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Overview
Comment:Remove unused fields from KeyInfo. Enhancement the EXPLAIN output for KeyInfo P4 columns.
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SHA1: 9eb585660bddd136ce69562cc5d8b6552e773dfc
User & Date: drh 2013-07-26 21:13:39
Context
2013-07-27
18:52
Fixes for sqlite_stat3 related functionality. Also EXPLAIN QUERY PLAN. check-in: 2fbe583868 user: dan tags: trunk
2013-07-26
21:13
Remove unused fields from KeyInfo. Enhancement the EXPLAIN output for KeyInfo P4 columns. check-in: 9eb585660b user: drh tags: trunk
20:04
Update where.c with patches from sqlite3. src4 where.c is now based on sqlite3 artifact 1a26c37b7b. check-in: 3f4a1c7648 user: dan tags: trunk
Changes
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Changes to src/build.c. 

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    pPk = sqlite4FindPrimaryKey(pIdx->pTable, 0);
  }
  nCol = pIdx->nColumn + (pPk ? pPk->nColumn : 0);

  nBytes = sizeof(KeyInfo) + (nCol-1)*sizeof(CollSeq*) + nCol;
  pKey = (KeyInfo *)sqlite4DbMallocZero(db, nBytes);
  if( pKey ){
    pKey->db = pParse->db;
    pKey->aSortOrder = (u8 *)&(pKey->aColl[nCol]);
    assert( &pKey->aSortOrder[nCol]==&(((u8 *)pKey)[nBytes]) );

    for(i=0; i<pIdx->nColumn; i++){
      char *zColl = pIdx->azColl[i];
      assert( zColl );
      pKey->aColl[i] = sqlite4LocateCollSeq(pParse, zColl);








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    pPk = sqlite4FindPrimaryKey(pIdx->pTable, 0);
  }
  nCol = pIdx->nColumn + (pPk ? pPk->nColumn : 0);

  nBytes = sizeof(KeyInfo) + (nCol-1)*sizeof(CollSeq*) + nCol;
  pKey = (KeyInfo *)sqlite4DbMallocZero(db, nBytes);
  if( pKey ){

    pKey->aSortOrder = (u8 *)&(pKey->aColl[nCol]);
    assert( &pKey->aSortOrder[nCol]==&(((u8 *)pKey)[nBytes]) );

    for(i=0; i<pIdx->nColumn; i++){
      char *zColl = pIdx->azColl[i];
      assert( zColl );
      pKey->aColl[i] = sqlite4LocateCollSeq(pParse, zColl);

Changes to src/select.c. 

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  pInfo = (KeyInfo *)sqlite4DbMallocZero(db, nByte);

  if( pInfo ){
    int i;                        /* Used to iterate through pList */

    pInfo->aSortOrder = (u8*)&pInfo->aColl[nField];
    pInfo->nField = (u16)nField;
    pInfo->enc = ENC(db);
    pInfo->db = db;

    for(i=0; i<pList->nExpr; i++){
      CollSeq *pColl;
      pColl = sqlite4ExprCollSeq(pParse, pList->a[i].pExpr);
      if( !pColl ) pColl = db->pDfltColl;
      pInfo->aColl[i] = pColl;
      pInfo->aSortOrder[i] = pList->a[i].sortOrder;
................................................................................
    pKeyInfo = sqlite4DbMallocZero(db,
                       sizeof(*pKeyInfo)+nCol*(sizeof(CollSeq*) + 1));
    if( !pKeyInfo ){
      rc = SQLITE4_NOMEM;
      goto multi_select_end;
    }

    pKeyInfo->enc = ENC(db);
    pKeyInfo->nField = (u16)nCol;

