACK, 0);
  rc = sqlite3Fts5StorageRollback(pTab->pStorage);
  return rc;
}

static int fts5CsrPoslist(Fts5Cursor*, int, const u8**, int*);

static void *fts5ApiUserData(Fts5Context *pCtx){
  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
  return pCsr->pAux->pUserData;
}

static int fts5ApiColumnCount(Fts5Context *pCtx){
  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;

}

static int fts5ApiPhraseSize(Fts5Context *pCtx, int iPhrase){
  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
  return sqlite3Fts5ExprPhraseSize(pCsr->pExpr, iPhrase);
}

static int fts5ApiColumnText(
  Fts5Context *pCtx, 
  int iCol, 
  const char **pz, 
  int *pn
){
  int rc = SQLITE_OK;
  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
  if( fts5IsContentless((Fts5Table*)(pCsr->base.pVtab)) ){
    *pz = 0;
    *pn = 0;
  }else{
    rc = fts5SeekCursor(pCsr, 0);
    if( rc==SQLITE_OK ){
      *pz = (const char*)sqlite3_column_text(pCsr->pStmt, iCol+1);
      *pn = sqlite3_column_bytes(pCsr->pStmt, iCol+1);
    }
  }
  return rc;
}

static int fts5CsrPoslist(Fts5Cursor *pCsr, int iPhrase, const u8 **pa){
  int n;
  if( pCsr->pSorter ){
static int fts5CsrPoslist(
  Fts5Cursor *pCsr, 
  int iPhrase, 
  const u8 **pa,
  int *pn
){
  Fts5Config *pConfig = ((Fts5Table*)(pCsr->base.pVtab))->pConfig;
  int rc = SQLITE_OK;
  int bLive = (pCsr->pSorter==0);

  if( CsrFlagTest(pCsr, FTS5CSR_REQUIRE_POSLIST) ){

    if( pConfig->eDetail!=FTS5_DETAIL_FULL ){
      Fts5PoslistPopulator *aPopulator;
      int i;
      aPopulator = sqlite3Fts5ExprClearPoslists(pCsr->pExpr, bLive);
      if( aPopulator==0 ) rc = SQLITE_NOMEM;
      for(i=0; i<pConfig->nCol && rc==SQLITE_OK; i++){
        int n; const char *z;
        rc = fts5ApiColumnText((Fts5Context*)pCsr, i, &z, &n);
        if( rc==SQLITE_OK ){
          rc = sqlite3Fts5ExprPopulatePoslists(
              pConfig, pCsr->pExpr, aPopulator, i, z, n
          );
        }
      }
      sqlite3_free(aPopulator);

      if( pCsr->pSorter ){
        sqlite3Fts5ExprCheckPoslists(pCsr->pExpr, pCsr->pSorter->iRowid);
      }
    }
    CsrFlagClear(pCsr, FTS5CSR_REQUIRE_POSLIST);
  }

  if( pCsr->pSorter && pConfig->eDetail==FTS5_DETAIL_FULL ){
    Fts5Sorter *pSorter = pCsr->pSorter;
    int i1 = (iPhrase==0 ? 0 : pSorter->aIdx[iPhrase-1]);
    n = pSorter->aIdx[iPhrase] - i1;
    *pn = pSorter->aIdx[iPhrase] - i1;
    *pa = &pSorter->aPoslist[i1];
  }else{
    n = sqlite3Fts5ExprPoslist(pCsr->pExpr, iPhrase, pa);
    *pn = sqlite3Fts5ExprPoslist(pCsr->pExpr, iPhrase, pa);
  }

  return n;
  return rc;
}

/*
** Ensure that the Fts5Cursor.nInstCount and aInst[] variables are populated
** correctly for the current view. Return SQLITE_OK if successful, or an
** SQLite error code otherwise.
*/

  aIter = pCsr->aInstIter;

  if( aIter ){
    int nInst = 0;                /* Number instances seen so far */
    int i;

    /* Initialize all iterators */
    for(i=0; i<nIter; i++){
    for(i=0; i<nIter && rc==SQLITE_OK; i++){
      const u8 *a;
      int n; 
      int n = fts5CsrPoslist(pCsr, i, &a);
      rc = fts5CsrPoslist(pCsr, i, &a, &n);
      sqlite3Fts5PoslistReaderInit(a, n, &aIter[i]);
    }

    if( rc==SQLITE_OK ){
    while( 1 ){
      int *aInst;
      int iBest = -1;
      for(i=0; i<nIter; i++){
        if( (aIter[i].bEof==0) 
         && (iBest<0 || aIter[i].iPos<aIter[iBest].iPos) 
        ){
          iBest = i;
        }
      }
      if( iBest<0 ) break;
      while( 1 ){
        int *aInst;
        int iBest = -1;
        for(i=0; i<nIter; i++){
          if( (aIter[i].bEof==0) 
              && (iBest<0 || aIter[i].iPos<aIter[iBest].iPos) 
            ){
            iBest = i;
          }
        }
        if( iBest<0 ) break;

      nInst++;
      if( nInst>=pCsr->nInstAlloc ){
        pCsr->nInstAlloc = pCsr->nInstAlloc ? pCsr->nInstAlloc*2 : 32;
        aInst = (int*)sqlite3_realloc(
            pCsr->aInst, pCsr->nInstAlloc*sizeof(int)*3
        );
        if( aInst ){
          pCsr->aInst = aInst;
        }else{
          rc = SQLITE_NOMEM;
          break;
        }
      }
        nInst++;
        if( nInst>=pCsr->nInstAlloc ){
          pCsr->nInstAlloc = pCsr->nInstAlloc ? pCsr->nInstAlloc*2 : 32;
          aInst = (int*)sqlite3_realloc(
              pCsr->aInst, pCsr->nInstAlloc*sizeof(int)*3
              );
          if( aInst ){
            pCsr->aInst = aInst;
          }else{
            rc = SQLITE_NOMEM;
            break;
          }
        }

      aInst = &pCsr->aInst[3 * (nInst-1)];
      aInst[0] = iBest;
      aInst[1] = FTS5_POS2COLUMN(aIter[iBest].iPos);
      aInst[2] = FTS5_POS2OFFSET(aIter[iBest].iPos);
      sqlite3Fts5PoslistReaderNext(&aIter[iBest]);
        aInst = &pCsr->aInst[3 * (nInst-1)];
        aInst[0] = iBest;
        aInst[1] = FTS5_POS2COLUMN(aIter[iBest].iPos);
        aInst[2] = FTS5_POS2OFFSET(aIter[iBest].iPos);
        sqlite3Fts5PoslistReaderNext(&aIter[iBest]);
      }
    }

    pCsr->nInstCount = nInst;
    CsrFlagClear(pCsr, FTS5CSR_REQUIRE_INST);
  }
  return rc;
}

  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
  int rc = SQLITE_OK;
  if( CsrFlagTest(pCsr, FTS5CSR_REQUIRE_INST)==0 
   || SQLITE_OK==(rc = fts5CacheInstArray(pCsr)) 
  ){
    if( iIdx<0 || iIdx>=pCsr->nInstCount ){
      rc = SQLITE_RANGE;
#if 0
    }else if( fts5IsOffsetless((Fts5Table*)pCsr->base.pVtab) ){
      *piPhrase = pCsr->aInst[iIdx*3];
      *piCol = pCsr->aInst[iIdx*3 + 2];
      *piOff = -1;
#endif
    }else{
      *piPhrase = pCsr->aInst[iIdx*3];
      *piCol = pCsr->aInst[iIdx*3 + 1];
      *piOff = pCsr->aInst[iIdx*3 + 2];
    }
  }
  return rc;
}

static sqlite3_int64 fts5ApiRowid(Fts5Context *pCtx){
  return fts5CursorRowid((Fts5Cursor*)pCtx);
}

static int fts5ApiColumnText(
  Fts5Context *pCtx, 
  int iCol, 
  const char **pz, 
  int *pn
){
  int rc = SQLITE_OK;
  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
  if( fts5IsContentless((Fts5Table*)(pCsr->base.pVtab)) ){
    *pz = 0;
    *pn = 0;
  }else{
    rc = fts5SeekCursor(pCsr, 0);
    if( rc==SQLITE_OK ){
      *pz = (const char*)sqlite3_column_text(pCsr->pStmt, iCol+1);
      *pn = sqlite3_column_bytes(pCsr->pStmt, iCol+1);
    }
  }
  return rc;
}

static int fts5ColumnSizeCb(
  void *pContext,                 /* Pointer to int */
  int tflags,
  const char *pToken,             /* Buffer containing token */
  int nToken,                     /* Size of token in bytes */
  int iStart,                     /* Start offset of token */
  int iEnd                        /* End offset of token */

      *piOff = 0;
      pIter->a += fts5GetVarint32(pIter->a, iVal);
    }
    *piOff += (iVal-2);
  }
}

static void fts5ApiPhraseFirst(
static int fts5ApiPhraseFirst(
  Fts5Context *pCtx, 
  int iPhrase, 
  Fts5PhraseIter *pIter, 
  int *piCol, int *piOff
){
  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
  int n;
  int n = fts5CsrPoslist(pCsr, iPhrase, &pIter->a);
  pIter->b = &pIter->a[n];
  *piCol = 0;
  *piOff = 0;
  fts5ApiPhraseNext(pCtx, pIter, piCol, piOff);
}
  int rc = fts5CsrPoslist(pCsr, iPhrase, &pIter->a, &n);
  if( rc==SQLITE_OK ){
    pIter->b = &pIter->a[n];
    *piCol = 0;
    *piOff = 0;
    fts5ApiPhraseNext(pCtx, pIter, piCol, piOff);
  }
  return rc;
}

static void fts5ApiPhraseNextColumn(
  Fts5Context *pCtx, 
  Fts5PhraseIter *pIter, 
  int *piCol
){
  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
  Fts5Config *pConfig = ((Fts5Table*)(pCsr->base.pVtab))->pConfig;

  if( pConfig->eDetail==FTS5_DETAIL_COLUMNS ){
    if( pIter->a>=pIter->b ){
      *piCol = -1;
    }else{
      int iIncr;
      pIter->a += fts5GetVarint32(&pIter->a[0], iIncr);
      *piCol += (iIncr-2);
    }
  }else{
    while( 1 ){
      int dummy;
      if( pIter->a>=pIter->b ){
        *piCol = -1;
        return;
      }
      if( pIter->a[0]==0x01 ) break;
      pIter->a += fts5GetVarint32(pIter->a, dummy);
    }
    pIter->a += 1 + fts5GetVarint32(&pIter->a[1], *piCol);
  }
}

static int fts5ApiPhraseFirstColumn(
  Fts5Context *pCtx, 
  int iPhrase, 
  Fts5PhraseIter *pIter, 
  int *piCol
){
  int rc = SQLITE_OK;
  Fts5Cursor *pCsr = (Fts5Cursor*)pCtx;
  Fts5Config *pConfig = ((Fts5Table*)(pCsr->base.pVtab))->pConfig;

  if( pConfig->eDetail==FTS5_DETAIL_COLUMNS ){
    int n;
    rc = sqlite3Fts5ExprPhraseCollist(pCsr->pExpr, iPhrase, &pIter->a, &n);
    if( rc==SQLITE_OK ){
      pIter->b = &pIter->a[n];
      *piCol = 0;
      fts5ApiPhraseNextColumn(pCtx, pIter, piCol);
    }
  }else{
    int n;
    rc = fts5CsrPoslist(pCsr, iPhrase, &pIter->a, &n);
    if( rc==SQLITE_OK ){
      pIter->b = &pIter->a[n];
      if( n<=0 ){
        *piCol = -1;
      }else if( pIter->a[0]==0x01 ){
        pIter->a += 1 + fts5GetVarint32(&pIter->a[1], *piCol);
      }else{
        *piCol = 0;
      }
    }
  }

  return rc;
}


static int fts5ApiQueryPhrase(Fts5Context*, int, void*, 
    int(*)(const Fts5ExtensionApi*, Fts5Context*, void*)
);

static const Fts5ExtensionApi sFts5Api = {
  2,                            /* iVersion */

  fts5ApiColumnText,
  fts5ApiColumnSize,
  fts5ApiQueryPhrase,
  fts5ApiSetAuxdata,
  fts5ApiGetAuxdata,
  fts5ApiPhraseFirst,
  fts5ApiPhraseNext,
  fts5ApiPhraseFirstColumn,
  fts5ApiPhraseNextColumn,
};


/*
** Implementation of API function xQueryPhrase().
*/
static int fts5ApiQueryPhrase(
  Fts5Context *pCtx, 
  int iPhrase, 

static int fts5PoslistBlob(sqlite3_context *pCtx, Fts5Cursor *pCsr){
  int i;
  int rc = SQLITE_OK;
  int nPhrase = sqlite3Fts5ExprPhraseCount(pCsr->pExpr);
  Fts5Buffer val;

  memset(&val, 0, sizeof(Fts5Buffer));
  switch( ((Fts5Table*)(pCsr->base.pVtab))->pConfig->eDetail ){
    case FTS5_DETAIL_FULL:

  /* Append the varints */
  for(i=0; i<(nPhrase-1); i++){
    const u8 *dummy;
    int nByte = sqlite3Fts5ExprPoslist(pCsr->pExpr, i, &dummy);
    sqlite3Fts5BufferAppendVarint(&rc, &val, nByte);
  }
      /* Append the varints */
      for(i=0; i<(nPhrase-1); i++){
        const u8 *dummy;
        int nByte = sqlite3Fts5ExprPoslist(pCsr->pExpr, i, &dummy);
        sqlite3Fts5BufferAppendVarint(&rc, &val, nByte);
      }

  /* Append the position lists */
  for(i=0; i<nPhrase; i++){
    const u8 *pPoslist;
    int nPoslist;
    nPoslist = sqlite3Fts5ExprPoslist(pCsr->pExpr, i, &pPoslist);
    sqlite3Fts5BufferAppendBlob(&rc, &val, nPoslist, pPoslist);
      /* Append the position lists */
      for(i=0; i<nPhrase; i++){
        const u8 *pPoslist;
        int nPoslist;
        nPoslist = sqlite3Fts5ExprPoslist(pCsr->pExpr, i, &pPoslist);
        sqlite3Fts5BufferAppendBlob(&rc, &val, nPoslist, pPoslist);
      }
      break;

    case FTS5_DETAIL_COLUMNS:

      /* Append the varints */
      for(i=0; rc==SQLITE_OK && i<(nPhrase-1); i++){
        const u8 *dummy;
        int nByte;
        rc = sqlite3Fts5ExprPhraseCollist(pCsr->pExpr, i, &dummy, &nByte);
        sqlite3Fts5BufferAppendVarint(&rc, &val, nByte);
      }

      /* Append the position lists */
      for(i=0; rc==SQLITE_OK && i<nPhrase; i++){
        const u8 *pPoslist;
        int nPoslist;
        rc = sqlite3Fts5ExprPhraseCollist(pCsr->pExpr, i, &pPoslist, &nPoslist);
        sqlite3Fts5BufferAppendBlob(&rc, &val, nPoslist, pPoslist);
      }
      break;

    default:
      break;
  }

  sqlite3_result_blob(pCtx, val.p, val.n, sqlite3_free);
  return rc;
}

/* 

*/
typedef struct Fts5IntegrityCtx Fts5IntegrityCtx;
struct Fts5IntegrityCtx {
  i64 iRowid;
  int iCol;
  int szCol;
  u64 cksum;
  Fts5Termset *pTermset;
  Fts5Config *pConfig;
};


/*
** Tokenization callback used by integrity check.
*/
static int fts5StorageIntegrityCallback(
  void *pContext,                 /* Pointer to Fts5InsertCtx object */
  void *pContext,                 /* Pointer to Fts5IntegrityCtx object */
  int tflags,
  const char *pToken,             /* Buffer containing token */
  int nToken,                     /* Size of token in bytes */
  int iStart,                     /* Start offset of token */
  int iEnd                        /* End offset of token */
){
  Fts5IntegrityCtx *pCtx = (Fts5IntegrityCtx*)pContext;
  Fts5Termset *pTermset = pCtx->pTermset;
  int bPresent;
  int ii;
  int rc = SQLITE_OK;
  int iPos;
  int iCol;

  if( (tflags & FTS5_TOKEN_COLOCATED)==0 || pCtx->szCol==0 ){
    pCtx->szCol++;
  }

  switch( pCtx->pConfig->eDetail ){
    case FTS5_DETAIL_FULL:
      iPos = pCtx->szCol-1;
      iCol = pCtx->iCol;
      break;

    case FTS5_DETAIL_COLUMNS:
      iPos = pCtx->iCol;
      iCol = 0;
      break;

    default:
      assert( pCtx->pConfig->eDetail==FTS5_DETAIL_NONE );
      iPos = 0;
      iCol = 0;
      break;
  }

  rc = sqlite3Fts5TermsetAdd(pTermset, 0, pToken, nToken, &bPresent);
  if( rc==SQLITE_OK && bPresent==0 ){
  pCtx->cksum ^= sqlite3Fts5IndexCksum(
      pCtx->pConfig, pCtx->iRowid, pCtx->iCol, pCtx->szCol-1, pToken, nToken
  );
  return SQLITE_OK;
    pCtx->cksum ^= sqlite3Fts5IndexEntryCksum(
        pCtx->iRowid, iCol, iPos, 0, pToken, nToken
    );
  }

  for(ii=0; rc==SQLITE_OK && ii<pCtx->pConfig->nPrefix; ii++){
    const int nChar = pCtx->pConfig->aPrefix[ii];
    int nByte = sqlite3Fts5IndexCharlenToBytelen(pToken, nToken, nChar);
    if( nByte ){
      rc = sqlite3Fts5TermsetAdd(pTermset, ii+1, pToken, nByte, &bPresent);
      if( bPresent==0 ){
        pCtx->cksum ^= sqlite3Fts5IndexEntryCksum(
            pCtx->iRowid, iCol, iPos, ii+1, pToken, nByte
        );
      }
    }
  }

  return rc;
}

/*
** Check that the contents of the FTS index match that of the %_content
** table. Return SQLITE_OK if they do, or SQLITE_CORRUPT if not. Return
** some other SQLite error code if an error occurs while attempting to
** determine this.

