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SQLite training in Houston TX on 2019-11-05 (details)
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Overview
Comment:Update the ANALYZE logic so that it works with WITHOUT ROWID tables.
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | omit-rowid
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SHA1: 9075770e4030b35677fbbe291f3c3c4946937a9a
User & Date: drh 2013-11-02 18:46:04
Context
2013-11-02
19:34
Change the "idx" name of the primary key index for WITHOUT ROWID tables in sqlite_statN statistics tables to be the name of the table rather than the fabricated index name (ex: sqlite_autoindex_xyz_1). This makes it consistent with sqlite_master table. check-in: 4ee4d310 user: drh tags: omit-rowid
18:46
Update the ANALYZE logic so that it works with WITHOUT ROWID tables. check-in: 9075770e user: drh tags: omit-rowid
14:37
Store the root page of the PRIMARY KEY index for a WITHOUT ROWID table in the sqlite_master entry for the main table and omit the sqlite_master entry for the PRIMARY KEY. check-in: b7544bb2 user: drh tags: omit-rowid
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to src/analyze.c.

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typedef struct Stat4Sample Stat4Sample;
struct Stat4Sample {
  tRowcnt *anEq;                  /* sqlite_stat4.nEq */
  tRowcnt *anDLt;                 /* sqlite_stat4.nDLt */
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
  tRowcnt *anLt;                  /* sqlite_stat4.nLt */
  i64 iRowid;                     /* Rowid in main table of the key */


  u8 isPSample;                   /* True if a periodic sample */
  int iCol;                       /* If !isPSample, the reason for inclusion */
  u32 iHash;                      /* Tiebreaker hash */
#endif
};                                                    
struct Stat4Accum {
  tRowcnt nRow;             /* Number of rows in the entire table */
  tRowcnt nPSample;         /* How often to do a periodic sample */
  int nCol;                 /* Number of columns in index + rowid */
  int mxSample;             /* Maximum number of samples to accumulate */
  Stat4Sample current;      /* Current row as a Stat4Sample */
  u32 iPrn;                 /* Pseudo-random number used for sampling */
  Stat4Sample *aBest;       /* Array of (nCol-1) best samples */
  int iMin;                 /* Index in a[] of entry with minimum score */
  int nSample;              /* Current number of samples */
  int iGet;                 /* Index of current sample accessed by stat_get() */
  Stat4Sample *a;           /* Array of mxSample Stat4Sample objects */

};






































/*
** Implementation of the stat_init(N,C) SQL function. The two parameters
** are the number of rows in the table or index (C) and the number of columns
** in the index (N).  The second argument (C) is only used for STAT3 and STAT4.
**
** This routine allocates the Stat4Accum object in heap memory. The return 
................................................................................
  int argc,
  sqlite3_value **argv
){
  Stat4Accum *p;
  int nCol;                       /* Number of columns in index being sampled */
  int nColUp;                     /* nCol rounded up for alignment */
  int n;                          /* Bytes of space to allocate */

#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
  int mxSample = SQLITE_STAT4_SAMPLES;
#endif

  /* Decode the three function arguments */
  UNUSED_PARAMETER(argc);
  nCol = sqlite3_value_int(argv[0]);
................................................................................

  /* Allocate the space required for the Stat4Accum object */
  n = sizeof(*p) 
    + sizeof(tRowcnt)*nColUp                  /* Stat4Accum.anEq */
    + sizeof(tRowcnt)*nColUp                  /* Stat4Accum.anDLt */
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
    + sizeof(tRowcnt)*nColUp                  /* Stat4Accum.anLt */
    + sizeof(Stat4Sample)*(nCol+mxSample)   /* Stat4Accum.aBest[], a[] */
    + sizeof(tRowcnt)*3*nColUp*(nCol+mxSample)
#endif
  ;

  p = sqlite3MallocZero(n);
  if( p==0 ){
    sqlite3_result_error_nomem(context);
    return;
  }


  p->nRow = 0;
  p->nCol = nCol;
  p->current.anDLt = (tRowcnt*)&p[1];
  p->current.anEq = &p->current.anDLt[nColUp];

#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
  {
................................................................................
    for(i=0; i<nCol; i++){
      p->aBest[i].iCol = i;
    }
  }
#endif