    for(i=0, apColl=pKeyInfo->aColl; i<nCol; i++, apColl++){
      *apColl = multiSelectCollSeq(pParse, p, i);
      if( 0==*apColl ){
        *apColl = db->pDfltColl;
      }
................................................................................
      aPermute[i] = pItem->iOrderByCol - 1;
    }
    pKeyMerge =
      sqlite4DbMallocRaw(db, sizeof(*pKeyMerge)+nOrderBy*(sizeof(CollSeq*)+1));
    if( pKeyMerge ){
      pKeyMerge->aSortOrder = (u8*)&pKeyMerge->aColl[nOrderBy];
      pKeyMerge->nField = (u16)nOrderBy;
      pKeyMerge->enc = ENC(db);
      for(i=0; i<nOrderBy; i++){
        CollSeq *pColl;
        Expr *pTerm = pOrderBy->a[i].pExpr;
        if( pTerm->flags & EP_ExpCollate ){
          pColl = pTerm->pColl;
        }else{
          pColl = multiSelectCollSeq(pParse, p, aPermute[i]);
................................................................................
    pParse->nMem += nExpr + 1;
    sqlite4VdbeAddOp2(v, OP_Integer, 0, regPrev);
    pKeyDup = sqlite4DbMallocZero(db,
                  sizeof(*pKeyDup) + nExpr*(sizeof(CollSeq*)+1) );
    if( pKeyDup ){
      pKeyDup->aSortOrder = (u8*)&pKeyDup->aColl[nExpr];
      pKeyDup->nField = (u16)nExpr;
      pKeyDup->enc = ENC(db);
      for(i=0; i<nExpr; i++){
        pKeyDup->aColl[i] = multiSelectCollSeq(pParse, p, i);
        pKeyDup->aSortOrder[i] = 0;
      }
    }
  }
 








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  pInfo = (KeyInfo *)sqlite4DbMallocZero(db, nByte);

  if( pInfo ){
    int i;                        /* Used to iterate through pList */

    pInfo->aSortOrder = (u8*)&pInfo->aColl[nField];
    pInfo->nField = (u16)nField;



    for(i=0; i<pList->nExpr; i++){
      CollSeq *pColl;
      pColl = sqlite4ExprCollSeq(pParse, pList->a[i].pExpr);
      if( !pColl ) pColl = db->pDfltColl;
      pInfo->aColl[i] = pColl;
      pInfo->aSortOrder[i] = pList->a[i].sortOrder;
................................................................................
    pKeyInfo = sqlite4DbMallocZero(db,
                       sizeof(*pKeyInfo)+nCol*(sizeof(CollSeq*) + 1));
    if( !pKeyInfo ){
      rc = SQLITE4_NOMEM;
      goto multi_select_end;
    }


    pKeyInfo->nField = (u16)nCol;

    for(i=0, apColl=pKeyInfo->aColl; i<nCol; i++, apColl++){
      *apColl = multiSelectCollSeq(pParse, p, i);
      if( 0==*apColl ){
        *apColl = db->pDfltColl;
      }
................................................................................
      aPermute[i] = pItem->iOrderByCol - 1;
    }
    pKeyMerge =
      sqlite4DbMallocRaw(db, sizeof(*pKeyMerge)+nOrderBy*(sizeof(CollSeq*)+1));
    if( pKeyMerge ){
      pKeyMerge->aSortOrder = (u8*)&pKeyMerge->aColl[nOrderBy];
      pKeyMerge->nField = (u16)nOrderBy;

      for(i=0; i<nOrderBy; i++){
        CollSeq *pColl;
        Expr *pTerm = pOrderBy->a[i].pExpr;
        if( pTerm->flags & EP_ExpCollate ){
          pColl = pTerm->pColl;
        }else{
          pColl = multiSelectCollSeq(pParse, p, aPermute[i]);
................................................................................
    pParse->nMem += nExpr + 1;
    sqlite4VdbeAddOp2(v, OP_Integer, 0, regPrev);
    pKeyDup = sqlite4DbMallocZero(db,
                  sizeof(*pKeyDup) + nExpr*(sizeof(CollSeq*)+1) );
    if( pKeyDup ){
      pKeyDup->aSortOrder = (u8*)&pKeyDup->aColl[nExpr];
      pKeyDup->nField = (u16)nExpr;

      for(i=0; i<nExpr; i++){
        pKeyDup->aColl[i] = multiSelectCollSeq(pParse, p, i);
        pKeyDup->aSortOrder[i] = 0;
      }
    }
  }

Changes to src/sqliteInt.h. 