    int rc2;
    while( SQLITE_ROW==sqlite3_step(pScan) ){
      int i;
      ctx.iRowid = sqlite3_column_int64(pScan, 0);
      ctx.szCol = 0;
      if( pConfig->bColumnsize ){
        rc = sqlite3Fts5StorageDocsize(p, ctx.iRowid, aColSize);
      }
      if( rc==SQLITE_OK && pConfig->eDetail==FTS5_DETAIL_NONE ){
        rc = sqlite3Fts5TermsetNew(&ctx.pTermset);
      }
      for(i=0; rc==SQLITE_OK && i<pConfig->nCol; i++){
        if( pConfig->abUnindexed[i] ) continue;
        ctx.iCol = i;
        ctx.szCol = 0;
        if( pConfig->eDetail==FTS5_DETAIL_COLUMNS ){
          rc = sqlite3Fts5TermsetNew(&ctx.pTermset);
        }
        if( rc==SQLITE_OK ){
        rc = sqlite3Fts5Tokenize(pConfig, 
            FTS5_TOKENIZE_DOCUMENT,
            (const char*)sqlite3_column_text(pScan, i+1),
            sqlite3_column_bytes(pScan, i+1),
            (void*)&ctx,
            fts5StorageIntegrityCallback
        );
        if( pConfig->bColumnsize && ctx.szCol!=aColSize[i] ){
          rc = sqlite3Fts5Tokenize(pConfig, 
              FTS5_TOKENIZE_DOCUMENT,
              (const char*)sqlite3_column_text(pScan, i+1),
              sqlite3_column_bytes(pScan, i+1),
              (void*)&ctx,
              fts5StorageIntegrityCallback
          );
        }
        if( rc==SQLITE_OK && pConfig->bColumnsize && ctx.szCol!=aColSize[i] ){
          rc = FTS5_CORRUPT;
        }
        aTotalSize[i] += ctx.szCol;
        if( pConfig->eDetail==FTS5_DETAIL_COLUMNS ){
          sqlite3Fts5TermsetFree(ctx.pTermset);
          ctx.pTermset = 0;
      }
        }
      }
      sqlite3Fts5TermsetFree(ctx.pTermset);
      ctx.pTermset = 0;

      if( rc!=SQLITE_OK ) break;
    }
    rc2 = sqlite3_reset(pScan);
    if( rc==SQLITE_OK ) rc = rc2;
  }

  /* Test that the "totals" (sometimes called "averages") record looks Ok */

    { "xColumnText",       1, "COL" },                /*  9 */
    { "xColumnSize",       1, "COL" },                /* 10 */
    { "xQueryPhrase",      2, "PHRASE SCRIPT" },      /* 11 */
    { "xSetAuxdata",       1, "VALUE" },              /* 12 */
    { "xGetAuxdata",       1, "CLEAR" },              /* 13 */
    { "xSetAuxdataInt",    1, "INTEGER" },            /* 14 */
    { "xGetAuxdataInt",    1, "CLEAR" },              /* 15 */
    { "xPhraseForeach",    4, "IPHRASE COLVAR OFFVAR SCRIPT" }, /* 16 */
    { "xPhraseColumnForeach", 3, "IPHRASE COLVAR SCRIPT" }, /* 17 */
    { 0, 0, 0}
  };

  int rc;
  int iSub = 0;
  F5tApi *p = (F5tApi*)clientData;

    }
    CASE(15, "xGetAuxdataInt") {
      int iVal;
      int bClear;
      if( Tcl_GetBooleanFromObj(interp, objv[2], &bClear) ) return TCL_ERROR;
      iVal = ((char*)p->pApi->xGetAuxdata(p->pFts, bClear) - (char*)0);
      Tcl_SetObjResult(interp, Tcl_NewIntObj(iVal));
      break;
    }

    CASE(16, "xPhraseForeach") {
      int iPhrase;
      int iCol;
      int iOff;
      const char *zColvar;
      const char *zOffvar;
      Tcl_Obj *pScript = objv[5];
      Fts5PhraseIter iter;

      if( Tcl_GetIntFromObj(interp, objv[2], &iPhrase) ) return TCL_ERROR;
      zColvar = Tcl_GetString(objv[3]);
      zOffvar = Tcl_GetString(objv[4]);

      for(p->pApi->xPhraseFirst(p->pFts, iPhrase, &iter, &iCol, &iOff);
          iCol>=0;
          p->pApi->xPhraseNext(p->pFts, &iter, &iCol, &iOff)
      ){
        Tcl_SetVar2Ex(interp, zColvar, 0, Tcl_NewIntObj(iCol), 0);
        Tcl_SetVar2Ex(interp, zOffvar, 0, Tcl_NewIntObj(iOff), 0);
        rc = Tcl_EvalObjEx(interp, pScript, 0);
        if( rc==TCL_CONTINUE ) rc = TCL_OK;
        if( rc!=TCL_OK ){
          if( rc==TCL_BREAK ) rc = TCL_OK;
          break;
        }
      }

      break;
    }

    CASE(17, "xPhraseColumnForeach") {
      int iPhrase;
      int iCol;
      const char *zColvar;
      Tcl_Obj *pScript = objv[4];
      Fts5PhraseIter iter;

      if( Tcl_GetIntFromObj(interp, objv[2], &iPhrase) ) return TCL_ERROR;
      zColvar = Tcl_GetString(objv[3]);

      for(p->pApi->xPhraseFirstColumn(p->pFts, iPhrase, &iter, &iCol);
          iCol>=0;
          p->pApi->xPhraseNextColumn(p->pFts, &iter, &iCol)
      ){
        Tcl_SetVar2Ex(interp, zColvar, 0, Tcl_NewIntObj(iCol), 0);
        rc = Tcl_EvalObjEx(interp, pScript, 0);
        if( rc==TCL_CONTINUE ) rc = TCL_OK;
        if( rc!=TCL_OK ){
          if( rc==TCL_BREAK ) rc = TCL_OK;
          break;
        }
      }

      break;
    }

    default: 
      assert( 0 );
      break;
  }

){
  Fts5PhraseIter iter;
  int iCol, iOff;
  u32 *aOut = (u32*)pUserData;
  int iPrev = -1;

  for(pApi->xPhraseFirst(pFts, 0, &iter, &iCol, &iOff); 
      iOff>=0; 
      iCol>=0; 
      pApi->xPhraseNext(pFts, &iter, &iCol, &iOff)
  ){
    aOut[iCol*3+1]++;
    if( iCol!=iPrev ) aOut[iCol*3 + 2]++;
    iPrev = iCol;
  }

  char f,
  u32 *aOut
){
  int i;
  int rc = SQLITE_OK;

  switch( f ){
    case 'b': 
    case 'b': {
      int iPhrase;
      int nInt = ((p->nCol + 31) / 32) * p->nPhrase;
      for(i=0; i<nInt; i++) aOut[i] = 0;

      for(iPhrase=0; iPhrase<p->nPhrase; iPhrase++){
        Fts5PhraseIter iter;
        int iCol;
        for(pApi->xPhraseFirstColumn(pFts, iPhrase, &iter, &iCol);
            iCol>=0; 
            pApi->xPhraseNextColumn(pFts, &iter, &iCol)
        ){
          aOut[iPhrase * ((p->nCol+31)/32) + iCol/32] |= ((u32)1 << iCol%32);
        }
      }

      break;
    }

    case 'x':
    case 'y': {
      int nMul = (f=='x' ? 3 : 1);
      int iPhrase;

      if( f=='b' ){
        int nInt = ((p->nCol + 31) / 32) * p->nPhrase;
        for(i=0; i<nInt; i++) aOut[i] = 0;
      }else{
        for(i=0; i<(p->nCol*p->nPhrase); i++) aOut[i*nMul] = 0;
      for(i=0; i<(p->nCol*p->nPhrase); i++) aOut[i*nMul] = 0;
      }

      for(iPhrase=0; iPhrase<p->nPhrase; iPhrase++){
        Fts5PhraseIter iter;
        int iOff, iCol;
        for(pApi->xPhraseFirst(pFts, iPhrase, &iter, &iCol, &iOff); 
            iOff>=0; 
            pApi->xPhraseNext(pFts, &iter, &iCol, &iOff)

  int rc = SQLITE_OK;
  int nCol = pCsr->pConfig->nCol;

  pCsr->rowid++;

  if( pTab->eType==FTS5_VOCAB_COL ){
    for(pCsr->iCol++; pCsr->iCol<nCol; pCsr->iCol++){
      if( pCsr->aCnt[pCsr->iCol] ) break;
      if( pCsr->aDoc[pCsr->iCol] ) break;
    }
  }

  if( pTab->eType==FTS5_VOCAB_ROW || pCsr->iCol>=nCol ){
    if( sqlite3Fts5IterEof(pCsr->pIter) ){
      pCsr->bEof = 1;
    }else{

      assert( pTab->eType==FTS5_VOCAB_COL || pTab->eType==FTS5_VOCAB_ROW );
      while( rc==SQLITE_OK ){
        i64 dummy;
        const u8 *pPos; int nPos;   /* Position list */
        i64 iPos = 0;               /* 64-bit position read from poslist */
        int iOff = 0;               /* Current offset within position list */

        switch( pCsr->pConfig->eDetail ){
          case FTS5_DETAIL_FULL:
        rc = sqlite3Fts5IterPoslist(pCsr->pIter, 0, &pPos, &nPos, &dummy);
        if( rc==SQLITE_OK ){
          if( pTab->eType==FTS5_VOCAB_ROW ){
            while( 0==sqlite3Fts5PoslistNext64(pPos, nPos, &iOff, &iPos) ){
              pCsr->aCnt[0]++;
            }
            pCsr->aDoc[0]++;
          }else{
            int iCol = -1;
            while( 0==sqlite3Fts5PoslistNext64(pPos, nPos, &iOff, &iPos) ){
              int ii = FTS5_POS2COLUMN(iPos);
              pCsr->aCnt[ii]++;
              if( iCol!=ii ){
                pCsr->aDoc[ii]++;
                iCol = ii;
              }
            }
          }
            rc = sqlite3Fts5IterPoslist(pCsr->pIter, 0, &pPos, &nPos, &dummy);
            if( rc==SQLITE_OK ){
              if( pTab->eType==FTS5_VOCAB_ROW ){
                while( 0==sqlite3Fts5PoslistNext64(pPos, nPos, &iOff, &iPos) ){
                  pCsr->aCnt[0]++;
                }
                pCsr->aDoc[0]++;
              }else{
                int iCol = -1;
                while( 0==sqlite3Fts5PoslistNext64(pPos, nPos, &iOff, &iPos) ){
                  int ii = FTS5_POS2COLUMN(iPos);
                  pCsr->aCnt[ii]++;
                  if( iCol!=ii ){
                    pCsr->aDoc[ii]++;
                    iCol = ii;
                  }
                }
              }
            }
            break;

          case FTS5_DETAIL_COLUMNS:
            if( pTab->eType==FTS5_VOCAB_ROW ){
              pCsr->aDoc[0]++;
            }else{
              Fts5Buffer buf = {0, 0, 0};
              rc = sqlite3Fts5IterPoslistBuffer(pCsr->pIter, &buf);
              if( rc==SQLITE_OK ){
                while( 0==sqlite3Fts5PoslistNext64(buf.p, buf.n, &iOff,&iPos) ){
                  assert_nc( iPos>=0 && iPos<nCol );
                  if( iPos<nCol ) pCsr->aDoc[iPos]++;
                }
              }
              sqlite3Fts5BufferFree(&buf);
            }
            break;

          default: 
            assert( pCsr->pConfig->eDetail==FTS5_DETAIL_NONE );
            pCsr->aDoc[0]++;
            break;
        }

        if( rc==SQLITE_OK ){
          rc = sqlite3Fts5IterNextScan(pCsr->pIter);
        }

        if( rc==SQLITE_OK ){
          zTerm = sqlite3Fts5IterTerm(pCsr->pIter, &nTerm);
          if( nTerm!=pCsr->term.n || memcmp(zTerm, pCsr->term.p, nTerm) ){
            break;
          }
          if( sqlite3Fts5IterEof(pCsr->pIter) ) break;
        }
      }
    }
  }

  if( pCsr->bEof==0 && pTab->eType==FTS5_VOCAB_COL ){
    while( pCsr->aCnt[pCsr->iCol]==0 ) pCsr->iCol++;
    while( pCsr->aDoc[pCsr->iCol]==0 ) pCsr->iCol++;
    assert( pCsr->iCol<pCsr->pConfig->nCol );
  }
  return rc;
}

/*
** This is the xFilter implementation for the virtual table.

static int fts5VocabColumnMethod(
  sqlite3_vtab_cursor *pCursor,   /* Cursor to retrieve value from */
  sqlite3_context *pCtx,          /* Context for sqlite3_result_xxx() calls */
  int iCol                        /* Index of column to read value from */
){
  Fts5VocabCursor *pCsr = (Fts5VocabCursor*)pCursor;
  int eDetail = pCsr->pConfig->eDetail;
  int eType = ((Fts5VocabTable*)(pCursor->pVtab))->eType;
  i64 iVal = 0;

  if( iCol==0 ){
    sqlite3_result_text(
        pCtx, (const char*)pCsr->term.p, pCsr->term.n, SQLITE_TRANSIENT
    );
  }
  else if( ((Fts5VocabTable*)(pCursor->pVtab))->eType==FTS5_VOCAB_COL ){
  }else if( eType==FTS5_VOCAB_COL ){
    assert( iCol==1 || iCol==2 || iCol==3 );
    if( iCol==1 ){
      if( eDetail!=FTS5_DETAIL_NONE ){
      const char *z = pCsr->pConfig->azCol[pCsr->iCol];
      sqlite3_result_text(pCtx, z, -1, SQLITE_STATIC);
        const char *z = pCsr->pConfig->azCol[pCsr->iCol];
        sqlite3_result_text(pCtx, z, -1, SQLITE_STATIC);
      }
    }else if( iCol==2 ){
      sqlite3_result_int64(pCtx, pCsr->aDoc[pCsr->iCol]);
      iVal = pCsr->aDoc[pCsr->iCol];
    }else{
      sqlite3_result_int64(pCtx, pCsr->aCnt[pCsr->iCol]);
      iVal = pCsr->aCnt[pCsr->iCol];
    }
  }else{
    assert( iCol==1 || iCol==2 );
    if( iCol==1 ){
      sqlite3_result_int64(pCtx, pCsr->aDoc[0]);
      iVal = pCsr->aDoc[0];
    }else{
      sqlite3_result_int64(pCtx, pCsr->aCnt[0]);
      iVal = pCsr->aCnt[0];
    }
  }

  if( iVal>0 ) sqlite3_result_int64(pCtx, iVal);
  return SQLITE_OK;
}

/* 
** This is the xRowid method. The SQLite core calls this routine to
** retrieve the rowid for the current row of the result set. The
** rowid should be written to *pRowid.

proc fts5_test_poslist {cmd} {
  set res [list]
  for {set i 0} {$i < [$cmd xInstCount]} {incr i} {
    lappend res [string map {{ } .} [$cmd xInst $i]]
  }
  set res
}

proc fts5_test_poslist2 {cmd} {
  set res [list]

  for {set i 0} {$i < [$cmd xPhraseCount]} {incr i} {
    $cmd xPhraseForeach $i c o {
      lappend res $i.$c.$o
    }
  }

  set res
}

proc fts5_test_collist {cmd} {
  set res [list]

  for {set i 0} {$i < [$cmd xPhraseCount]} {incr i} {
    $cmd xPhraseColumnForeach $i c { lappend res $i.$c }
  }

  set res
}

proc fts5_test_columnsize {cmd} {
  set res [list]
  for {set i 0} {$i < [$cmd xColumnCount]} {incr i} {
    lappend res [$cmd xColumnSize $i]
  }
  set res

proc fts5_aux_test_functions {db} {
  foreach f {
    fts5_test_columnsize
    fts5_test_columntext
    fts5_test_columntotalsize
    fts5_test_poslist
    fts5_test_poslist2
    fts5_test_collist
    fts5_test_tokenize
    fts5_test_rowcount
    fts5_test_all

    fts5_test_queryphrase
    fts5_test_phrasecount
  } {

#   <phrase number> . <column number> . <token offset>
#
# Options:
#
#   -near N        (NEAR distance. Default 10)
#   -col  C        (List of column indexes to match against)
#   -pc   VARNAME  (variable in caller frame to use for phrase numbering)
#   -dict VARNAME  (array in caller frame to use for synonyms)
#
proc nearset {aCol args} {

  # Process the command line options.
  #
  set O(-near) 10
  set O(-col)  {}
  set O(-pc)   ""
  set O(-dict) ""

  set nOpt [lsearch -exact $args --]
  if {$nOpt<0} { error "no -- option" }

  # Set $lPhrase to be a list of phrases. $nPhrase its length.
  set lPhrase [lrange $args [expr $nOpt+1] end]
  set nPhrase [llength $lPhrase]

  foreach {k v} [lrange $args 0 [expr $nOpt-1]] {
    if {[info exists O($k)]==0} { error "unrecognized option $k" }
    set O($k) $v
  }

  if {$O(-pc) == ""} {
    set counter 0
  } else {
    upvar $O(-pc) counter
  }

  # Set $phraselist to be a list of phrases. $nPhrase its length.
  if {$O(-dict)!=""} { upvar $O(-dict) aDict }
  set phraselist [lrange $args [expr $nOpt+1] end]
  set nPhrase [llength $phraselist]

  for {set j 0} {$j < [llength $aCol]} {incr j} {
    for {set i 0} {$i < $nPhrase} {incr i} { 
      set A($j,$i) [list]
    }
  }

  # Loop through each column of the current row.
  set iCol -1
  foreach col $aCol {
  for {set iCol 0} {$iCol < [llength $aCol]} {incr iCol} {

    incr iCol
    # If there is a column filter, test whether this column is excluded. If
    # so, skip to the next iteration of this loop. Otherwise, set zCol to the
    # column value and nToken to the number of tokens that comprise it.
    if {$O(-col)!="" && [lsearch $O(-col) $iCol]<0} continue
    set zCol [lindex $aCol $iCol]
    set nToken [llength $col]
    set nToken [llength $zCol]