  /* Return a pointer to the allocated object to the caller */
  sqlite3_result_blob(context, p, sizeof(p), sqlite3_free);
}
static const FuncDef statInitFuncdef = {
  1+IsStat34,      /* nArg */
  SQLITE_UTF8,     /* funcFlags */
  0,               /* pUserData */
  0,               /* pNext */
  statInit,        /* xFunc */
................................................................................
** Copy the contents of object (*pFrom) into (*pTo).
*/
static void sampleCopy(Stat4Accum *p, Stat4Sample *pTo, Stat4Sample *pFrom){
  pTo->iRowid = pFrom->iRowid;
  pTo->isPSample = pFrom->isPSample;
  pTo->iCol = pFrom->iCol;
  pTo->iHash = pFrom->iHash;




  memcpy(pTo->anEq, pFrom->anEq, sizeof(tRowcnt)*p->nCol);
  memcpy(pTo->anLt, pFrom->anLt, sizeof(tRowcnt)*p->nCol);
  memcpy(pTo->anDLt, pFrom->anDLt, sizeof(tRowcnt)*p->nCol);
}

/*
** Copy the contents of sample *pNew into the p->a[] array. If necessary,
................................................................................
#ifndef SQLITE_ENABLE_STAT3_OR_STAT4
  UNUSED_PARAMETER( p );
  UNUSED_PARAMETER( iChng );
#endif
}

/*
** Implementation of the stat_push SQL function:  stat_push(P,R,C)
** Arguments:
**
**    P     Pointer to the Stat4Accum object created by stat_init()
**    C     Index of left-most column to differ from previous row
**    R     Rowid for the current row

**
** The SQL function always returns NULL.
**
** The R parameter is only used for STAT3 and STAT4.
*/
static void statPush(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  int i;
................................................................................
      p->current.anLt[i] += p->current.anEq[i];
#endif
      p->current.anEq[i] = 1;
    }
  }
  p->nRow++;
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4

  p->current.iRowid = sqlite3_value_int64(argv[2]);







  p->current.iHash = p->iPrn = p->iPrn*1103515245 + 12345;
#endif

#ifdef SQLITE_ENABLE_STAT4
  {
    tRowcnt nLt = p->current.anLt[p->nCol-1];

................................................................................
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
  else if( eCall==STAT_GET_ROWID ){
    if( p->iGet<0 ){
      samplePushPrevious(p, 0);
      p->iGet = 0;
    }
    if( p->iGet<p->nSample ){


      sqlite3_result_int64(context, p->a[p->iGet].iRowid);



    }
  }else{
    tRowcnt *aCnt = 0;

    assert( p->iGet<p->nSample );
    switch( eCall ){
      case STAT_GET_NEQ:  aCnt = p->a[p->iGet].anEq; break;
................................................................................
    **   regRowid = idx(rowid)            // STAT34 only
    **   stat_push(P, regChng, regRowid)  // 3rd parameter STAT34 only
    **   Next csr
    **   if !eof(csr) goto next_row;
    */
    sqlite3VdbeJumpHere(v, aGotoChng[nCol]);
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
    sqlite3VdbeAddOp2(v, OP_IdxRowid, iIdxCur, regRowid);
    assert( regRowid==(regStat4+2) );














#endif
    assert( regChng==(regStat4+1) );
    sqlite3VdbeAddOp3(v, OP_Function, 1, regStat4, regTemp);
    sqlite3VdbeChangeP4(v, -1, (char*)&statPushFuncdef, P4_FUNCDEF);
    sqlite3VdbeChangeP5(v, 2+IsStat34);
    sqlite3VdbeAddOp2(v, OP_Next, iIdxCur, addrNextRow);

................................................................................
      int regLt = regStat1+1;
      int regDLt = regStat1+2;
      int regSample = regStat1+3;
      int regCol = regStat1+4;
      int regSampleRowid = regCol + nCol;
      int addrNext;
      int addrIsNull;


      pParse->nMem = MAX(pParse->nMem, regCol+nCol+1);

      addrNext = sqlite3VdbeCurrentAddr(v);
      callStatGet(v, regStat4, STAT_GET_ROWID, regSampleRowid);
      addrIsNull = sqlite3VdbeAddOp1(v, OP_IsNull, regSampleRowid);
      callStatGet(v, regStat4, STAT_GET_NEQ, regEq);
      callStatGet(v, regStat4, STAT_GET_NLT, regLt);
      callStatGet(v, regStat4, STAT_GET_NDLT, regDLt);
      sqlite3VdbeAddOp3(v, OP_NotExists, iTabCur, addrNext, regSampleRowid);
#ifdef SQLITE_ENABLE_STAT3
      sqlite3ExprCodeGetColumnOfTable(v, pTab, iTabCur, 
                                      pIdx->aiColumn[0], regSample);
#else
      for(i=0; i<nCol; i++){
        i16 iCol = pIdx->aiColumn[i];
        sqlite3ExprCodeGetColumnOfTable(v, pTab, iTabCur, iCol, regCol+i);