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/*
** An instance of the following structure describes an index key.  It 
** includes information such as sort order and collating sequence for
** each key, and the number of primary key fields appended to the end.
*/
struct KeyInfo {
  sqlite4 *db;        /* The database connection */
  u8 enc;             /* Text encoding - one of the SQLITE4_UTF* values */
  u16 nField;         /* Total number of entries in aColl[] */
  u16 nPK;            /* Number of primary key entries at the end of aColl[] */
  u16 nData;          /* Number of columns of data in KV entry value */
  u8 *aSortOrder;     /* Sort order for each column.  May be NULL */
  CollSeq *aColl[1];  /* Collating sequence for each term of the key */
};









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/*
** An instance of the following structure describes an index key.  It 
** includes information such as sort order and collating sequence for
** each key, and the number of primary key fields appended to the end.
*/
struct KeyInfo {


  u16 nField;         /* Total number of entries in aColl[] */
  u16 nPK;            /* Number of primary key entries at the end of aColl[] */
  u16 nData;          /* Number of columns of data in KV entry value */
  u8 *aSortOrder;     /* Sort order for each column.  May be NULL */
  CollSeq *aColl[1];  /* Collating sequence for each term of the key */
};

Changes to src/vdbe.c. 

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    if( NEVER(p2<2) ) {
      rc = SQLITE4_CORRUPT_BKPT;
      goto abort_due_to_error;
    }
  }
  if( pOp->p4type==P4_KEYINFO ){
    pKeyInfo = pOp->p4.pKeyInfo;
    pKeyInfo->enc = ENC(p->db);
    nField = pKeyInfo->nField+1;
  }else if( pOp->p4type==P4_INT32 ){
    nField = pOp->p4.i;
  }
  assert( pOp->p1>=0 );
  pCur = allocateCursor(p, pOp->p1, nField, iDb, 1);
  if( pCur==0 ) goto no_mem;
................................................................................
  rc = sqlite4KVStoreOpen(db, "ephm", 0, &pCx->pTmpKV,
          SQLITE4_KVOPEN_TEMPORARY | SQLITE4_KVOPEN_NO_TRANSACTIONS
  );
  if( rc==SQLITE4_OK ) rc = sqlite4KVStoreOpenCursor(pCx->pTmpKV, &pCx->pKVCur);
  if( rc==SQLITE4_OK ) rc = sqlite4KVStoreBegin(pCx->pTmpKV, 2);

  pCx->pKeyInfo = pOp->p4.pKeyInfo;
  if( pCx->pKeyInfo ) pCx->pKeyInfo->enc = ENC(p->db);

  break;
}

/* Opcode: OpenSorter P1 P2 * P4 *
**
** This opcode works like OP_OpenEphemeral except that it opens








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    if( NEVER(p2<2) ) {
      rc = SQLITE4_CORRUPT_BKPT;
      goto abort_due_to_error;
    }
  }
  if( pOp->p4type==P4_KEYINFO ){
    pKeyInfo = pOp->p4.pKeyInfo;