    # Each iteration of the following loop searches a substring of the 
    # column value for phrase matches. The last token of the substring
    # is token $iLast of the column value. The first token is:
    #
    #   iFirst = ($iLast - $O(-near) - 1)
    #
    # where $sz is the length of the phrase being searched for. A phrase 
    # counts as matching the substring if its first token lies on or before
    # $iLast and its last token on or after $iFirst.
    #
    # For example, if the query is "NEAR(a+b c, 2)" and the column value:
    #
    #   "x x x x A B x x C x"
    #    0 1 2 3 4 5 6 7 8 9"
    #
    # when (iLast==8 && iFirst=5) the range will contain both phrases and
    # so both instances can be added to the output poslists.
    #
    set iFL [expr $O(-near) >= $nToken ? $nToken - 1 : $O(-near)]
    for { } {$iFL < $nToken} {incr iFL} {
    set iLast [expr $O(-near) >= $nToken ? $nToken - 1 : $O(-near)]
    for { } {$iLast < $nToken} {incr iLast} {
      for {set iPhrase 0} {$iPhrase<$nPhrase} {incr iPhrase} {
        set B($iPhrase) [list]
      }

      catch { array unset B }
      
      for {set iPhrase 0} {$iPhrase<$nPhrase} {incr iPhrase} {
        set p [lindex $phraselist $iPhrase]
        set p [lindex $lPhrase $iPhrase]
        set nPm1 [expr {[llength $p] - 1}]
        set iFirst [expr $iFL - $O(-near) - [llength $p]]
        set iFirst [expr $iLast - $O(-near) - [llength $p]]

        for {set i $iFirst} {$i <= $iFL} {incr i} {
          if {[lrange $col $i [expr $i+$nPm1]] == $p} { lappend B($iPhrase) $i }
        for {set i $iFirst} {$i <= $iLast} {incr i} {
          set lCand [lrange $zCol $i [expr $i+$nPm1]]
          set bMatch 1
          foreach tok $p term $lCand {
            if {[nearset_match aDict $tok $term]==0} { set bMatch 0 ; break }
          }
          if {$bMatch} { lappend B($iPhrase) $i }
        }
        if {[llength $B($iPhrase)] == 0} break

        if {![info exists B($iPhrase)]} break
      }

      if {$iPhrase==$nPhrase} {
        for {set iPhrase 0} {$iPhrase<$nPhrase} {incr iPhrase} {
          set A($iCol,$iPhrase) [concat $A($iCol,$iPhrase) $B($iPhrase)]
          set A($iCol,$iPhrase) [lsort -integer -uniq $A($iCol,$iPhrase)]
        }

      foreach a $A($iCol,$iPhrase) {
        lappend res "$counter.$iCol.$a"
      }
    }
    incr counter
  }

  #puts $res
  #puts "$aCol -> $res"
  sort_poslist $res
}

proc nearset_match {aDictVar tok term} {
  if {[string match $tok $term]} { return 1 }

  upvar $aDictVar aDict
  if {[info exists aDict($tok)]} {
    foreach s $aDict($tok) {
      if {[string match $s $term]} { return 1 }
    }
  }
  return 0;
}

#-------------------------------------------------------------------------
# Usage:
#
#   sort_poslist LIST
#
# Sort a position list of the type returned by command [nearset]

    lappend ret $word $iOff [expr $iOff+$nToken]
    incr iOff $nToken
    incr iOff [gobble_whitespace text]
  }

  set ret
}

#-------------------------------------------------------------------------
#
proc foreach_detail_mode {prefix script} {
  set saved $::testprefix
  foreach d [list full col none] {
    set s [string map [list %DETAIL% $d] $script]
    set ::detail $d
    set ::testprefix "$prefix-$d"
    reset_db
    uplevel $s
    unset ::detail
  }
  set ::testprefix $saved
}

proc detail_check {} {
  if {$::detail != "none" && $::detail!="full" && $::detail!="col"} {
    error "not in foreach_detail_mode {...} block"
  }
}
proc detail_is_none {} { detail_check ; expr {$::detail == "none"} }
proc detail_is_col {}  { detail_check ; expr {$::detail == "col" } }
proc detail_is_full {} { detail_check ; expr {$::detail == "full"} }


#-------------------------------------------------------------------------
# Convert a poslist of the type returned by fts5_test_poslist() to a 
# collist as returned by fts5_test_collist().
#
proc fts5_poslist2collist {poslist} {
  set res [list]
  foreach h $poslist {
    regexp {(.*)\.[1234567890]+} $h -> cand
    lappend res $cand
  }
  set res [lsort -command fts5_collist_elem_compare -unique $res]
  return $res
}

# Comparison function used by fts5_poslist2collist to sort collist entries.
proc fts5_collist_elem_compare {a b} {
  foreach {a1 a2} [split $a .] {}
  foreach {b1 b2} [split $b .] {}

  if {$a1==$b1} { return [expr $a2 - $b2] }
  return [expr $a1 - $b1]
}


#--------------------------------------------------------------------------
# Construct and return a tcl list equivalent to that returned by the SQL
# query executed against database handle [db]:
#
#   SELECT 
#     rowid, 
#     fts5_test_poslist($tbl),
#     fts5_test_collist($tbl) 
#   FROM $tbl('$expr')
#   ORDER BY rowid $order;
#
proc fts5_query_data {expr tbl {order ASC} {aDictVar ""}} {

  # Figure out the set of columns in the FTS5 table. This routine does
  # not handle tables with UNINDEXED columns, but if it did, it would
  # have to be here.
  db eval "PRAGMA table_info = $tbl" x { lappend lCols $x(name) }

  set d ""
  if {$aDictVar != ""} {
    upvar $aDictVar aDict
    set d aDict
  }

  set cols ""
  foreach e $lCols { append cols ", '$e'" }
  set tclexpr [db one [subst -novar {
    SELECT fts5_expr_tcl( $expr, 'nearset $cols -dict $d -pc ::pc' [set cols] )
  }]]

  set res [list]
  db eval "SELECT rowid, * FROM $tbl ORDER BY rowid $order" x {
    set cols [list]
    foreach col $lCols { lappend cols $x($col) }
    
    set ::pc 0
    set rowdata [eval $tclexpr]
    if {$rowdata != ""} { 
      lappend res $x(rowid) $rowdata [fts5_poslist2collist $rowdata]
    }
  }

  set res
}

#-------------------------------------------------------------------------
# Similar to [fts5_query_data], but omit the collist field.
#
proc fts5_poslist_data {expr tbl {order ASC} {aDictVar ""}} {
  set res [list]

  if {$aDictVar!=""} {
    upvar $aDictVar aDict
    set dict aDict
  } else {
    set dict ""
  }

  foreach {rowid poslist collist} [fts5_query_data $expr $tbl $order $dict] {
    lappend res $rowid $poslist
  }
  set res
}

#-------------------------------------------------------------------------
#

# This command will only work inside a [foreach_detail_mode] block. It tests
# whether or not expression $expr run on FTS5 table $tbl is supported by
# the current mode. If so, 1 is returned. If not, 0.
#
#   detail=full    (all queries supported)
#   detail=col     (all but phrase queries and NEAR queries)
#   detail=none    (all but phrase queries, NEAR queries, and column filters)
#
proc fts5_expr_ok {expr tbl} {

  if {![detail_is_full]} {
    set nearset "nearset_rc"
    if {[detail_is_col]} { set nearset "nearset_rf" }

    set ::expr_not_ok 0
    db eval "PRAGMA table_info = $tbl" x { lappend lCols $x(name) }

    set cols ""
    foreach e $lCols { append cols ", '$e'" }
    set ::pc 0
    set tclexpr [db one [subst -novar {
      SELECT fts5_expr_tcl( $expr, '[set nearset] $cols -pc ::pc' [set cols] )
    }]]
    eval $tclexpr
    if {$::expr_not_ok} { return 0 }
  }

  return 1
}

# Helper for [fts5_expr_ok]
proc nearset_rf {aCol args} {
  set idx [lsearch -exact $args --]
  if {$idx != [llength $args]-2 || [llength [lindex $args end]]!=1} {
    set ::expr_not_ok 1
  }
  list
}

# Helper for [fts5_expr_ok]
proc nearset_rc {aCol args} {
  nearset_rf $aCol {*}$args
  if {[lsearch $args -col]>=0} { 
    set ::expr_not_ok 1
  }
  list
}

# If SQLITE_ENABLE_FTS5 is not defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}

foreach_detail_mode $::testprefix {

do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(a, b, c);
  SELECT name, sql FROM sqlite_master;
} {
  t1 {CREATE VIRTUAL TABLE t1 USING fts5(a, b, c)}
  t1_data {CREATE TABLE 't1_data'(id INTEGER PRIMARY KEY, block BLOB)}
  t1_idx {CREATE TABLE 't1_idx'(segid, term, pgno, PRIMARY KEY(segid, term)) WITHOUT ROWID}
  t1_content {CREATE TABLE 't1_content'(id INTEGER PRIMARY KEY, c0, c1, c2)}
  t1_docsize {CREATE TABLE 't1_docsize'(id INTEGER PRIMARY KEY, sz BLOB)}
  t1_config {CREATE TABLE 't1_config'(k PRIMARY KEY, v) WITHOUT ROWID}
}

do_execsql_test 1.1 {
  DROP TABLE t1;
  SELECT name, sql FROM sqlite_master;
} {
}

#-------------------------------------------------------------------------
#
reset_db

do_execsql_test 2.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(x,y);
  CREATE VIRTUAL TABLE t1 USING fts5(x, y, detail=%DETAIL%);
}
do_execsql_test 2.1 {
  INSERT INTO t1 VALUES('a b c', 'd e f');
}

do_test 2.2 {
  execsql { SELECT fts5_decode(id, block) FROM t1_data WHERE id==10 }

    SELECT rowid FROM t1 WHERE t1 MATCH $w ORDER BY rowid DESC;
  } {1}
}

do_execsql_test 2.4 {
  INSERT INTO t1(t1) VALUES('integrity-check');
}


#-------------------------------------------------------------------------
#
reset_db
do_execsql_test 3.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(x,y);
  CREATE VIRTUAL TABLE t1 USING fts5(x,y, detail=%DETAIL%);
}
foreach {i x y} {
   1  {g f d b f} {h h e i a}
   2  {f i g j e} {i j c f f}
   3  {e e i f a} {e h f d f}
   4  {h j f j i} {h a c f j}
   5  {d b j c g} {f e i b e}

  if {[set_test_counter errors]} break
}

#-------------------------------------------------------------------------
#
reset_db
do_execsql_test 4.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(x,y);
  CREATE VIRTUAL TABLE t1 USING fts5(x,y, detail=%DETAIL%);
  INSERT INTO t1(t1, rank) VALUES('pgsz', 32);
}
foreach {i x y} {
   1  {g f d b f} {h h e i a}
   2  {f i g j e} {i j c f f}
   3  {e e i f a} {e h f d f}
   4  {h j f j i} {h a c f j}

  if {[set_test_counter errors]} break
}

#-------------------------------------------------------------------------
#
reset_db
do_execsql_test 5.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(x,y);
  CREATE VIRTUAL TABLE t1 USING fts5(x,y, detail=%DETAIL%);
  INSERT INTO t1(t1, rank) VALUES('pgsz', 32);
}
foreach {i x y} {
   1  {dd abc abc abc abcde} {aaa dd ddd ddd aab}
   2  {dd aab d aaa b} {abcde c aaa aaa aaa}
   3  {abcde dd b b dd} {abc abc d abc ddddd}
   4  {aaa abcde dddd dddd abcde} {abc b b abcde abc}

  if {[set_test_counter errors]} break
}

#-------------------------------------------------------------------------
#
reset_db
do_execsql_test 6.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(x,y);
  CREATE VIRTUAL TABLE t1 USING fts5(x,y, detail=%DETAIL%);
  INSERT INTO t1(t1, rank) VALUES('pgsz', 32);
}

do_execsql_test 6.1 {
  INSERT  INTO t1(rowid, x, y) VALUES(22, 'a b c', 'c b a');
  REPLACE INTO t1(rowid, x, y) VALUES(22, 'd e f', 'f e d');
}

}


#-------------------------------------------------------------------------
#
reset_db
do_execsql_test 10.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(x,y);
  CREATE VIRTUAL TABLE t1 USING fts5(x,y, detail=%DETAIL%);
}
set d10 {
   1  {g f d b f} {h h e i a}
   2  {f i g j e} {i j c f f}
   3  {e e i f a} {e h f d f}
   4  {h j f j i} {h a c f j}
   5  {d b j c g} {f e i b e}

do_execsql_test 10.4.1 { DELETE FROM t1 }
do_execsql_test 10.4.2 { INSERT INTO t1(t1) VALUES('integrity-check') }

#-------------------------------------------------------------------------
#
do_catchsql_test 11.1 {
  CREATE VIRTUAL TABLE t2 USING fts5(a, b, c, rank);
  CREATE VIRTUAL TABLE t2 USING fts5(a, b, c, rank, detail=%DETAIL%);
} {1 {reserved fts5 column name: rank}}
do_catchsql_test 11.2 {
  CREATE VIRTUAL TABLE rank USING fts5(a, b, c);
  CREATE VIRTUAL TABLE rank USING fts5(a, b, c, detail=%DETAIL%);
} {1 {reserved fts5 table name: rank}}
do_catchsql_test 11.3 {
  CREATE VIRTUAL TABLE t2 USING fts5(a, b, c, rowid);
  CREATE VIRTUAL TABLE t2 USING fts5(a, b, c, rowid, detail=%DETAIL%);
} {1 {reserved fts5 column name: rowid}}

#-------------------------------------------------------------------------
#
do_execsql_test 12.1 {
  CREATE VIRTUAL TABLE t2 USING fts5(x,y);
  CREATE VIRTUAL TABLE t2 USING fts5(x,y, detail=%DETAIL%);
} {}

do_catchsql_test 12.2 {
  SELECT t2 FROM t2 WHERE t2 MATCH '*stuff'
} {1 {unknown special query: stuff}}

do_test 12.3 {
  set res [db eval { SELECT t2 FROM t2 WHERE t2 MATCH '* reads ' }]
  string is integer $res
} {1}

#-------------------------------------------------------------------------
#
reset_db
do_execsql_test 13.1 {
  CREATE VIRTUAL TABLE t1 USING fts5(x);
  CREATE VIRTUAL TABLE t1 USING fts5(x, detail=%DETAIL%);
  INSERT INTO t1(rowid, x) VALUES(1, 'o n e'), (2, 't w o');
} {}

do_execsql_test 13.2 {
  SELECT rowid FROM t1 WHERE t1 MATCH 'o';
} {1 2}

  SELECT rowid FROM t1 WHERE t1 MATCH '""';
} {}

#-------------------------------------------------------------------------
#
reset_db
do_execsql_test 14.1 {
  CREATE VIRTUAL TABLE t1 USING fts5(x, y);
  CREATE VIRTUAL TABLE t1 USING fts5(x, y, detail=%DETAIL%);
  INSERT INTO t1(t1, rank) VALUES('pgsz', 32);
  WITH d(x,y) AS (
    SELECT NULL, 'xyz xyz xyz xyz xyz xyz'
    UNION ALL 
    SELECT NULL, 'xyz xyz xyz xyz xyz xyz' FROM d
  )
  INSERT INTO t1 SELECT * FROM d LIMIT 200;
}

do_execsql_test 15.x {
  INSERT INTO t1(t1) VALUES('integrity-check');
}

do_test 14.2 {
  set nRow 0
  db eval { SELECT * FROM t1 WHERE t1 MATCH 'xyz' } {
    db eval {
      BEGIN;
        CREATE TABLE t2(a, b);

#
do_execsql_test 16.1 {
  CREATE VIRTUAL TABLE n1 USING fts5(a);
  INSERT INTO n1 VALUES('a b c d');
}

proc funk {} {
  db eval { UPDATE n1_config SET v=50 WHERE k='version' }
  set fd [db incrblob main n1_data block 10]
  fconfigure $fd -encoding binary -translation binary
  puts -nonewline $fd "\x44\x45"
  close $fd
  db eval { UPDATE n1_config SET v=50 WHERE k='version' }
}
db func funk funk

do_catchsql_test 16.2 {
  SELECT funk(), bm25(n1), funk() FROM n1 WHERE n1 MATCH 'a+b+c+d'
} {1 {SQL logic error or missing database}}

#-------------------------------------------------------------------------
#
reset_db
do_execsql_test 17.1 {
  CREATE VIRTUAL TABLE b2 USING fts5(x);
  CREATE VIRTUAL TABLE b2 USING fts5(x, detail=%DETAIL%);
  INSERT INTO b2 VALUES('a');
  INSERT INTO b2 VALUES('b');
  INSERT INTO b2 VALUES('c');
}

do_test 17.2 {
  set res [list]
  db eval { SELECT * FROM b2 ORDER BY rowid ASC } {
    lappend res [execsql { SELECT * FROM b2 ORDER BY rowid ASC }]
  }
  set res
} {{a b c} {a b c} {a b c}}

if {[string match n* %DETAIL%]==0} {
reset_db
do_execsql_test 18.1 {
  CREATE VIRTUAL TABLE c2 USING fts5(x, y);
  INSERT INTO c2 VALUES('x x x', 'x x x');
  SELECT rowid FROM c2 WHERE c2 MATCH 'y:x';
} {1}
  reset_db
  do_execsql_test 17.3 {
    CREATE VIRTUAL TABLE c2 USING fts5(x, y, detail=%DETAIL%);
    INSERT INTO c2 VALUES('x x x', 'x x x');
    SELECT rowid FROM c2 WHERE c2 MATCH 'y:x';
  } {1}
}

#-------------------------------------------------------------------------
#
reset_db
do_execsql_test 17.1 {
  CREATE VIRTUAL TABLE uio USING fts5(ttt);
  CREATE VIRTUAL TABLE uio USING fts5(ttt, detail=%DETAIL%);
  INSERT INTO uio VALUES(NULL);
  INSERT INTO uio SELECT NULL FROM uio;
  INSERT INTO uio SELECT NULL FROM uio;
  INSERT INTO uio SELECT NULL FROM uio;
  INSERT INTO uio SELECT NULL FROM uio;
  INSERT INTO uio SELECT NULL FROM uio;
  INSERT INTO uio SELECT NULL FROM uio;

do_execsql_test 17.9 {
  SELECT min(rowid), max(rowid), count(*) FROM uio WHERE rowid < 10;
} {-9223372036854775808 9 10}