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typedef struct Stat4Sample Stat4Sample;
struct Stat4Sample {
  tRowcnt *anEq;                  /* sqlite_stat4.nEq */
  tRowcnt *anDLt;                 /* sqlite_stat4.nDLt */
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
  tRowcnt *anLt;                  /* sqlite_stat4.nLt */
  i64 iRowid;                     /* Rowid in main table of the key */
  u32 nRowid;                     /* Sizeof aRowid[] */
  u8 *aRowid;                     /* Key for WITHOUT ROWID tables */
  u8 isPSample;                   /* True if a periodic sample */
  int iCol;                       /* If !isPSample, the reason for inclusion */
  u32 iHash;                      /* Tiebreaker hash */
#endif
};                                                    
struct Stat4Accum {
  tRowcnt nRow;             /* Number of rows in the entire table */
  tRowcnt nPSample;         /* How often to do a periodic sample */
  int nCol;                 /* Number of columns in index + rowid */
  int mxSample;             /* Maximum number of samples to accumulate */
  Stat4Sample current;      /* Current row as a Stat4Sample */
  u32 iPrn;                 /* Pseudo-random number used for sampling */
  Stat4Sample *aBest;       /* Array of nCol best samples */
  int iMin;                 /* Index in a[] of entry with minimum score */
  int nSample;              /* Current number of samples */
  int iGet;                 /* Index of current sample accessed by stat_get() */
  Stat4Sample *a;           /* Array of mxSample Stat4Sample objects */
  sqlite3 *db;              /* Database connection, for malloc() */
};

/* Reclaim memory used by a Stat4Sample
*/
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
static void sampleClear(sqlite3 *db, Stat4Sample *p){
  sqlite3DbFree(db, p->aRowid);
  p->aRowid = 0;
  p->nRowid = 0;
}
#endif

/* Make a copy of the Stat4Sample.aRowid field.
*/
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
static void sampleDup(sqlite3 *db, Stat4Sample *p){
  if( p->aRowid ){
    u8 *aCopy = sqlite3DbMallocRaw(db, p->nRowid);
    if( aCopy ){
      memcpy(aCopy, p->aRowid, p->nRowid);
      p->aRowid = aCopy;
    }
  }
}
#endif

/*
** Reclaim all memory of a Stat4Accum structure.
*/
static void stat4Destructor(void *pOld){
  Stat4Accum *p = (Stat4Accum*)pOld;
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
  int i;
  for(i=0; i<p->nCol; i++) sampleClear(p->db, p->aBest+i);
  for(i=0; i<p->mxSample; i++) sampleClear(p->db, p->a+i);
#endif
  sqlite3DbFree(p->db, p);
}

/*
** Implementation of the stat_init(N,C) SQL function. The two parameters
** are the number of rows in the table or index (C) and the number of columns
** in the index (N).  The second argument (C) is only used for STAT3 and STAT4.
**
** This routine allocates the Stat4Accum object in heap memory. The return 
................................................................................
  int argc,
  sqlite3_value **argv
){
  Stat4Accum *p;
  int nCol;                       /* Number of columns in index being sampled */
  int nColUp;                     /* nCol rounded up for alignment */
  int n;                          /* Bytes of space to allocate */
  sqlite3 *db;                    /* Database connection */
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
  int mxSample = SQLITE_STAT4_SAMPLES;
#endif

  /* Decode the three function arguments */
  UNUSED_PARAMETER(argc);
  nCol = sqlite3_value_int(argv[0]);
................................................................................