    nField = pKeyInfo->nField+1;
  }else if( pOp->p4type==P4_INT32 ){
    nField = pOp->p4.i;
  }
  assert( pOp->p1>=0 );
  pCur = allocateCursor(p, pOp->p1, nField, iDb, 1);
  if( pCur==0 ) goto no_mem;
................................................................................
  rc = sqlite4KVStoreOpen(db, "ephm", 0, &pCx->pTmpKV,
          SQLITE4_KVOPEN_TEMPORARY | SQLITE4_KVOPEN_NO_TRANSACTIONS
  );
  if( rc==SQLITE4_OK ) rc = sqlite4KVStoreOpenCursor(pCx->pTmpKV, &pCx->pKVCur);
  if( rc==SQLITE4_OK ) rc = sqlite4KVStoreBegin(pCx->pTmpKV, 2);

  pCx->pKeyInfo = pOp->p4.pKeyInfo;


  break;
}

/* Opcode: OpenSorter P1 P2 * P4 *
**
** This opcode works like OP_OpenEphemeral except that it opens

Changes to src/vdbeaux.c. 

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  char *zP4 = zTemp;
  assert( nTemp>=30 );
  switch( pOp->p4type ){
    case P4_KEYINFO_STATIC:
    case P4_KEYINFO: {
      int i, j;
      KeyInfo *pKeyInfo = pOp->p4.pKeyInfo;
      i = sqlite4_snprintf(zTemp, nTemp, "keyinfo(%d", pKeyInfo->nField);


      for(j=0; j<pKeyInfo->nField; j++){
        CollSeq *pColl = pKeyInfo->aColl[j];
        if( pColl ){
          int n = sqlite4Strlen30(pColl->zName);
          if( i+n>nTemp-6 ){
            memcpy(&zTemp[i],",...",4);
            break;
................................................................................

#if defined(VDBE_PROFILE) || defined(SQLITE4_DEBUG)
/*
** Print a single opcode.  This routine is used for debugging only.
*/
void sqlite4VdbePrintOp(FILE *pOut, int pc, Op *pOp){
  char *zP4;
  char zPtr[50];
  static const char *zFormat1 = "%4d %-13s %4d %4d %4d %-4s %.2X %s\n";
  if( pOut==0 ) pOut = stdout;
  zP4 = displayP4(pOp, zPtr, sizeof(zPtr));
  fprintf(pOut, zFormat1, pc, 
      sqlite4OpcodeName(pOp->opcode), pOp->p1, pOp->p2, pOp->p3, zP4, pOp->p5,
#ifdef SQLITE4_DEBUG
      pOp->zComment ? pOp->zComment : ""








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  char *zP4 = zTemp;
  assert( nTemp>=30 );
  switch( pOp->p4type ){
    case P4_KEYINFO_STATIC:
    case P4_KEYINFO: {
      int i, j;
      KeyInfo *pKeyInfo = pOp->p4.pKeyInfo;
      i = sqlite4_snprintf(zTemp, nTemp,
                 "keyinfo(%d,%d,%d", pKeyInfo->nField, pKeyInfo->nPK,
                 pKeyInfo->nData);
      for(j=0; j<pKeyInfo->nField; j++){
        CollSeq *pColl = pKeyInfo->aColl[j];
        if( pColl ){
          int n = sqlite4Strlen30(pColl->zName);
          if( i+n>nTemp-6 ){
            memcpy(&zTemp[i],",...",4);
            break;
................................................................................

#if defined(VDBE_PROFILE) || defined(SQLITE4_DEBUG)
/*
** Print a single opcode.  This routine is used for debugging only.
*/
void sqlite4VdbePrintOp(FILE *pOut, int pc, Op *pOp){
  char *zP4;
  char zPtr[150];
  static const char *zFormat1 = "%4d %-13s %4d %4d %4d %-4s %.2X %s\n";
  if( pOut==0 ) pOut = stdout;
  zP4 = displayP4(pOp, zPtr, sizeof(zPtr));
  fprintf(pOut, zFormat1, pc, 
      sqlite4OpcodeName(pOp->opcode), pOp->p1, pOp->p2, pOp->p3, zP4, pOp->p5,
#ifdef SQLITE4_DEBUG
      pOp->zComment ? pOp->zComment : ""

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