#--------------------------------------------------------------------
#
do_execsql_test 18.1 {
  CREATE VIRTUAL TABLE t1 USING fts5(a, b);
  CREATE VIRTUAL TABLE t2 USING fts5(c, d);
  CREATE VIRTUAL TABLE t1 USING fts5(a, b, detail=%DETAIL%);
  CREATE VIRTUAL TABLE t2 USING fts5(c, d, detail=%DETAIL%);
  INSERT INTO t1 VALUES('abc*', NULL);
  INSERT INTO t2 VALUES(1, 'abcdefg');
}
do_execsql_test 18.2 {
  SELECT t1.rowid, t2.rowid FROM t1, t2 WHERE t2 MATCH t1.a AND t1.rowid = t2.c
} {1 1}
do_execsql_test 18.3 {
  SELECT t1.rowid, t2.rowid FROM t2, t1 WHERE t2 MATCH t1.a AND t1.rowid = t2.c
} {1 1}

#--------------------------------------------------------------------
# fts5 table in the temp schema.
#
reset_db
do_execsql_test 19.0 {
  CREATE VIRTUAL TABLE temp.t1 USING fts5(x);
  CREATE VIRTUAL TABLE temp.t1 USING fts5(x, detail=%DETAIL%);
  INSERT INTO t1 VALUES('x y z');
  INSERT INTO t1 VALUES('w x 1');
  SELECT rowid FROM t1 WHERE t1 MATCH 'x';
} {1 2}

#--------------------------------------------------------------------
# Test that 6 and 7 byte varints can be read.
#
reset_db
do_execsql_test 20.0 {
  CREATE VIRTUAL TABLE temp.tmp USING fts5(x);
  CREATE VIRTUAL TABLE temp.tmp USING fts5(x, detail=%DETAIL%);
}
set ::ids [list \
  0 [expr 1<<36] [expr 2<<36] [expr 1<<43] [expr 2<<43]
]
do_test 20.1 {
  foreach id $::ids {
    execsql { INSERT INTO tmp(rowid, x) VALUES($id, 'x y z') }
  }
  execsql { SELECT rowid FROM tmp WHERE tmp MATCH 'y' }
} $::ids

}


finish_test

# If SQLITE_ENABLE_FTS5 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}

foreach_detail_mode $testprefix {

do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(a, b);
  CREATE VIRTUAL TABLE t1 USING fts5(a, b, detail=%DETAIL%);
  INSERT INTO t1 VALUES('hello', 'world');
  INSERT INTO t1 VALUES('one two', 'three four');
  INSERT INTO t1(rowid, a, b) VALUES(45, 'forty', 'five');
}

do_execsql_test 1.1 {
  SELECT * FROM t1 ORDER BY rowid DESC;

  SELECT * FROM t1 WHERE rowid=1.99;
} {}

#-------------------------------------------------------------------------

reset_db
do_execsql_test 2.1 {
  CREATE VIRTUAL TABLE t1 USING fts5(x);
  CREATE VIRTUAL TABLE t1 USING fts5(x, detail=%DETAIL%);
  INSERT INTO t1(t1, rank) VALUES('pgsz', 32);
  INSERT INTO t1 VALUES('one');
  INSERT INTO t1 VALUES('two');
  INSERT INTO t1 VALUES('three');
}

do_catchsql_test 2.2 {

}

#-------------------------------------------------------------------------
# Documents with more than 2M tokens.
#

do_execsql_test 4.0 {
  CREATE VIRTUAL TABLE s1 USING fts5(x);
  CREATE VIRTUAL TABLE s1 USING fts5(x, detail=%DETAIL%);
}
foreach {tn doc} [list \
  1 [string repeat {a x } 1500000]       \
  2 "[string repeat {a a } 1500000] x"   \
] {
  do_execsql_test 4.$tn { INSERT INTO s1 VALUES($doc) }
}

do_execsql_test 4.3 {
  SELECT rowid FROM s1 WHERE s1 MATCH 'x'
} {1 2}

if {[detail_is_full]} {
do_execsql_test 4.4 {
  SELECT rowid FROM s1 WHERE s1 MATCH '"a x"'
  do_execsql_test 4.4 {
    SELECT rowid FROM s1 WHERE s1 MATCH '"a x"'
  } {1 2}
}

do_execsql_test 4.5 {
  SELECT rowid FROM s1 WHERE s1 MATCH 'a x'
} {1 2}

#-------------------------------------------------------------------------
# Check that a special case of segment promotion works. The case is where
# a new segment is written to level L, but the oldest segment within level
# (L-2) is larger than it.
#
do_execsql_test 5.0 {
  CREATE VIRTUAL TABLE s2 USING fts5(x);
  CREATE VIRTUAL TABLE s2 USING fts5(x, detail=%DETAIL%);
  INSERT INTO s2(s2, rank) VALUES('pgsz', 32);
  INSERT INTO s2(s2, rank) VALUES('automerge', 0);
}

proc rnddoc {n} {
  set map [list 0 a  1 b  2 c  3 d  4 e  5 f  6 g  7 h  8 i  9 j]
  set doc [list]

} {8 0 0}

# Test also the other type of segment promotion - when a new segment is written
# that is larger than segments immediately following it.
do_test 5.3 {
  execsql {
    DROP TABLE s2;
    CREATE VIRTUAL TABLE s2 USING fts5(x);
    CREATE VIRTUAL TABLE s2 USING fts5(x, detail=%DETAIL%);
    INSERT INTO s2(s2, rank) VALUES('pgsz', 32);
    INSERT INTO s2(s2, rank) VALUES('automerge', 0);
  }

  for {set i 1} {$i <= 16} {incr i} {
    execsql { INSERT INTO s2 VALUES(rnddoc(5)) }
  }
  fts5_level_segs s2
} {0 1}

do_test 5.4 {
  execsql { INSERT INTO s2 VALUES(rnddoc(160)) }
  fts5_level_segs s2
} {2 0}

#-------------------------------------------------------------------------
#
do_execsql_test 6.0 {
  CREATE VIRTUAL TABLE s3 USING fts5(x);
  CREATE VIRTUAL TABLE s3 USING fts5(x, detail=%DETAIL%);
  BEGIN;
    INSERT INTO s3 VALUES('a b c');
    INSERT INTO s3 VALUES('A B C');
}

do_execsql_test 6.1.1 {
  SELECT rowid FROM s3 WHERE s3 MATCH 'a'

    ROLLBACK;
  }
} {}

#-------------------------------------------------------------------------
#
set doc [string repeat "a b c " 500]
breakpoint
do_execsql_test 7.0 {
  CREATE VIRTUAL TABLE x1 USING fts5(x);
  CREATE VIRTUAL TABLE x1 USING fts5(x, detail=%DETAIL%);
  INSERT INTO x1(x1, rank) VALUES('pgsz', 32);
  INSERT INTO x1 VALUES($doc);
}

} ;# foreach_detail_mode...


finish_test

# If SQLITE_ENABLE_FTS5 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}

foreach_detail_mode $testprefix {

set data {
    0   {p o q e z k z p n f y u z y n y}   {l o o l v v k}
    1   {p k h h p y l l h i p v n}         {p p l u r i f a j g e r r x w}
    2   {l s z j k i m p s}                 {l w e j t j e e i t w r o p o}
    3   {x g y m y m h p}                   {k j j b r e y y a k y}
    4   {q m a i y i z}                     {o w a g k x g j m w e u k}
    5   {k o a w y b s z}                   {s g l m m l m g p}

    94  {s f e a e t i h h d q p z t q}     {b k m k w h c}
    95  {h b n j t k i h o q u}             {w n g i t o k c a m y p f l x c p}
    96  {f c x p y r b m o l m o a}         {p c a q s u n n x d c f a o}
    97  {u h h k m n k}                     {u b v n u a o c}
    98  {s p e t c z d f n w f}             {l s f j b l c e s h}
    99  {r c v w i v h a t a c v c r e}     {h h u m g o f b a e o}
}

# Argument $expr is an FTS5 match expression designed to be executed against
# an FTS5 table with the following schema:
# 
#   CREATE VIRTUAL TABLE xy USING fts5(x, y);
#
# Assuming the table contains the same records as stored int the global 
# $::data array (see above), this function returns a list containing one
# element for each match in the dataset. The elements are themselves lists
# formatted as follows:
#
#   <rowid> {<phrase 0 matches> <phrase 1 matches>...}
#
# where each <phrase X matches> element is a list of phrase matches in the
# same form as returned by auxiliary scalar function fts5_test().
#
proc matchdata {bPos expr {bAsc 1}} {

  set tclexpr [db one {
    SELECT fts5_expr_tcl($expr, 'nearset $cols -pc ::pc', 'x', 'y')
  }]
  set res [list]

  #puts $tclexpr
  foreach {id x y} $::data {
    set cols [list $x $y]
    set ::pc 0
    #set hits [lsort -command instcompare [eval $tclexpr]]
    set hits [eval $tclexpr]
    if {[llength $hits]>0} {
      if {$bPos} {
        lappend res [list $id $hits]
      } else {
        lappend res $id
      }
    }
  }

  if {$bAsc} {
    set res [lsort -integer -increasing -index 0 $res]
  } else {
    set res [lsort -integer -decreasing -index 0 $res]
  }

  return [concat {*}$res]
}

#
# End of test code
#-------------------------------------------------------------------------

proc fts5_test_poslist {cmd} {
  set res [list]
  for {set i 0} {$i < [$cmd xInstCount]} {incr i} {
    lappend res [string map {{ } .} [$cmd xInst $i]]
  }
  set res
}


foreach {tn2 sql} {
  1  {}
  2  {BEGIN}
} {
  reset_db
  sqlite3_fts5_create_function db fts5_test_poslist fts5_test_poslist
  fts5_aux_test_functions db

  do_execsql_test 1.0 {
    CREATE VIRTUAL TABLE xx USING fts5(x,y);
  do_execsql_test 1.$tn2.0 {
    CREATE VIRTUAL TABLE xx USING fts5(x,y, detail=%DETAIL%);
    INSERT INTO xx(xx, rank) VALUES('pgsz', 32);
  }

  execsql $sql

  do_test $tn2.1.1 {
  do_test 1.$tn2.1.1 {
    foreach {id x y} $data {
      execsql { INSERT INTO xx(rowid, x, y) VALUES($id, $x, $y) }
    }
    execsql { INSERT INTO xx(xx) VALUES('integrity-check') }
  } {}


  #-------------------------------------------------------------------------
  # Test phrase queries.
  #
  foreach {tn phrase} {
    1 "o"
    2 "b q"
    3 "e a e"
    4 "m d g q q b k b w f q q p p"
    5 "l o o l v v k"
    6 "a"
    7 "b"
    8 "c"
    9 "no"
    10 "L O O L V V K"
  } {
    set expr "\"$phrase\""
    set res [matchdata 1 $expr]

    do_execsql_test $tn2.1.2.$tn.[llength $res] { 
  do_execsql_test 1.$tn2.integrity {
      SELECT rowid, fts5_test_poslist(xx) FROM xx WHERE xx match $expr
    } $res
    INSERT INTO xx(xx) VALUES('integrity-check');
  }

  #-------------------------------------------------------------------------
  # Test some AND and OR queries.
  #
  foreach {tn expr} {
    1.2 "a   OR b"
    1.1 "a   AND b"
    1.2 "a+b AND c"
    1.3 "d+c AND u"
    1.4 "d+c AND u+d"

    2.1 "a   OR b"
    2.2 "a+b OR c"
    2.3 "d+c OR u"
    2.4 "d+c OR u+d"

    3.1 { a AND b AND c }
  } {
    set res [matchdata 1 $expr]
    do_execsql_test $tn2.2.$tn.[llength $res] { 
    1.3 "o"
    1.4 "b q"
    1.5 "e a e"
    1.6 "m d g q q b k b w f q q p p"
    1.7 "l o o l v v k"
    1.8 "a"
    1.9 "b"
    1.10 "c"
    1.11 "no"
    1.12 "L O O L V V K"
    1.13 "a AND b AND c"
    1.14 "x:a"

    2.1 "x:a"
    2.2 "y:a"
      SELECT rowid, fts5_test_poslist(xx) FROM xx WHERE xx match $expr
    } $res
  }
    2.3 "x:b"
    2.4 "y:b"

    3.1 "{x}:a"
    3.2 "{y}:a"
    3.3 "{x}:b"
    3.4 "{y}:b"

  #-------------------------------------------------------------------------
  # Queries on a specific column.
  #
    4.1 "{x y}:a"
    4.2 "{y x}:a"
    4.3 "{x x}:b"
    4.4 "{y y}:b"

  foreach {tn expr} {
    1.1 "x:a"
    1.2 "y:a"
    1.3 "x:b"
    1.4 "y:b"
    2.1 "{x}:a"
    2.2 "{y}:a"
    2.3 "{x}:b"
    2.4 "{y}:b"
    5.1 {{"x" "y"}:a}
    5.2 {{"y" x}:a}
    5.3 {{x "x"}:b}
    5.4 {{"y" y}:b}

    6.1 "b + q"
    6.2 "e + a + e"
    6.3 "m + d + g + q + q + b + k + b + w + f + q + q + p + p"
    6.4 "l + o + o + l + v + v + k"
    6.5 "L + O + O + L + V + V + K"

    3.1 "{x y}:a"
    3.2 "{y x}:a"
    3.3 "{x x}:b"
    3.4 "{y y}:b"
    7.1 "a+b AND c"
    7.2 "d+c AND u"
    7.3 "d+c AND u+d"
    7.4 "a+b OR c"
    7.5 "d+c OR u"
    7.6 "d+c OR u+d"

    4.1 {{"x" "y"}:a}
    4.2 {{"y" x}:a}
    4.3 {{x "x"}:b}
    4.4 {{"y" y}:b}
  } {
    8.1 "NEAR(a b)"
    8.2 "NEAR(r c)"
    8.2 { NEAR(r c, 5) }
    8.3 { NEAR(r c, 3) }
    8.4 { NEAR(r c, 2) }
    8.5 { NEAR(r c, 0) }
    set res [matchdata 1 $expr]
    do_execsql_test $tn2.3.$tn.[llength $res] { 
      SELECT rowid, fts5_test_poslist(xx) FROM xx WHERE xx match $expr
    } $res
  }

    8.6 { NEAR(a b c) }
    8.7 { NEAR(a b c, 8) }
    8.8  { x : NEAR(r c) }
    8.9  { y : NEAR(r c) }
  #-------------------------------------------------------------------------
  # Some NEAR queries.
  #

  foreach {tn expr} {
    1 "NEAR(a b)"
    2 "NEAR(r c)"
    2 { NEAR(r c, 5) }
    3 { NEAR(r c, 3) }
    4 { NEAR(r c, 2) }
    5 { NEAR(r c, 0) }
    6 { NEAR(a b c) }
    7 { NEAR(a b c, 8) }
    8  { x : NEAR(r c) }
    9  { y : NEAR(r c) }
  } {
    set res [matchdata 1 $expr]
    do_execsql_test $tn2.4.1.$tn.[llength $res] { 
      SELECT rowid, fts5_test_poslist(xx) FROM xx WHERE xx match $expr
    9.1 { NEAR(r c) }
    9.2 { NEAR(r c, 5) }
    9.3 { NEAR(r c, 3) }
    9.4 { NEAR(r c, 2) }
    9.5 { NEAR(r c, 0) }
    9.6 { NEAR(a b c) }
    9.7 { NEAR(a b c, 8) }
    9.8  { x : NEAR(r c) }
    9.9  { y : NEAR(r c) }
    9.10 { x : "r c" }
    9.11 { y : "r c" }
    9.12 { a AND b }
    9.13 { a AND b AND c }
    9.14a { a }
    9.14b { a OR b }
    9.15 { a OR b AND c }
    9.16 { c AND b OR a }
    } $res
  }

    9.17 { c AND (b OR a) }
  do_test $tn2.4.1  { nearset {{a b c}} -- a } {0.0.0}
  do_test $tn2.4.2  { nearset {{a b c}} -- c } {0.0.2}

    9.18 { c NOT (b OR a) }
  foreach {tn expr tclexpr} {
    1 {a b} {AND [N $x -- {a}] [N $x -- {b}]}
    9.19 { (c NOT b) OR (a AND d) }
  } {
    do_execsql_test $tn2.5.$tn {
      SELECT fts5_expr_tcl($expr, 'N $x')
    } [list $tclexpr]
  }


    if {[fts5_expr_ok $expr xx]==0} {
  #-------------------------------------------------------------------------
  #
  do_execsql_test $tn2.6.integrity {
      do_test 1.$tn2.$tn.OMITTED { list } [list]
    INSERT INTO xx(xx) VALUES('integrity-check');
  }
  #db eval {SELECT rowid, fts5_decode(rowid, block) aS r FROM xx_data} {puts $r}
  foreach {bAsc sql} {
    1 {SELECT rowid FROM xx WHERE xx MATCH $expr}
    0 {SELECT rowid FROM xx WHERE xx MATCH $expr ORDER BY rowid DESC}
  } {
    foreach {tn expr} {
      0.1 x
      continue
    }

    set res [fts5_query_data $expr xx]
    do_execsql_test 1.$tn2.$tn.[llength $res].asc {
      SELECT rowid, fts5_test_poslist(xx), fts5_test_collist(xx) 
      FROM xx WHERE xx match $expr
    } $res