  /* Allocate the space required for the Stat4Accum object */
  n = sizeof(*p) 
    + sizeof(tRowcnt)*nColUp                  /* Stat4Accum.anEq */
    + sizeof(tRowcnt)*nColUp                  /* Stat4Accum.anDLt */
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
    + sizeof(tRowcnt)*nColUp                  /* Stat4Accum.anLt */
    + sizeof(Stat4Sample)*(nCol+mxSample)     /* Stat4Accum.aBest[], a[] */
    + sizeof(tRowcnt)*3*nColUp*(nCol+mxSample)
#endif
  ;
  db = sqlite3_context_db_handle(context);
  p = sqlite3DbMallocZero(db, n);
  if( p==0 ){
    sqlite3_result_error_nomem(context);
    return;
  }

  p->db = db;
  p->nRow = 0;
  p->nCol = nCol;
  p->current.anDLt = (tRowcnt*)&p[1];
  p->current.anEq = &p->current.anDLt[nColUp];

#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
  {
................................................................................
    for(i=0; i<nCol; i++){
      p->aBest[i].iCol = i;
    }
  }
#endif

  /* Return a pointer to the allocated object to the caller */
  sqlite3_result_blob(context, p, sizeof(p), stat4Destructor);
}
static const FuncDef statInitFuncdef = {
  1+IsStat34,      /* nArg */
  SQLITE_UTF8,     /* funcFlags */
  0,               /* pUserData */
  0,               /* pNext */
  statInit,        /* xFunc */
................................................................................
** Copy the contents of object (*pFrom) into (*pTo).
*/
static void sampleCopy(Stat4Accum *p, Stat4Sample *pTo, Stat4Sample *pFrom){
  pTo->iRowid = pFrom->iRowid;
  pTo->isPSample = pFrom->isPSample;
  pTo->iCol = pFrom->iCol;
  pTo->iHash = pFrom->iHash;
  sampleClear(p->db, pTo);
  pTo->nRowid = pFrom->nRowid;
  pTo->aRowid = pFrom->aRowid;
  sampleDup(p->db, pTo);
  memcpy(pTo->anEq, pFrom->anEq, sizeof(tRowcnt)*p->nCol);
  memcpy(pTo->anLt, pFrom->anLt, sizeof(tRowcnt)*p->nCol);
  memcpy(pTo->anDLt, pFrom->anDLt, sizeof(tRowcnt)*p->nCol);
}

/*
** Copy the contents of sample *pNew into the p->a[] array. If necessary,
................................................................................
#ifndef SQLITE_ENABLE_STAT3_OR_STAT4
  UNUSED_PARAMETER( p );
  UNUSED_PARAMETER( iChng );
#endif
}

/*
** Implementation of the stat_push SQL function:  stat_push(P,C,R)
** Arguments:
**
**    P     Pointer to the Stat4Accum object created by stat_init()
**    C     Index of left-most column to differ from previous row
**    R     Rowid for the current row.  Might be a key record for
**          WITHOUT ROWID tables.
**
** The SQL function always returns NULL.
**
** The R parameter is only used for STAT3 and STAT4
*/
static void statPush(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  int i;
................................................................................
      p->current.anLt[i] += p->current.anEq[i];
#endif
      p->current.anEq[i] = 1;
    }
  }
  p->nRow++;
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
  if( sqlite3_value_type(argv[2])==SQLITE_INTEGER ){
    p->current.iRowid = sqlite3_value_int64(argv[2]);
    p->current.aRowid = 0;
    p->current.nRowid = 0;
  }else{
    p->current.iRowid = 0;
    p->current.nRowid = sqlite3_value_bytes(argv[2]);
    p->current.aRowid = (u8*)sqlite3_value_blob(argv[2]);
  }
  p->current.iHash = p->iPrn = p->iPrn*1103515245 + 12345;
#endif

#ifdef SQLITE_ENABLE_STAT4
  {
    tRowcnt nLt = p->current.anLt[p->nCol-1];