      1 { NEAR(r c) }
      2 { NEAR(r c, 5) }
      3 { NEAR(r c, 3) }
      4 { NEAR(r c, 2) }
    set res [fts5_query_data $expr xx DESC]
    do_execsql_test 1.$tn2.$tn.[llength $res].desc {
      SELECT rowid, fts5_test_poslist(xx), fts5_test_collist(xx) 
      5 { NEAR(r c, 0) }
      6 { NEAR(a b c) }
      7 { NEAR(a b c, 8) }
      8  { x : NEAR(r c) }
      9  { y : NEAR(r c) }
      10 { x : "r c" }
      11 { y : "r c" }
      12 { a AND b }
      13 { a AND b AND c }
      14a { a }
      14b { a OR b }
      FROM xx WHERE xx match $expr ORDER BY 1 DESC
      15 { a OR b AND c }
      16 { c AND b OR a }
      17 { c AND (b OR a) }
      18 { c NOT (b OR a) }
      19 { c NOT b OR a AND d }
    } {
    } $res
      set res [matchdata 0 $expr $bAsc]
      do_execsql_test $tn2.6.$bAsc.$tn.[llength $res] $sql $res
    }
  }
}

do_execsql_test 3.1 {
  }
}

}

do_execsql_test 2.1 {
  SELECT fts5_expr_tcl('a AND b');
} {{AND [nearset -- {a}] [nearset -- {b}]}}

do_test 2.2.1  { nearset {{a b c}} -- a } {0.0.0}
do_test 2.2.2  { nearset {{a b c}} -- c } {0.0.2}

foreach {tn expr tclexpr} {
  1 {a b} {AND [N $x -- {a}] [N $x -- {b}]}
} {
  do_execsql_test 2.3.$tn {
    SELECT fts5_expr_tcl($expr, 'N $x')
  } [list $tclexpr]
}

finish_test

# If SQLITE_ENABLE_FTS5 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}

foreach_detail_mode $testprefix {

do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE yy USING fts5(x, y);
  CREATE VIRTUAL TABLE yy USING fts5(x, y, detail=%DETAIL%);
  INSERT INTO yy VALUES('Changes the result to be', 'the list of all matching');
  INSERT INTO yy VALUES('indices (or all  matching', 'values if -inline is');
  INSERT INTO yy VALUES('specified as  well.) If', 'indices are returned, the');
} {}

foreach {tn match res} {
  1 {c*} {1}

  do_execsql_test 1.$tn {
    SELECT rowid FROM yy WHERE yy MATCH $match
  } $res
}

foreach {T create} {
  2 {
    CREATE VIRTUAL TABLE t1 USING fts5(a, b);
    CREATE VIRTUAL TABLE t1 USING fts5(a, b, detail=%DETAIL%);
    INSERT INTO t1(t1, rank) VALUES('pgsz', 32);
  }
  
  3 {
    CREATE VIRTUAL TABLE t1 USING fts5(a, b, prefix=1,2,3,4,5);
    CREATE VIRTUAL TABLE t1 USING fts5(a, b, prefix="1,2,3,4", detail=%DETAIL%);
    INSERT INTO t1(t1, rank) VALUES('pgsz', 32);
  }

  4 {
    CREATE VIRTUAL TABLE t1 USING fts5(a, b);
    CREATE VIRTUAL TABLE t1 USING fts5(a, b, detail=%DETAIL%);
    INSERT INTO t1(t1, rank) VALUES('pgsz', 32);
    BEGIN;
  }
  
  5 {
    CREATE VIRTUAL TABLE t1 USING fts5(a, b, prefix=1,2,3,4,5);
    CREATE VIRTUAL TABLE t1 USING fts5(a, b, prefix="1,2,3,4", detail=%DETAIL%);
    INSERT INTO t1(t1, rank) VALUES('pgsz', 32);
    BEGIN;
  }

} {

  do_test $T.1 { 

      set n [llength $res]
      if {$T==5} breakpoint 
      do_execsql_test $T.$bAsc.$tn.$n $sql $res
    }
  }

  catchsql COMMIT
}

}

finish_test

# If SQLITE_ENABLE_FTS5 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}

foreach_detail_mode $testprefix {

do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(a, b);
  CREATE VIRTUAL TABLE t1 USING fts5(a, b, detail=%DETAIL%);
  INSERT INTO t1(t1, rank) VALUES('pgsz', 32);
}

do_execsql_test 1.1 {
  INSERT INTO t1 VALUES('hello', 'world');
  SELECT rowid FROM t1 WHERE t1 MATCH 'hello' ORDER BY rowid ASC;
} {1}

} {1 2 4}

fts5_aux_test_functions db

#-------------------------------------------------------------------------
# 
do_execsql_test 2.0 {
  CREATE VIRTUAL TABLE t2 USING fts5(x, y);
  CREATE VIRTUAL TABLE t2 USING fts5(x, y, detail=%DETAIL%);
  INSERT INTO t2 VALUES('u t l w w m s', 'm f m o l t k o p e');
  INSERT INTO t2 VALUES('f g q e l n d m z x q', 'z s i i i m f w w f n g p');
}

do_execsql_test 2.1 {
  SELECT rowid, fts5_test_poslist(t2) FROM t2 
  WHERE t2 MATCH 'm' ORDER BY rowid;
} {
  1 {0.0.5 0.1.0 0.1.2} 
  2 {0.0.7 0.1.5}
}

do_execsql_test 2.2 {
  SELECT rowid, fts5_test_poslist(t2) FROM t2 
  WHERE t2 MATCH 'u OR q' ORDER BY rowid;
} {
  1 {0.0.0}
  2 {1.0.2 1.0.10}
}

if {[detail_is_full]} {
do_execsql_test 2.3 {
  SELECT rowid, fts5_test_poslist(t2) FROM t2 
  WHERE t2 MATCH 'y:o' ORDER BY rowid;
} {
  1 {0.1.3 0.1.7}
  do_execsql_test 2.3 {
    SELECT rowid, fts5_test_poslist(t2) FROM t2 
      WHERE t2 MATCH 'y:o' ORDER BY rowid;
  } {
    1 {0.1.3 0.1.7}
  }
}

#-------------------------------------------------------------------------
# 
do_execsql_test 3.0 {
  CREATE VIRTUAL TABLE t3 USING fts5(x, y);
  CREATE VIRTUAL TABLE t3 USING fts5(x, y, detail=%DETAIL%);
  INSERT INTO t3 VALUES( 'j f h o x x a z g b a f a m i b', 'j z c z y x w t');
  INSERT INTO t3 VALUES( 'r c', '');
}

if {[detail_is_full]} {
do_execsql_test 3.1 {
  SELECT rowid, fts5_test_poslist(t3) FROM t3 WHERE t3 MATCH 'NEAR(a b)';
} {
  1 {0.0.6 1.0.9 0.0.10 0.0.12 1.0.15}
}
  do_execsql_test 3.1 {
    SELECT rowid, fts5_test_poslist(t3) FROM t3 WHERE t3 MATCH 'NEAR(a b)';
  } {
    1 {0.0.6 1.0.9 0.0.10 0.0.12 1.0.15}
  }

do_execsql_test 3.2 {
  SELECT rowid, fts5_test_poslist(t3) FROM t3 WHERE t3 MATCH 'NEAR(r c)';
} {
  2 {0.0.0 1.0.1}
  do_execsql_test 3.2 {
    SELECT rowid, fts5_test_poslist(t3) FROM t3 WHERE t3 MATCH 'NEAR(r c)';
  } {
    2 {0.0.0 1.0.1}
  }
}

do_execsql_test 3.3 {
  INSERT INTO t3 
  VALUES('k x j r m a d o i z j', 'r t t t f e b r x i v j v g o');
  SELECT rowid, fts5_test_poslist(t3) 
  FROM t3 WHERE t3 MATCH 'a OR b AND c';
} {
  1 {0.0.6 1.0.9 0.0.10 0.0.12 1.0.15 2.1.2}
  3 0.0.5 
}

#-------------------------------------------------------------------------
# 
do_execsql_test 4.0 {
  CREATE VIRTUAL TABLE t4 USING fts5(x, y);
  CREATE VIRTUAL TABLE t4 USING fts5(x, y, detail=%DETAIL%);
  INSERT INTO t4 
  VALUES('k x j r m a d o i z j', 'r t t t f e b r x i v j v g o');
}

do_execsql_test 4.1 {
  SELECT rowid, fts5_test_poslist(t4) FROM t4 WHERE t4 MATCH 'a OR b AND c';
} {
  1 0.0.5
}

#-------------------------------------------------------------------------
# Test that the xColumnSize() and xColumnAvgsize() APIs work.
#
reset_db
fts5_aux_test_functions db

do_execsql_test 5.1 {
  CREATE VIRTUAL TABLE t5 USING fts5(x, y);
  CREATE VIRTUAL TABLE t5 USING fts5(x, y, detail=%DETAIL%);
  INSERT INTO t5 VALUES('a b c d', 'e f g h i j');
  INSERT INTO t5 VALUES('', 'a');
  INSERT INTO t5 VALUES('a', '');
}
do_execsql_test 5.2 {
  SELECT rowid, fts5_test_columnsize(t5) FROM t5 WHERE t5 MATCH 'a'
  ORDER BY rowid DESC;

#-------------------------------------------------------------------------
# Test the xTokenize() API
#
reset_db
fts5_aux_test_functions db
do_execsql_test 6.1 {
  CREATE VIRTUAL TABLE t6 USING fts5(x, y);
  CREATE VIRTUAL TABLE t6 USING fts5(x, y, detail=%DETAIL%);
  INSERT INTO t6 VALUES('There are more', 'things in heaven and earth');
  INSERT INTO t6 VALUES(', Horatio, Than are', 'dreamt of in your philosophy.');
}

do_execsql_test 6.2 {
  SELECT rowid, fts5_test_tokenize(t6) FROM t6 WHERE t6 MATCH 't*'
} {
  1 {{there are more} {things in heaven and earth}}
  2 {{horatio than are} {dreamt of in your philosophy}}
}

#-------------------------------------------------------------------------
# Test the xQueryPhrase() API
#
reset_db
fts5_aux_test_functions db
do_execsql_test 7.1 {
  CREATE VIRTUAL TABLE t7 USING fts5(x, y);
  CREATE VIRTUAL TABLE t7 USING fts5(x, y, detail=%DETAIL%);
}
do_test 7.2 {
  foreach {x y} {
    {q i b w s a a e l o} {i b z a l f p t e u}
    {b a z t a l o x d i} {b p a d b f h d w y}
    {z m h n p p u i e g} {v h d v b x j j c z}
    {a g i m v a u c b i} {p k s o t l r t b m}

#  SELECT rowid, bm25debug(t7) FROM t7 WHERE t7 MATCH 'a';
#} {5 5 5 5}
#

#-------------------------------------------------------------------------
#
do_test 8.1 {
  execsql { CREATE VIRTUAL TABLE t8 USING fts5(x, y) }
  execsql { CREATE VIRTUAL TABLE t8 USING fts5(x, y, detail=%DETAIL%) }
  foreach {rowid x y} {
     0 {A o}   {o o o C o o o o o o o o}
     1 {o o B} {o o o C C o o o o o o o}
     2 {A o o} {o o o o D D o o o o o o}
     3 {o B}   {o o o o o D o o o o o o}
     4 {E o G} {H o o o o o o o o o o o}
     5 {F o G} {I o J o o o o o o o o o}

  2 {a OR b}       2
  3 {a OR b OR c}  3
  4 {NEAR(a b)}    2
} {
  do_execsql_test 9.2.$tn {
    SELECT fts5_test_phrasecount(t9) FROM t9 WHERE t9 MATCH $q LIMIT 1
  } $cnt
}

}

finish_test

# If SQLITE_ENABLE_FTS5 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}

foreach_detail_mode $testprefix {

do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(x, y);
  CREATE VIRTUAL TABLE t1 USING fts5(x, y, detail=%DETAIL%);
}

proc do_snippet_test {tn doc match res} {

  uplevel #0 [list set v1 $doc]
  uplevel #0 [list set v2 $match]

  7.4 {o o o X o o X o o} {...o [X] o o [X] o o}
  7.5 {o o o o X o o X o} {...o o [X] o o [X] o}
  7.6 {o o o o o X o o X} {...o o o [X] o o [X]}
} {
  do_snippet_test 1.$tn $doc X $res
}

if {[detail_is_full]} {
foreach {tn doc res} {
  1.1 {X Y o o o o o} {[X Y] o o o o o}
  1.2 {o X Y o o o o} {o [X Y] o o o o}
  1.3 {o o X Y o o o} {o o [X Y] o o o}
  1.4 {o o o X Y o o} {o o o [X Y] o o}
  1.5 {o o o o X Y o} {o o o o [X Y] o}
  1.6 {o o o o o X Y} {o o o o o [X Y]}
  foreach {tn doc res} {
    1.1 {X Y o o o o o} {[X Y] o o o o o}
    1.2 {o X Y o o o o} {o [X Y] o o o o}
    1.3 {o o X Y o o o} {o o [X Y] o o o}
    1.4 {o o o X Y o o} {o o o [X Y] o o}
    1.5 {o o o o X Y o} {o o o o [X Y] o}
    1.6 {o o o o o X Y} {o o o o o [X Y]}

  2.1 {X Y o o o o o o} {[X Y] o o o o o...}
  2.2 {o X Y o o o o o} {o [X Y] o o o o...}
  2.3 {o o X Y o o o o} {o o [X Y] o o o...}
  2.4 {o o o X Y o o o} {...o o [X Y] o o o}
  2.5 {o o o o X Y o o} {...o o o [X Y] o o}
  2.6 {o o o o o X Y o} {...o o o o [X Y] o}
  2.7 {o o o o o o X Y} {...o o o o o [X Y]}
    2.1 {X Y o o o o o o} {[X Y] o o o o o...}
    2.2 {o X Y o o o o o} {o [X Y] o o o o...}
    2.3 {o o X Y o o o o} {o o [X Y] o o o...}
    2.4 {o o o X Y o o o} {...o o [X Y] o o o}
    2.5 {o o o o X Y o o} {...o o o [X Y] o o}
    2.6 {o o o o o X Y o} {...o o o o [X Y] o}
    2.7 {o o o o o o X Y} {...o o o o o [X Y]}

  3.1 {X Y o o o o o o o} {[X Y] o o o o o...}
  3.2 {o X Y o o o o o o} {o [X Y] o o o o...}
  3.3 {o o X Y o o o o o} {o o [X Y] o o o...}
  3.4 {o o o X Y o o o o} {...o o [X Y] o o o...}
  3.5 {o o o o X Y o o o} {...o o [X Y] o o o}
  3.6 {o o o o o X Y o o} {...o o o [X Y] o o}
  3.7 {o o o o o o X Y o} {...o o o o [X Y] o}
  3.8 {o o o o o o o X Y} {...o o o o o [X Y]}
    3.1 {X Y o o o o o o o} {[X Y] o o o o o...}
    3.2 {o X Y o o o o o o} {o [X Y] o o o o...}
    3.3 {o o X Y o o o o o} {o o [X Y] o o o...}
    3.4 {o o o X Y o o o o} {...o o [X Y] o o o...}
    3.5 {o o o o X Y o o o} {...o o [X Y] o o o}
    3.6 {o o o o o X Y o o} {...o o o [X Y] o o}
    3.7 {o o o o o o X Y o} {...o o o o [X Y] o}
    3.8 {o o o o o o o X Y} {...o o o o o [X Y]}

} {
  do_snippet_test 2.$tn $doc "X + Y" $res
}

  } {
    do_snippet_test 2.$tn $doc "X + Y" $res
  }
}

} ;# foreach_detail_mode 

finish_test

#      ... WHERE fts MATCH ? ORDER BY bm25(fts) [ASC|DESC]
#
# and
#
#      ... WHERE fts MATCH ? ORDER BY rank [ASC|DESC]
#

foreach_detail_mode $testprefix {

do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(x, y, z);
  CREATE VIRTUAL TABLE t1 USING fts5(x, y, z, detail=%DETAIL%);
}

do_test 1.1 {
  foreach {x y z} {
    {j s m y m r n l u k} {z k f u z g h s w g} {r n o s s b v n w w}
    {m v g n d x q r r s} {q t d a q a v l h j} {s k l f s i n v q v}
    {m f f d h h s o h a} {y e v r q i u m h d} {b c k q m z l z h n}

foreach {tn expr} {
  2.1 a
  2.2 b
  2.3 c
  2.4 d

  2.5 {"m m"}
  2.6 {e + s}

  3.0 {a AND b}
  3.1 {a OR b}
  3.2 {b OR c AND d}
} {
  do_fts5ag_test $tn $expr
}

if {[detail_is_full]} {
  foreach {tn expr} {
    4.1 {"m m"}
    4.2 {e + s}
  3.3 {NEAR(c d)}
} {
  do_fts5ag_test $tn $expr

    4.3 {NEAR(c d)}
  } {
    do_fts5ag_test $tn $expr
  }
  if {[set_test_counter errors]} break
}

} ;# foreach_detail_mode


finish_test

set testprefix fts5ah

# If SQLITE_ENABLE_FTS5 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}

foreach_detail_mode $testprefix {

#-------------------------------------------------------------------------
# This file contains tests for very large doclists.
#

set Y [list]
set W [list]
do_test 1.0 {
  execsql { CREATE VIRTUAL TABLE t1 USING fts5(a) }
  execsql { CREATE VIRTUAL TABLE t1 USING fts5(a, detail=%DETAIL%) }
  execsql { INSERT INTO t1(t1, rank) VALUES('pgsz', 128) }
  set v {w w w w w w w w w w w w w w w w w w w w}
  execsql { INSERT INTO t1(rowid, a) VALUES(0, $v) }
  for {set i 1} {$i <= 10000} {incr i} {
    set v {x x x x x x x x x x x x x x x x x x x x}
    if {($i % 2139)==0} {lset v 3 Y ; lappend Y $i}
    if {($i % 1577)==0} {lset v 5 W ; lappend W $i}

  expr [reads] - $nRead
}

do_test 1.4 {
  set nRead [reads]
  execsql { SELECT rowid FROM t1 WHERE t1 MATCH 'x' }
  set nReadX [expr [reads] - $nRead]
  #puts -nonewline "(nReadX=$nReadX)"
  if {[detail_is_full]} { set expect 1000 }
  if {[detail_is_col]}  { set expect 250 }
  if {[detail_is_none]} { set expect 80 }

  expr $nReadX>1000
  expr $nReadX>$expect
} {1}

do_test 1.5 {
  set fwd [execsql_reads {SELECT rowid FROM t1 WHERE t1 MATCH 'x' }]
  set bwd [execsql_reads {
    SELECT rowid FROM t1 WHERE t1 MATCH 'x' ORDER BY 1 ASC 
  }]
  expr {$bwd < $fwd + 12}
} {1}

foreach {tn q res} "
  1 { SELECT rowid FROM t1 WHERE t1 MATCH 'w + x'   }  [list $W]
  2 { SELECT rowid FROM t1 WHERE t1 MATCH 'x + w'   }  [list $W]
  3 { SELECT rowid FROM t1 WHERE t1 MATCH 'x AND w' }  [list $W]
  4 { SELECT rowid FROM t1 WHERE t1 MATCH 'y AND x' }  [list $Y]
" {
  if {[detail_is_full]==0 && ($tn==1 || $tn==2)} continue

  if {[detail_is_full]} { set ratio 8 }
  if {[detail_is_col]}  { set ratio 4 }
  if {[detail_is_none]} { set ratio 2 }

  do_test 1.6.$tn.1 {
    set n [execsql_reads $q]
    #puts -nonewline "(n=$n nReadX=$nReadX)"
    expr {$n < ($nReadX / 8)}
    expr {$n < ($nReadX / $ratio)}
  } {1}

  do_test 1.6.$tn.2 {
    set n [execsql_reads "$q ORDER BY rowid DESC"]
    #puts -nonewline "(n=$n nReadX=$nReadX)"
    expr {$n < ($nReadX / 8)}
    expr {$n < ($nReadX / $ratio)}
  } {1}

  do_execsql_test 1.6.$tn.3 $q [lsort -int -incr $res]
  do_execsql_test 1.6.$tn.4 "$q ORDER BY rowid DESC" [lsort -int -decr $res]
}

#-------------------------------------------------------------------------
# Now test that adding range constraints on the rowid field reduces the
# number of pages loaded from disk.
#
foreach {tn fraction tail cnt} {
  1 0.6 {rowid > 5000} 5000
  2 0.2 {rowid > 9000} 1000
  3 0.2 {rowid < 1000}  999
  4 0.2 {rowid BETWEEN 4000 AND 5000}  1001
  5 0.6 {rowid >= 5000} 5001
  6 0.2 {rowid >= 9000} 1001
  7 0.2 {rowid <= 1000} 1000
  8 0.6 {rowid > '5000'} 5000
  9 0.2 {rowid > '9000'} 1000
  1  0.6 {rowid > 5000} 5000
  2  0.2 {rowid > 9000} 1000
  3  0.2 {rowid < 1000}  999
  4  0.2 {rowid BETWEEN 4000 AND 5000}  1001
  5  0.6 {rowid >= 5000} 5001
  6  0.2 {rowid >= 9000} 1001
  7  0.2 {rowid <= 1000} 1000
  8  0.6 {rowid > '5000'} 5000
  9  0.2 {rowid > '9000'} 1000
  10 0.1 {rowid = 444} 1
} {
  set q "SELECT rowid FROM t1 WHERE t1 MATCH 'x' AND $tail"
  set n [execsql_reads $q]
  set ret [llength [execsql $q]]

  # Because the position lists for 'x' are quite long in this db, the 
  # advantage is a bit smaller in detail=none mode. Update $fraction to 
  # reflect this.
  if {[detail_is_none] && $fraction<0.5} { set fraction [expr $fraction*2] }

  do_test "1.7.$tn.asc.(n=$n ret=$ret)" {
    expr {$n < ($fraction*$nReadX) && $ret==$cnt}
  } {1}

  set q "SELECT rowid FROM t1 WHERE t1 MATCH 'x' AND $tail ORDER BY rowid DESC"
  set n [execsql_reads $q]
  set ret [llength [execsql $q]]
  do_test "1.7.$tn.desc.(n=$n ret=$ret)" {
    expr {$n < 2*$fraction*$nReadX && $ret==$cnt}
  } {1}
}

do_execsql_test 1.8.1 {
  SELECT count(*) FROM t1 WHERE t1 MATCH 'x' AND +rowid < 'text';
} {10000}
do_execsql_test 1.8.2 {
  SELECT count(*) FROM t1 WHERE t1 MATCH 'x' AND rowid < 'text';
} {10000}

} ;# foreach_detail_mode

#db eval {SELECT rowid, fts5_decode(rowid, block) aS r FROM t1_data} {puts $r}

finish_test

# If SQLITE_ENABLE_FTS5 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}

foreach_detail_mode $testprefix {

do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(a);
  CREATE VIRTUAL TABLE t1 USING fts5(a, detail=%DETAIL%);
} {}

do_execsql_test 1.1 {
  BEGIN;
    INSERT INTO t1 VALUES('a b c');
    INSERT INTO t1 VALUES('d e f');
    SAVEPOINT one;

      INSERT INTO t1 VALUES('s t u');
    ROLLBACK TO one;
  COMMIT;
}

do_execsql_test 1.2 {
  INSERT INTO t1(t1) VALUES('integrity-check');
}
}


finish_test

# If SQLITE_ENABLE_FTS5 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}

foreach_detail_mode $testprefix {

do_execsql_test 1.1 {
  CREATE VIRTUAL TABLE ft1 USING fts5(x);
  CREATE VIRTUAL TABLE ft1 USING fts5(x, detail=%DETAIL%);
  INSERT INTO ft1 VALUES('i d d a g i b g d d');
  INSERT INTO ft1 VALUES('h d b j c c g a c a');
  INSERT INTO ft1 VALUES('e j a e f h b f h h');
  INSERT INTO ft1 VALUES('j f h d g h i b d f');
  INSERT INTO ft1 VALUES('d c j d c j b c g e');
  INSERT INTO ft1 VALUES('i a d e g j g d a a');
  INSERT INTO ft1 VALUES('j f c e d a h j d b');
  INSERT INTO ft1 VALUES('i c c f a d g h j e');
  INSERT INTO ft1 VALUES('i d i g c d c h b f');
  INSERT INTO ft1 VALUES('g d a e h a b c f j');

  CREATE VIRTUAL TABLE ft2 USING fts5(x, detail=%DETAIL%);
  INSERT INTO ft2 VALUES('a b c d e f g h i j');
}

do_execsql_test 1.2 {
  SELECT highlight(ft1, 0, '[', ']') FROM ft1 WHERE ft1 MATCH 'e';
} {
  {[e] j a [e] f h b f h h}
  {d c j d c j b c g [e]}
  {i a d [e] g j g d a a}
  {j f c [e] d a h j d b}
  {i c c f a d g h j [e]}
  {g d a [e] h a b c f j}
}

do_execsql_test 1.3 {
  SELECT highlight(ft1, 0, '[', ']') FROM ft1 WHERE ft1 MATCH 'h + d';
} {
  {[h d] b j c c g a c a}
  {j f [h d] g h i b d f} 
}

do_execsql_test 1.4 {
  SELECT highlight(ft1, 0, '[', ']') FROM ft1 WHERE ft1 MATCH 'd + d';
} {
  {i [d d] a g i b g [d d]}
}

do_execsql_test 1.5 {
  SELECT highlight(ft1, 0, '[', ']') FROM ft1 WHERE ft1 MATCH 'e e e'
} {
  {[e] j a [e] f h b f h h}
  {d c j d c j b c g [e]}
  {i a d [e] g j g d a a}
  {j f c [e] d a h j d b}
  {i c c f a d g h j [e]}
  {g d a [e] h a b c f j}
}

do_execsql_test 1.6 {
  SELECT highlight(ft1, 0, '[', ']') FROM ft1 WHERE ft1 MATCH 'd + d d + d';
do_execsql_test 1.4 {
  SELECT highlight(ft2, 0, '[', ']') FROM ft2 WHERE ft2 MATCH 'f d'
} {
  {a b c [d] e [f] g h i j}
}

do_execsql_test 1.5 {
  SELECT highlight(ft2, 0, '[', ']') FROM ft2 WHERE ft2 MATCH 'd f'
} {
  {a b c [d] e [f] g h i j}
}

#-------------------------------------------------------------------------
# Tests below this point require detail=full.
#-------------------------------------------------------------------------
if {[detail_is_full]==0} continue


do_execsql_test 2.1 {
  SELECT highlight(ft1, 0, '[', ']') FROM ft1 WHERE ft1 MATCH 'h + d';
} {
  {[h d] b j c c g a c a}
  {j f [h d] g h i b d f} 
}

do_execsql_test 2.2 {
  SELECT highlight(ft1, 0, '[', ']') FROM ft1 WHERE ft1 MATCH 'd + d';
} {
  {i [d d] a g i b g [d d]}
}

do_execsql_test 2.1 {
do_execsql_test 2.3 {
  CREATE VIRTUAL TABLE ft2 USING fts5(x);
  INSERT INTO ft2 VALUES('a b c d e f g h i j');
  SELECT highlight(ft1, 0, '[', ']') FROM ft1 WHERE ft1 MATCH 'd + d d + d';
} {
  {i [d d] a g i b g [d d]}
}

do_execsql_test 2.2 {
do_execsql_test 2.4 {
  SELECT highlight(ft2, 0, '[', ']') FROM ft2 WHERE ft2 MATCH 'b+c+d c+d+e'
} {{a [b c d e] f g h i j}}

do_execsql_test 2.3 {
do_execsql_test 2.5 {
  SELECT highlight(ft2, 0, '[', ']') FROM ft2 WHERE ft2 MATCH 'b+c+d e+f+g'
} {
  {a [b c d] [e f g] h i j}
}

do_execsql_test 2.4 {
do_execsql_test 2.6 {
  SELECT highlight(ft2, 0, '[', ']') FROM ft2 WHERE ft2 MATCH 'b+c+d c'
} {
  {a [b c d] e f g h i j}
}

do_execsql_test 2.5 {
do_execsql_test 2.7 {
  SELECT highlight(ft2, 0, '[', ']') FROM ft2 WHERE ft2 MATCH 'b+c c+d+e'
} {
  {a [b c d e] f g h i j}
}

do_execsql_test 2.6.1 {
  SELECT highlight(ft2, 0, '[', ']') FROM ft2 WHERE ft2 MATCH 'f d'
} {
  {a b c [d] e [f] g h i j}
}

do_execsql_test 2.6.2 {
  SELECT highlight(ft2, 0, '[', ']') FROM ft2 WHERE ft2 MATCH 'd f'
} {
  {a b c [d] e [f] g h i j}
}

#-------------------------------------------------------------------------
# The example from the docs.
#
do_execsql_test 3.1 {
  -- Assuming this:
  CREATE VIRTUAL TABLE ft USING fts5(a);
  CREATE VIRTUAL TABLE ft USING fts5(a, detail=%DETAIL%);
  INSERT INTO ft VALUES('a b c x c d e');
  INSERT INTO ft VALUES('a b c c d e');
  INSERT INTO ft VALUES('a b c d e');

  -- The following SELECT statement returns these three rows:
  --   '[a b c] x [c d e]'
  --   '[a b c] [c d e]'
  --   '[a b c d e]'
  SELECT highlight(ft, 0, '[', ']') FROM ft WHERE ft MATCH 'a+b+c AND c+d+e';
} {
  {[a b c] x [c d e]}
  {[a b c] [c d e]}
  {[a b c d e]}
}

}

finish_test

# If SQLITE_ENABLE_FTS5 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}

foreach_detail_mode $testprefix {

do_execsql_test 1.1 {
  CREATE VIRTUAL TABLE ft1 USING fts5(x);
  CREATE VIRTUAL TABLE ft1 USING fts5(x, detail=%DETAIL%);
  SELECT * FROM ft1_config;
} {version 4}

do_execsql_test 1.2 {
  INSERT INTO ft1(ft1, rank) VALUES('pgsz', 32);
  SELECT * FROM ft1_config;
} {pgsz 32 version 4}

}

#-------------------------------------------------------------------------
# Assorted tests of the tcl interface for creating extension functions.
#

do_execsql_test 3.1 {
  CREATE VIRTUAL TABLE t1 USING fts5(x);
  CREATE VIRTUAL TABLE t1 USING fts5(x, detail=%DETAIL%);
  INSERT INTO t1 VALUES('q w e r t y');
  INSERT INTO t1 VALUES('y t r e w q');
}

proc argtest {cmd args} { return $args }
sqlite3_fts5_create_function db argtest argtest

do_execsql_test 3.4.1 {
  SELECT insttest(t1) FROM t1 WHERE t1 MATCH 'q'
} {
  {{0 0 0}}
  {{0 0 5}} 
}

if {[detail_is_full]} {
do_execsql_test 3.4.2 {
  SELECT insttest(t1) FROM t1 WHERE t1 MATCH 'r+e OR w'
} {
  {{1 0 1}}
  {{0 0 2} {1 0 4}} 
  do_execsql_test 3.4.2 {
    SELECT insttest(t1) FROM t1 WHERE t1 MATCH 'r+e OR w'
  } {
    {{1 0 1}}
    {{0 0 2} {1 0 4}} 
  }
}

proc coltest {cmd} {
  list [$cmd xColumnSize 0] [$cmd xColumnText 0]
}
sqlite3_fts5_create_function db coltest coltest

# Tests for remapping the "rank" column.
#
#   4.1.*: Mapped to a function with no arguments.
#   4.2.*: Mapped to a function with one or more arguments.
#

do_execsql_test 4.0 {
  CREATE VIRTUAL TABLE t2 USING fts5(a, b);
  CREATE VIRTUAL TABLE t2 USING fts5(a, b, detail=%DETAIL%);
  INSERT INTO t2 VALUES('a s h g s b j m r h', 's b p a d b b a o e');
  INSERT INTO t2 VALUES('r h n t a g r d d i', 'l d n j r c f t o q');
  INSERT INTO t2 VALUES('q k n i k c a a e m', 'c h n j p g s c i t');
  INSERT INTO t2 VALUES('h j g t r e l s g s', 'k q k c i i c k n s');
  INSERT INTO t2 VALUES('b l k h d n n n m i', 'p t i a r b t q o l');
  INSERT INTO t2 VALUES('k r i l j b g i p a', 't q c h a i m g n l');
  INSERT INTO t2 VALUES('a e c q n m o m d g', 'l c t g i s q g q e');

}

proc rowidplus {cmd ival} { 
  expr [$cmd xRowid] + $ival
}
sqlite3_fts5_create_function db rowidplus rowidplus

if {[detail_is_full]} {
do_execsql_test 4.2.1 {
  INSERT INTO t2(t2, rank) VALUES('rank', 'rowidplus(100) ');
  SELECT rowid, rank FROM t2 WHERE t2 MATCH 'o + q + g'
} {
  10 110
}
do_execsql_test 4.2.2 {
  INSERT INTO t2(t2, rank) VALUES('rank', 'rowidplus(111) ');
  SELECT rowid, rank FROM t2 WHERE t2 MATCH 'o + q + g'
} {
  10 121
}
  do_execsql_test 4.2.1 {
    INSERT INTO t2(t2, rank) VALUES('rank', 'rowidplus(100) ');
    SELECT rowid, rank FROM t2 WHERE t2 MATCH 'o + q + g'
  } {
    10 110
  }
  do_execsql_test 4.2.2 {
    INSERT INTO t2(t2, rank) VALUES('rank', 'rowidplus(111) ');
    SELECT rowid, rank FROM t2 WHERE t2 MATCH 'o + q + g'
  } {
    10 121
  }

do_execsql_test 4.2.3 {
  SELECT rowid, rank FROM t2 
  WHERE t2 MATCH 'o + q + g' AND rank MATCH 'rowidplus(112)'
} {
  10 122
  do_execsql_test 4.2.3 {
    SELECT rowid, rank FROM t2 
      WHERE t2 MATCH 'o + q + g' AND rank MATCH 'rowidplus(112)'
  } {
    10 122
  }
}

proc rowidmod {cmd imod} { 
  expr [$cmd xRowid] % $imod
}
sqlite3_fts5_create_function db rowidmod rowidmod
do_execsql_test 4.3.1 {
  CREATE VIRTUAL TABLE t3 USING fts5(x);
  CREATE VIRTUAL TABLE t3 USING fts5(x, detail=%DETAIL%);
  INSERT INTO t3 VALUES('a one');
  INSERT INTO t3 VALUES('a two');
  INSERT INTO t3 VALUES('a three');
  INSERT INTO t3 VALUES('a four');
  INSERT INTO t3 VALUES('a five');
  INSERT INTO t3(t3, rank) VALUES('rank', 'bm25()');
}

do_catchsql_test 4.4.3 {
  SELECT *, rank FROM t3 WHERE t3 MATCH 'a' AND rank MATCH 'xyz(3)' 
} {1 {no such function: xyz}}
do_catchsql_test 4.4.4 {
  SELECT *, rank FROM t3 WHERE t3 MATCH 'a' AND rank MATCH NULL
} {1 {parse error in rank function: }}

} ;# foreach_detail_mode


finish_test

# If SQLITE_ENABLE_FTS5 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}


set data {
    -4026076
    {n x w k b p x b n t t d s}     {f j j s p j o}               
    {w v i y r}                     {i p y s}                     
    {a o q v e n q r}               {q v g u c y a z y}           
    3995120
    {c}                             {e e w d t}                   

do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE tt USING fts5(a, b, c, d, e, f);
} {}

fts5_aux_test_functions db

proc matchdata {expr tbl collist {order ASC}} {

  set cols ""
  foreach e $collist {
    append cols ", '$e'"
  }

  set tclexpr [db one [subst -novar {
    SELECT fts5_expr_tcl(
      $expr, 'nearset $cols -pc ::pc' [set cols]
    )
  }]]
  set res [list]

  db eval "SELECT rowid, * FROM $tbl ORDER BY rowid $order" x {
    set cols [list]
    foreach col $x(*) {
      if {$col != "rowid"} { lappend cols $x($col) }
    }
    # set cols [list $a $b $c $d $e $f]
    set ::pc 0
    set rowdata [eval $tclexpr]
    if {$rowdata != ""} { lappend res $x(rowid) $rowdata }
  }

  set res
}

proc do_auto_test {tn tbl cols expr} { 
proc do_auto_test {tn tbl expr} {
  foreach order {asc desc} {
    set res [matchdata $expr $tbl $cols $order]
    set res [fts5_poslist_data $expr $tbl $order]
    set testname "$tn.[string range $order 0 0].rows=[expr [llength $res]/2]"

    set ::autotest_expr $expr
    do_execsql_test $testname [subst -novar {
      SELECT rowid, fts5_test_poslist([set tbl]) FROM [set tbl] 
      WHERE [set tbl] MATCH $::autotest_expr ORDER BY rowid [set order]
    }] $res
  }