................................................................................
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4
  else if( eCall==STAT_GET_ROWID ){
    if( p->iGet<0 ){
      samplePushPrevious(p, 0);
      p->iGet = 0;
    }
    if( p->iGet<p->nSample ){
      Stat4Sample *pS = p->a + p->iGet;
      if( pS->nRowid==0 ){
        sqlite3_result_int64(context, pS->iRowid);
      }else{
        sqlite3_result_blob(context, pS->aRowid, pS->nRowid, SQLITE_STATIC);
      }
    }
  }else{
    tRowcnt *aCnt = 0;

    assert( p->iGet<p->nSample );
    switch( eCall ){
      case STAT_GET_NEQ:  aCnt = p->a[p->iGet].anEq; break;
................................................................................
    **   regRowid = idx(rowid)            // STAT34 only
    **   stat_push(P, regChng, regRowid)  // 3rd parameter STAT34 only
    **   Next csr
    **   if !eof(csr) goto next_row;
    */
    sqlite3VdbeJumpHere(v, aGotoChng[nCol]);
#ifdef SQLITE_ENABLE_STAT3_OR_STAT4

    assert( regRowid==(regStat4+2) );
    if( HasRowid(pTab) ){
      sqlite3VdbeAddOp2(v, OP_IdxRowid, iIdxCur, regRowid);
    }else{
      Index *pPk = sqlite3PrimaryKeyIndex(pIdx->pTable);
      int j, k, regKey;
      regKey = sqlite3GetTempRange(pParse, pPk->nKeyCol);
      for(j=0; j<pPk->nKeyCol; j++){
        k = sqlite3ColumnOfIndex(pIdx, pPk->aiColumn[j]);
        sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, k, regKey+j);
        VdbeComment((v, "%s", pTab->aCol[pPk->aiColumn[j]].zName));
      }
      sqlite3VdbeAddOp3(v, OP_MakeRecord, regKey, pPk->nKeyCol, regRowid);
      sqlite3ReleaseTempRange(pParse, regKey, pPk->nKeyCol);
    }
#endif
    assert( regChng==(regStat4+1) );
    sqlite3VdbeAddOp3(v, OP_Function, 1, regStat4, regTemp);
    sqlite3VdbeChangeP4(v, -1, (char*)&statPushFuncdef, P4_FUNCDEF);
    sqlite3VdbeChangeP5(v, 2+IsStat34);
    sqlite3VdbeAddOp2(v, OP_Next, iIdxCur, addrNextRow);

................................................................................
      int regLt = regStat1+1;
      int regDLt = regStat1+2;
      int regSample = regStat1+3;
      int regCol = regStat1+4;
      int regSampleRowid = regCol + nCol;
      int addrNext;
      int addrIsNull;
      u8 seekOp = HasRowid(pTab) ? OP_NotExists : OP_NotFound;

      pParse->nMem = MAX(pParse->nMem, regCol+nCol+1);

      addrNext = sqlite3VdbeCurrentAddr(v);
      callStatGet(v, regStat4, STAT_GET_ROWID, regSampleRowid);
      addrIsNull = sqlite3VdbeAddOp1(v, OP_IsNull, regSampleRowid);
      callStatGet(v, regStat4, STAT_GET_NEQ, regEq);
      callStatGet(v, regStat4, STAT_GET_NLT, regLt);
      callStatGet(v, regStat4, STAT_GET_NDLT, regDLt);
      sqlite3VdbeAddOp4Int(v, seekOp, iTabCur, addrNext, regSampleRowid, 0);
#ifdef SQLITE_ENABLE_STAT3
      sqlite3ExprCodeGetColumnOfTable(v, pTab, iTabCur, 
                                      pIdx->aiColumn[0], regSample);
#else
      for(i=0; i<nCol; i++){
        i16 iCol = pIdx->aiColumn[i];
        sqlite3ExprCodeGetColumnOfTable(v, pTab, iTabCur, iCol, regCol+i);

Changes to test/without_rowid1.test.

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do_execsql_test without_rowid1-1.40 {
  VACUUM;
  SELECT *, '|' FROM t1 ORDER BY b, d;
} {1250 phone flipper harvard | journal sherman ammonia 3.1415926 | journal sherman gamma 3.1415926 | arctic sleep ammonia helena |}
integrity_check without_rowid1-1.41







finish_test







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do_execsql_test without_rowid1-1.40 {
  VACUUM;
  SELECT *, '|' FROM t1 ORDER BY b, d;
} {1250 phone flipper harvard | journal sherman ammonia 3.1415926 | journal sherman gamma 3.1415926 | arctic sleep ammonia helena |}
integrity_check without_rowid1-1.41

do_execsql_test without_rowid1-1.50 {
  ANALYZE;
  SELECT * FROM sqlite_stat1 ORDER BY idx;
} {t1 sqlite_autoindex_t1_1 {4 2 1} t1 t1bd {4 2 2}}


finish_test