}

#-------------------------------------------------------------------------
#

for {set fold 0} {$fold < 3} {incr fold} {
  switch $fold {

    B.4 { a OR (b AND {a b c}:c) }
    B.5 { a OR "b c" }
    B.6 { a OR b OR c }

    C.1 { a OR (b AND "b c") }
    C.2 { a OR (b AND "z c") }
  } {
    do_auto_test 3.$fold.$tn tt {a b c d e f} $expr
    do_auto_test 3.$fold.$tn tt $expr
  }
}

proc replace_elems {list args} {
  set ret $list
  foreach {idx elem} $args {
    set ret [lreplace $ret $idx $idx $elem]

  1 x    
  2 y    
  3 z

  4 {c1 : x} 5 {c2 : x} 6 {c3 : x}
  7 {c1 : y} 8 {c2 : y} 9 {c3 : y}
  10 {c1 : z} 11 {c2 : z} 12 {c3 : z}


} {
breakpoint
  do_auto_test 4.$tn yy {c1 c2 c3} $expr
  do_auto_test 4.$tn yy $expr
}



finish_test

# 2015 December 18
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#*************************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this script is testing the FTS5 module.
#

source [file join [file dirname [info script]] fts5_common.tcl]
set testprefix fts5detail

# If SQLITE_ENABLE_FTS5 is not defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}

fts5_aux_test_functions db

#--------------------------------------------------------------------------
# Simple tests.
#
do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(a, b, c, detail=col);
  INSERT INTO t1 VALUES('h d g', 'j b b g b', 'i e i d h g g'); -- 1
  INSERT INTO t1 VALUES('h j d', 'j h d a h', 'f d d g g f b'); -- 2
  INSERT INTO t1 VALUES('j c i', 'f f h e f', 'c j i j c h f'); -- 3
  INSERT INTO t1 VALUES('e g g', 'g e d h i', 'e d b e g d c'); -- 4
  INSERT INTO t1 VALUES('b c c', 'd i h a f', 'd i j f a b c'); -- 5
  INSERT INTO t1 VALUES('e d e', 'b c j g d', 'a i f d h b d'); -- 6
  INSERT INTO t1 VALUES('g h e', 'b c d i d', 'e f c i f i c'); -- 7
  INSERT INTO t1 VALUES('c f j', 'j j i e a', 'h a c f d h e'); -- 8
  INSERT INTO t1 VALUES('a h i', 'c i a f a', 'c f d h g d g'); -- 9
  INSERT INTO t1 VALUES('j g g', 'e f e f f', 'h j b i c g e'); -- 10
}

do_execsql_test 1.1 {
  INSERT INTO t1(t1) VALUES('integrity-check');
}

foreach {tn match res} {
  1 "a:a" {9}
  2 "b:g" {1 4 6}
  3 "c:h" {1 3 6 8 9 10}
} {
  do_execsql_test 1.2.$tn.1 {
    SELECT rowid FROM t1($match);
  } $res

  do_execsql_test 1.2.$tn.2 {
    SELECT rowid FROM t1($match || '*');
  } $res
}

do_catchsql_test 1.3.1 {
  SELECT rowid FROM t1('h + d');
} {1 {fts5: phrase queries are not supported (detail!=full)}}

do_catchsql_test 1.3.2 {
  SELECT rowid FROM t1('NEAR(h d)');
} {1 {fts5: NEAR queries are not supported (detail!=full)}}


#-------------------------------------------------------------------------
# integrity-check with both detail= and prefix= options.
#
do_execsql_test 2.0 {
  CREATE VIRTUAL TABLE t2 USING fts5(a, detail=col, prefix="1");
  INSERT INTO t2(a) VALUES('aa ab');
}

#db eval {SELECT rowid, fts5_decode(rowid, block) aS r FROM t2_data} {puts $r}

do_execsql_test 2.1 {
  INSERT INTO t2(t2) VALUES('integrity-check');
}

do_execsql_test 2.2 {
  SELECT fts5_test_poslist(t2) FROM t2('aa');
} {0.0.0}

set ::pc 0
#puts [nearset {{ax bx cx}} -pc ::pc -near 10 -- b*]
#exit

#-------------------------------------------------------------------------
# Check that the xInstCount, xInst, xPhraseFirst and xPhraseNext APIs
# work with detail=col tables.
#
set data {
  1  {abb aca aca} {aba bab aab aac caa} {abc cbc ccb bcc bab ccb aca}
  2  {bca aca acb} {ccb bcc bca aab bcc} {bab aaa aac cbb bba aca abc}
  3  {cca abc cab} {aab aba bcc cac baa} {bab cbb acb aba aab ccc cca}
  4  {ccb bcb aba} {aba bbb bcc cac bbb} {cbb aaa bca bcc aab cac aca}
  5  {bca bbc cac} {aba cbb cac cca aca} {cab acb cbc ccb cac bbb bcb}
  6  {acc bba cba} {bab bbc bbb bcb aca} {bca ccc cbb aca bac ccc ccb}
  7  {aba bab aaa} {abb bca aac bcb bcc} {bcb bbc aba aaa cba abc acc}
  8  {cab aba aaa} {ccb aca caa bbc bcc} {aaa abc ccb bbb cac cca abb}
  9  {bcb bab bac} {bcb cba cac bbb abc} {aba aca cbb acb abb ccc ccb}
  10 {aba aab ccc} {abc ccc bcc cab bbb} {aab bcc cbb ccc aaa bac baa}
  11 {bab acb cba} {aac cab cab bca cbc} {aab cbc aac baa ccb acc cac}
  12 {ccc cbb cbc} {aaa aab bcc aac bbc} {cbc cbc bac bac ccc bbc acc}
  13 {cab bbc abc} {bbb bab bba aca bab} {baa bbb aab bbb ccb bbb ccc}
  14 {bbc cab caa} {acb aac abb cba acc} {cba bba bba acb abc abb baa}
  15 {aba cca bcc} {aaa acb abc aab ccb} {cca bcb acc aaa caa cca cbc}
  16 {bcb bba aba} {cbc acb cab caa ccb} {aac aaa bbc cab cca cba abc}
  17 {caa cbb acc} {ccb bcb bca aaa bcc} {bbb aca bcb bca cbc cbc cca}
  18 {cbb bbc aac} {ccc bbc aaa aab baa} {cab cab cac cca bbc abc bbc}
  19 {ccc acc aaa} {aab cbb bca cca caa} {bcb aca aca cab acc bac bcc}
  20 {aab ccc bcb} {bbc cbb bbc aaa bcc} {cbc aab ccc aaa bcb bac cbc}
  21 {aba cab ccc} {bbc cbc cba acc bbb} {acc aab aac acb aca bca acb}
  22 {bcb bca baa} {cca bbc aca ccb cbb} {aab abc bbc aaa cab bcc bcc}
  23 {cac cbb caa} {bbc aba bbb bcc ccb} {bbc bbb cab bbc cac abb acc}
  24 {ccb acb caa} {cab bba cac bbc aac} {aac bca abc cab bca cab bcb}
  25 {bbb aca bca} {bcb acc ccc cac aca} {ccc acb acc cac cac bba bbc}
  26 {bab acc caa} {caa cab cac bac aca} {aba cac caa acc bac ccc aaa}
  27 {bca bca aaa} {ccb aca bca aaa baa} {bab acc aaa cca cba cca bac}
  28 {ccb cac cac} {bca abb bba bbc baa} {aca ccb aac cab ccc cab caa}
  29 {abc bca cab} {cac cbc cbb ccc bcc} {bcc aaa aaa acc aac cac aac}
  30 {aca acc acb} {aab aac cbb caa acb} {acb bbc bbc acc cbb bbc aac}
  31 {aba aca baa} {aca bcc cab bab acb} {bcc acb baa bcb bbc acc aba}
  32 {abb cbc caa} {cba abb bbb cbb aca} {bac aca caa cac caa ccb bbc}
  33 {bcc bcb bcb} {cca cab cbc abb bab} {caa bbc aac bbb cab cba aaa}
  34 {caa cab acc} {ccc ccc bcc acb bcc} {bac bba aca bcb bba bcb cac}
  35 {bac bcb cba} {bcc acb bbc cba bab} {abb cbb abc abc bac acc cbb}
  36 {cab bab ccb} {bca bba bab cca acc} {acc aab bcc bac acb cbb caa}
  37 {aca cbc cab} {bba aac aca aac aaa} {baa cbb cba aba cab bca bcb}
  38 {acb aab baa} {baa bab bca bbc bbb} {abc baa acc aba cab baa cac}
  39 {bcb aac cba} {bcb baa caa cac bbc} {cbc ccc bab ccb bbb caa aba}
  40 {cba ccb abc} {cbb caa cba aac bab} {cbb bbb bca bbb bac cac bca}
}

set data {
  1  {abb aca aca} {aba bab aab aac caa} {abc cbc ccb bcc bab ccb aca}
}

proc matchdata {expr {bAsc 1}} {

  set tclexpr [db one {
    SELECT fts5_expr_tcl($expr, 'nearset $cols -pc ::pc', 'x', 'y', 'z')
  }]
  set res [list]

  #puts "$expr -> $tclexpr"
  foreach {id x y z} $::data {
    set cols [list $x $y $z]
    set ::pc 0
    #set hits [lsort -command instcompare [eval $tclexpr]]
    set hits [eval $tclexpr]
    if {[llength $hits]>0} {
      lappend res [list $id $hits]
    }
  }

  if {$bAsc} {
    set res [lsort -integer -increasing -index 0 $res]
  } else {
    set res [lsort -integer -decreasing -index 0 $res]
  }

  return [concat {*}$res]
}

foreach {tn tbl} {
  1 { CREATE VIRTUAL TABLE t3 USING fts5(x, y, z, detail=col) }
  2 { CREATE VIRTUAL TABLE t3 USING fts5(x, y, z, detail=none) }
} {
  reset_db
  fts5_aux_test_functions db
  execsql $tbl
  foreach {id x y z} $data {
    execsql { INSERT INTO t3(rowid, x, y, z) VALUES($id, $x, $y, $z) }
  }
  foreach {tn2 expr} {
    1 aaa    2 ccc    3 bab    4 aac
    5 aa*    6 cc*    7 ba*    8 aa*
    9 a*     10 b*   11 c*
  } {

    set res [matchdata $expr]

    do_execsql_test 3.$tn.$tn2.1 {
      SELECT rowid, fts5_test_poslist(t3) FROM t3($expr)
    } $res

    do_execsql_test 3.$tn.$tn2.2 {
      SELECT rowid, fts5_test_poslist2(t3) FROM t3($expr)
    } $res
  }
}

#-------------------------------------------------------------------------
# Simple tests for detail=none tables.
#
do_execsql_test 4.0 {
  CREATE VIRTUAL TABLE t4 USING fts5(a, b, c, detail=none);
  INSERT INTO t4 VALUES('a b c', 'b c d', 'e f g');
  INSERT INTO t4 VALUES('1 2 3', '4 5 6', '7 8 9');
}

do_catchsql_test 4.1 {
  SELECT * FROM t4('a:a')
} {1 {fts5: column queries are not supported (detail=none)}}

#-------------------------------------------------------------------------
# Test that for the same content detail=none uses less space than 
# detail=col, and that detail=col uses less space than detail=full
#
reset_db
do_test 5.1 {
  foreach {tbl detail} {t1 none t2 col t3 full} {
    execsql "CREATE VIRTUAL TABLE $tbl USING fts5(x, y, z, detail=$detail)"
    foreach {rowid x y z} $::data {
      execsql "INSERT INTO $tbl (rowid, x, y, z) VALUES(\$rowid, \$x, \$y, \$z)"
    }
  }
} {}

do_execsql_test 5.2 {
  SELECT 
    (SELECT sum(length(block)) from t1_data) <
    (SELECT sum(length(block)) from t2_data)
} {1}

do_execsql_test 5.3 {
  SELECT 
    (SELECT sum(length(block)) from t2_data) <
    (SELECT sum(length(block)) from t3_data)
} {1}



finish_test

}

if { $tcl_platform(wordSize)<8 } {
  finish_test
  return
}

if 1 {
foreach_detail_mode $testprefix {

proc do_fb_test {tn sql res} {
  set res2 [lsort -integer -decr $res]
  uplevel [list do_execsql_test $tn.1 $sql $res]
  uplevel [list do_execsql_test $tn.2 "$sql ORDER BY rowid DESC" $res2]
}

# This test populates the FTS5 table containing $nEntry entries. Rows are 
# This test populates the FTS5 table with $nEntry entries. Rows are 
# numbered from 0 to ($nEntry-1). The rowid for row $i is:
#
#   ($iFirst + $i*$nStep)
#
# Each document is of the form "a b c a b c a b c...". If the row number ($i)
# is an integer multiple of $spc1, then an "x" token is appended to the
# document. If it is *also* a multiple of $spc2, a "y" token is also appended.

  
  do_fb_test $tn.3.1 { SELECT rowid FROM t1 WHERE t1 MATCH 'a AND x' } $xdoc
  do_fb_test $tn.3.2 { SELECT rowid FROM t1 WHERE t1 MATCH 'x AND a' } $xdoc
  
  do_fb_test $tn.4.1 { SELECT rowid FROM t1 WHERE t1 MATCH 'a AND y' } $ydoc
  do_fb_test $tn.4.2 { SELECT rowid FROM t1 WHERE t1 MATCH 'y AND a' } $ydoc
  
  if {[detail_is_full]} {
  do_fb_test $tn.5.1 { 
    SELECT rowid FROM t1 WHERE t1 MATCH 'a + b + c + x' } $xdoc
  do_fb_test $tn.5.2 { 
    SELECT rowid FROM t1 WHERE t1 MATCH 'b + c + x + y' } $ydoc
    do_fb_test $tn.5.1 { 
      SELECT rowid FROM t1 WHERE t1 MATCH 'a + b + c + x' } $xdoc
    do_fb_test $tn.5.2 { 
      SELECT rowid FROM t1 WHERE t1 MATCH 'b + c + x + y' } $ydoc
  }
}


foreach {tn pgsz} {
  1 32
  2 200
} {
  do_execsql_test $tn.0 { 
    DROP TABLE IF EXISTS t1;
    CREATE VIRTUAL TABLE t1 USING fts5(x);
    CREATE VIRTUAL TABLE t1 USING fts5(x, detail=%DETAIL%);
    INSERT INTO t1(t1, rank) VALUES('pgsz', $pgsz);
  }

  do_dlidx_test1 1.$tn.1     10 100 10000 0 1000
  do_dlidx_test1 1.$tn.2     10 10  10000 0 128
  do_dlidx_test1 1.$tn.3     10 10  66    0 36028797018963970
  do_dlidx_test1 1.$tn.4     10 10  50    0 150000000000000000
  do_dlidx_test1 1.$tn.5     10 10  200   0 [expr 1<<55]
  do_dlidx_test1 1.$tn.6      10 10  30    0 [expr 1<<58]
}

proc do_dlidx_test2 {tn nEntry iFirst nStep} {
  set str [string repeat "a " 500]
  execsql {
    BEGIN;
    DROP TABLE IF EXISTS t1;
    CREATE VIRTUAL TABLE t1 USING fts5(x);
    CREATE VIRTUAL TABLE t1 USING fts5(x, detail=%DETAIL%);
    INSERT INTO t1(t1, rank) VALUES('pgsz', 64);
    INSERT INTO t1 VALUES('b a');

    WITH iii(ii, i) AS (
      SELECT 1,     $iFirst UNION ALL 
      SELECT ii+1, i+$nStep FROM iii WHERE ii<$nEntry
    )

  do_execsql_test $tn.2 {
    SELECT rowid FROM t1 WHERE t1 MATCH 'b AND a' ORDER BY rowid DESC
  } {1}
}

do_dlidx_test2 2.1 [expr 20] [expr 1<<57] [expr (1<<57) + 128]

}

#--------------------------------------------------------------------
#
reset_db

set ::vocab [list \
  IteratorpItercurrentlypointstothefirstrowidofadoclist \
  Thereisadoclistindexassociatedwiththefinaltermonthecurrent \

    lappend ret [lindex $vocab [expr $i % $nVocab]]
  }
  set ret
}
db func rnddoc rnddoc

do_execsql_test 3.1 {
  CREATE VIRTUAL TABLE abc USING fts5(a);
  CREATE VIRTUAL TABLE abc USING fts5(a, detail=%DETAIL%);
  INSERT INTO abc(abc, rank) VALUES('pgsz', 32);

  INSERT INTO abc VALUES ( rnddoc() );
  INSERT INTO abc VALUES ( rnddoc() );
  INSERT INTO abc VALUES ( rnddoc() );
  INSERT INTO abc VALUES ( rnddoc() );

set v [lindex $vocab 0]
set i 0
foreach v $vocab {
  do_execsql_test 3.3.[incr i] {
    SELECT rowid FROM abc WHERE abc MATCH $v
  } {1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16}
}

} ;# foreach_detail_mode



finish_test

  6  {abc AND ""}                     {"abc"}
  7  {"" OR abc}                      {"abc"}
  8  {"" NOT abc}                     {"abc"}
  9  {"" AND abc}                     {"abc"}
  10 {abc + "" + def}                 {"abc" + "def"}
  11 {abc "" def}                     {"abc" AND "def"}
  12 {r+e OR w}                       {"r" + "e" OR "w"}

  13 {a AND b NOT c}                  {"a" AND ("b" NOT "c")}
  14 {a OR b NOT c}                   {"a" OR ("b" NOT "c")}
  15 {a NOT b AND c}                  {("a" NOT "b") AND "c"}
  16 {a NOT b OR c}                   {("a" NOT "b") OR "c"}

  17 {a AND b OR c}                   {("a" AND "b") OR "c"}
  18 {a OR b AND c}                   {"a" OR ("b" AND "c")}

} {
  do_execsql_test 1.$tn {SELECT fts5_expr($expr)} [list $res]
}

do_catchsql_test 2.1 {
  SELECT fts5_expr()
} {1 {wrong number of arguments to function fts5_expr}}

# 2015 September 3
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#*************************************************************************
#
# This file is focused on OOM errors.
#

source [file join [file dirname [info script]] fts5_common.tcl]
source $testdir/malloc_common.tcl
set testprefix fts5fault8

# If SQLITE_ENABLE_FTS3 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}

foreach_detail_mode $testprefix {

if {[detail_is_none]==0} continue

fts5_aux_test_functions db
do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(a, b, detail=%DETAIL%);
  INSERT INTO t1 VALUES('a b c d', '1 2 3 4');
  INSERT INTO t1 VALUES('a b a b', NULL);
  INSERT INTO t1 VALUES(NULL, '1 2 1 2');
}

do_faultsim_test 1 -faults oom-t* -body {
  execsql { 
    SELECT rowid, fts5_test_poslist(t1) FROM t1 WHERE t1 MATCH 'b OR 2' 
  }
} -test {
  faultsim_test_result {0 {1 {0.0.1 1.1.1} 2 {0.0.1 0.0.3} 3 {1.1.1 1.1.3}}} \
                       {1 SQLITE_NOMEM}
}

}

finish_test

source [file join [file dirname [info script]] fts5_common.tcl]
set testprefix fts5matchinfo

# If SQLITE_ENABLE_FTS5 is not defined, omit this file.
ifcapable !fts5 { finish_test ; return }

foreach_detail_mode $testprefix {

proc mit {blob} {
  set scan(littleEndian) i*
  set scan(bigEndian) I*
  binary scan $blob $scan($::tcl_platform(byteOrder)) r
  return $r
}
db func mit mit

sqlite3_fts5_register_matchinfo db

do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(content);
  CREATE VIRTUAL TABLE t1 USING fts5(content, detail=%DETAIL%);
} 

do_execsql_test 1.1 {
  INSERT INTO t1(content) VALUES('I wandered lonely as a cloud');
  INSERT INTO t1(content) VALUES('That floats on high o''er vales and hills,');
  INSERT INTO t1(content) VALUES('When all at once I saw a crowd,');
  INSERT INTO t1(content) VALUES('A host, of golden daffodils,');
  SELECT mit(matchinfo(t1)) FROM t1 WHERE t1 MATCH 'I';
} {{1 1 1 2 2} {1 1 1 2 2}}

# Now create an FTS4 table that does not specify matchinfo=fts3.
#
do_execsql_test 1.2 {
  CREATE VIRTUAL TABLE t2 USING fts5(content);
  CREATE VIRTUAL TABLE t2 USING fts5(content, detail=%DETAIL%);
  INSERT INTO t2 SELECT * FROM t1;
  SELECT mit(matchinfo(t2)) FROM t2 WHERE t2 MATCH 'I';
} {{1 1 1 2 2} {1 1 1 2 2}}


#--------------------------------------------------------------------------
# Proc [do_matchinfo_test] is used to test the FTSX matchinfo() function.

  set res [list]
  foreach elem $list_of_lists {
    lappend res [list {*}$elem]
  }
  return $res
}

# Similar to [do_matchinfo_test], except that this is a no-op if the FTS5
# mode is not detail=full.

#
proc do_matchinfo_p_test {tn tbl expr results} {
  if {[detail_is_full]} {
    uplevel [list do_matchinfo_test $tn $tbl $expr $results]
  }
}

do_execsql_test 4.1.0 {
  CREATE VIRTUAL TABLE t4 USING fts5(x, y);
  CREATE VIRTUAL TABLE t4 USING fts5(x, y, detail=%DETAIL%);
  INSERT INTO t4 VALUES('a b c d e', 'f g h i j');
  INSERT INTO t4 VALUES('f g h i j', 'a b c d e');
}

do_matchinfo_test 4.1.1 t4 {t4 MATCH 'a b c'} {
  s {{3 0} {0 3}}
}

  s {{3 0} {0 3}}

  xxxxxxxxxxxxxxxxxx - pcx - xpc - ccc - pppxpcpcx - laxnpc -
  xpxsscplax -
}

do_matchinfo_test 4.1.2 t4 {t4 MATCH '"g h i"'} {
do_matchinfo_p_test 4.1.2 t4 {t4 MATCH '"g h i"'} {
  p {1 1}
  c {2 2}
  x {
    {0 1 1   1 1 1}
    {1 1 1   0 1 1}
  }
  n {2 2}
  l {{5 5} {5 5}}
  a {{5 5} {5 5}}

  s {{0 1} {1 0}}

  xxxxxxxxxxxxxxxxxx - pcx - xpc - ccc - pppxpcpcx - laxnpc -
  sxsxs -
}

do_matchinfo_test 4.1.3 t4 {t4 MATCH 'a b'}     { s {{2 0} {0 2}} }
do_matchinfo_test 4.1.4 t4 {t4 MATCH '"a b" c'} { s {{2 0} {0 2}} }
do_matchinfo_test 4.1.5 t4 {t4 MATCH 'a "b c"'} { s {{2 0} {0 2}} }
do_matchinfo_p_test 4.1.4 t4 {t4 MATCH '"a b" c'} { s {{2 0} {0 2}} }
do_matchinfo_p_test 4.1.5 t4 {t4 MATCH 'a "b c"'} { s {{2 0} {0 2}} }
do_matchinfo_test 4.1.6 t4 {t4 MATCH 'd d'}     { s {{1 0} {0 1}} }
do_matchinfo_test 4.1.7 t4 {t4 MATCH 'f OR abcd'} {
  x { 
    {0 1 1  1 1 1  0 0 0  0 0 0} 
    {1 1 1  0 1 1  0 0 0  0 0 0}
  }
}
do_matchinfo_test 4.1.8 t4 {t4 MATCH 'f NOT abcd'} {
  x { 
    {0 1 1  1 1 1  0 0 0  0 0 0}
    {1 1 1  0 1 1  0 0 0  0 0 0}
  }
}

do_execsql_test 4.2.0 {
  CREATE VIRTUAL TABLE t5 USING fts5(content);
  CREATE VIRTUAL TABLE t5 USING fts5(content, detail=%DETAIL%);
  INSERT INTO t5 VALUES('a a a a a');
  INSERT INTO t5 VALUES('a b a b a');
  INSERT INTO t5 VALUES('c b c b c');
  INSERT INTO t5 VALUES('x x x x x');
}
do_matchinfo_test 4.2.1 t5 {t5 MATCH 'a a'}         { 
  x {{5 8 2   5 8 2} {3 8 2   3 8 2}}
  s {2 1} 
}
do_matchinfo_test 4.2.2 t5 {t5 MATCH 'a b'}         { s {2} }
do_matchinfo_test 4.2.3 t5 {t5 MATCH 'a b a'}       { s {3} }
do_matchinfo_test 4.2.4 t5 {t5 MATCH 'a a a'}       { s {3 1} }
do_matchinfo_test 4.2.5 t5 {t5 MATCH '"a b" "a b"'} { s {2} }
do_matchinfo_p_test 4.2.5 t5 {t5 MATCH '"a b" "a b"'} { s {2} }
do_matchinfo_test 4.2.6 t5 {t5 MATCH 'a OR b'}      { s {1 2 1} }

do_execsql_test 4.3.0 "INSERT INTO t5 VALUES('x y [string repeat {b } 50000]')";

# It used to be that the second 'a' token would be deferred. That doesn't
# work any longer.
if 0 {
  do_matchinfo_test 4.3.1 t5 {t5 MATCH 'a a'} { 
    x {{5 8 2   5 5 5} {3 8 2   3 5 5}}
    s {2 1} 
  }
}

do_matchinfo_test 4.3.2 t5 {t5 MATCH 'a b'}         { s {2} }
do_matchinfo_test 4.3.3 t5 {t5 MATCH 'a b a'}       { s {3} }
do_matchinfo_test 4.3.4 t5 {t5 MATCH 'a a a'}       { s {3 1} }
do_matchinfo_test 4.3.5 t5 {t5 MATCH '"a b" "a b"'} { s {2} }
do_matchinfo_p_test 4.3.5 t5 {t5 MATCH '"a b" "a b"'} { s {2} }
do_matchinfo_test 4.3.6 t5 {t5 MATCH 'a OR b'}      { s {1 2 1 1} }

do_execsql_test 4.4.0.1 { INSERT INTO t5(t5) VALUES('optimize') }

do_matchinfo_test 4.4.2 t5 {t5 MATCH 'a b'}         { s {2} }
do_matchinfo_test 4.4.1 t5 {t5 MATCH 'a a'}         { s {2 1} }
do_matchinfo_test 4.4.2 t5 {t5 MATCH 'a b'}         { s {2} }
do_matchinfo_test 4.4.3 t5 {t5 MATCH 'a b a'}       { s {3} }
do_matchinfo_test 4.4.4 t5 {t5 MATCH 'a a a'}       { s {3 1} }
do_matchinfo_test 4.4.5 t5 {t5 MATCH '"a b" "a b"'} { s {2} }
do_matchinfo_p_test 4.4.5 t5 {t5 MATCH '"a b" "a b"'} { s {2} }

do_execsql_test 4.5.0 {
  CREATE VIRTUAL TABLE t6 USING fts5(a, b, c);
  CREATE VIRTUAL TABLE t6 USING fts5(a, b, c, detail=%DETAIL%);
  INSERT INTO t6 VALUES('a', 'b', 'c');
}
do_matchinfo_test 4.5.1 t6 {t6 MATCH 'a b c'}       { s {{1 1 1}} }


#-------------------------------------------------------------------------
# Test the outcome of matchinfo() when used within a query that does not
# use the full-text index (i.e. lookup by rowid or full-table scan).
#
do_execsql_test 7.1 {
  CREATE VIRTUAL TABLE t10 USING fts5(content);
  CREATE VIRTUAL TABLE t10 USING fts5(content, detail=%DETAIL%);
  INSERT INTO t10 VALUES('first record');
  INSERT INTO t10 VALUES('second record');
}
do_execsql_test 7.2 {
  SELECT typeof(matchinfo(t10)), length(matchinfo(t10)) FROM t10;
} {blob 8 blob 8}
do_execsql_test 7.3 {

# This was causing a problem at one point in the obscure case where the
# total number of bytes of data stored in an fts3 table was greater than
# the number of rows. i.e. when the following query returns true:
#
#   SELECT sum(length(content)) < count(*) FROM fts4table;
#
do_execsql_test 8.1 {
  CREATE VIRTUAL TABLE t11 USING fts5(content);
  CREATE VIRTUAL TABLE t11 USING fts5(content, detail=%DETAIL%);
  INSERT INTO t11(t11, rank) VALUES('pgsz', 32);
  INSERT INTO t11 VALUES('quitealongstringoftext');
  INSERT INTO t11 VALUES('anotherquitealongstringoftext');
  INSERT INTO t11 VALUES('athirdlongstringoftext');
  INSERT INTO t11 VALUES('andonemoreforgoodluck');
}
do_test 8.2 {
  for {set i 0} {$i < 200} {incr i} {
    execsql { INSERT INTO t11 VALUES('') }
  }
  execsql { INSERT INTO t11(t11) VALUES('optimize') }
} {}
do_execsql_test 8.3 {
  SELECT mit(matchinfo(t11, 'nxa')) FROM t11 WHERE t11 MATCH 'a*'
} {{204 1 3 3 0} {204 1 3 3 0} {204 1 3 3 0}}

#-------------------------------------------------------------------------

if {[detail_is_full]} {
do_execsql_test 9.1 {
  CREATE VIRTUAL TABLE t12 USING fts5(content);
  INSERT INTO t12 VALUES('a b c d');
  SELECT mit(matchinfo(t12, 'x')) FROM t12 WHERE t12 MATCH 'NEAR(a d, 1) OR a';
} {{0 1 1 0 1 1 1 1 1}}
do_execsql_test 9.2 {
  INSERT INTO t12 VALUES('a d c d');
  SELECT mit(matchinfo(t12, 'x')) FROM t12 WHERE t12 MATCH 'NEAR(a d, 1) OR a';
} {
  {0 2 2 0 3 2 1 2 2} {1 2 2 1 3 2 1 2 2}
}
do_execsql_test 9.3 {
  INSERT INTO t12 VALUES('a d d a');
  SELECT mit(matchinfo(t12, 'x')) FROM t12 WHERE t12 MATCH 'NEAR(a d, 1) OR a';
} {
  {0 4 3 0 5 3 1 4 3} {1 4 3 1 5 3 1 4 3} {2 4 3 2 5 3 2 4 3}
  do_execsql_test 9.1 {
    CREATE VIRTUAL TABLE t12 USING fts5(content, detail=%DETAIL%);
    INSERT INTO t12 VALUES('a b c d');
    SELECT mit(matchinfo(t12,'x')) FROM t12 WHERE t12 MATCH 'NEAR(a d, 1) OR a';
  } {{0 1 1 0 1 1 1 1 1}}
  do_execsql_test 9.2 {
    INSERT INTO t12 VALUES('a d c d');
    SELECT mit(matchinfo(t12,'x')) FROM t12 WHERE t12 MATCH 'NEAR(a d, 1) OR a';
  } {
    {0 2 2 0 3 2 1 2 2} {1 2 2 1 3 2 1 2 2}
  }
  do_execsql_test 9.3 {
    INSERT INTO t12 VALUES('a d d a');
    SELECT mit(matchinfo(t12,'x')) FROM t12 WHERE t12 MATCH 'NEAR(a d, 1) OR a';
  } {
    {0 4 3 0 5 3 1 4 3} {1 4 3 1 5 3 1 4 3} {2 4 3 2 5 3 2 4 3}
  }
}

#---------------------------------------------------------------------------
# Test for a memory leak
#
do_execsql_test 10.1 {
  DROP TABLE t10;
  CREATE VIRTUAL TABLE t10 USING fts5(idx, value);
  CREATE VIRTUAL TABLE t10 USING fts5(idx, value, detail=%DETAIL%);
  INSERT INTO t10 values (1, 'one'),(2, 'two'),(3, 'three');
  SELECT t10.rowid, t10.*
    FROM t10
    JOIN (SELECT 1 AS idx UNION SELECT 2 UNION SELECT 3) AS x
   WHERE t10 MATCH x.idx
     AND matchinfo(t10) not null
   GROUP BY t10.rowid
   ORDER BY 1;
} {1 1 one 2 2 two 3 3 three}
  
#---------------------------------------------------------------------------
# Test the 'y' matchinfo flag
#
reset_db
sqlite3_fts5_register_matchinfo db
do_execsql_test 11.0 {
  CREATE VIRTUAL TABLE tt USING fts5(x, y);
  CREATE VIRTUAL TABLE tt USING fts5(x, y, detail=%DETAIL%);
  INSERT INTO tt VALUES('c d a c d d', 'e a g b d a');   -- 1
  INSERT INTO tt VALUES('c c g a e b', 'c g d g e c');   -- 2
  INSERT INTO tt VALUES('b e f d e g', 'b a c b c g');   -- 3
  INSERT INTO tt VALUES('a c f f g d', 'd b f d e g');   -- 4
  INSERT INTO tt VALUES('g a c f c f', 'd g g b c c');   -- 5
  INSERT INTO tt VALUES('g a c e b b', 'd b f b g g');   -- 6
  INSERT INTO tt VALUES('f d a a f c', 'e e a d c f');   -- 7

  7 "a OR (a AND b)" {
      1 {1 2 1 2 0 1}   2 {1 0 1 0 1 0}   3 {0 1 0 1 1 2}   4 {1 0 1 0 0 1}   
      5 {1 0 1 0 0 1}   6 {1 0 1 0 2 2}   7 {2 1 0 0 0 0}   8 {1 2 1 2 2 1}   
      9 {1 1 1 1 1 3}  10 {1 3 0 0 0 0}
  }

} {

  if {[string match *:* $expr] && [detail_is_none]} continue
  do_execsql_test 11.1.$tn.1  {
    SELECT rowid, mit(matchinfo(tt, 'y')) FROM tt WHERE tt MATCH $expr
  } $res

  set r2 [list]
  foreach {rowid L} $res {
    lappend r2 $rowid

reset_db
sqlite3_fts5_register_matchinfo db
db func mit mit

do_test 12.0 {
  set cols [list]
  for {set i 0} {$i < 50} {incr i} { lappend cols "c$i" }
  execsql "CREATE VIRTUAL TABLE tt USING fts5([join $cols ,])"
  execsql "CREATE VIRTUAL TABLE tt USING fts5([join $cols ,], detail=%DETAIL%)"
} {}

do_execsql_test 12.1 {
  INSERT INTO tt (rowid, c4, c45) VALUES(1, 'abc', 'abc');
  SELECT mit(matchinfo(tt, 'b')) FROM tt WHERE tt MATCH 'abc';
} [list [list [expr 1<<4] [expr 1<<(45-32)]]]

} ;# foreach_detail_mode

finish_test

set testprefix fts5simple

# If SQLITE_ENABLE_FTS5 is defined, omit this file.
ifcapable !fts5 {
  finish_test
  return
}
 

 if 1 {

#-------------------------------------------------------------------------
#
set doc "x x [string repeat {y } 50]z z"
do_execsql_test 1.0 {
  CREATE VIRTUAL TABLE t1 USING fts5(x);
  INSERT INTO t1(t1, rank) VALUES('pgsz', 32);
  BEGIN;

  INSERT INTO x1 SELECT rnddoc(5) FROM ii;
}

do_execsql_test 4.1 {
  SELECT rowid, x, x1 FROM x1 WHERE x1 MATCH '*reads'
} {0 {} 4}

#-------------------------------------------------------------------------
reset_db
do_execsql_test 15.0 {
  CREATE VIRTUAL TABLE x2 USING fts5(x, prefix=1);
  INSERT INTO x2 VALUES('ab');

}

do_execsql_test 15.1 {
  INSERT INTO x2(x2) VALUES('integrity-check');
}

}

#-------------------------------------------------------------------------
foreach_detail_mode $testprefix {
  reset_db
  fts5_aux_test_functions db
  do_execsql_test 16.0 {
    CREATE VIRTUAL TABLE x3 USING fts5(x, detail=%DETAIL%);
    INSERT INTO x3 VALUES('a b c d e f');
  }
  do_execsql_test 16.1 {
    SELECT fts5_test_poslist(x3) FROM x3('(a NOT b) OR c');
  } {2.0.2}

  do_execsql_test 16.1 {
    SELECT fts5_test_poslist(x3) FROM x3('a OR c');
  } {{0.0.0 1.0.2}}
}

finish_test