/* If a column from a table in pSrcList is referenced, then record
  ** this fact in the pSrcList.a[].colUsed bitmask.  Column 0 causes
  ** bit 0 to be set.  Column 1 sets bit 1.  And so forth.  If the
  ** column number is greater than the number of bits in the bitmask
  ** then set the high-order bit of the bitmask.
  */
  if( pExpr->iColumn>=0 && pMatch!=0 ){
    int n = pExpr->iColumn;
    testcase( n==BMS-1 );
    if( n>=BMS ){
      n = BMS-1;
    }
    assert( pMatch->iCursor==pExpr->iTable );
    pMatch->colUsed |= ((Bitmask)1)<<n;
  }

  /* Clean up and return
................................................................................
  if( p ){
    SrcListItem *pItem = &pSrc->a[iSrc];
    p->pTab = pItem->pTab;
    p->iTable = pItem->iCursor;
    p->iColumn = (ynVar)iCol;
    testcase( iCol==BMS );
    testcase( iCol==BMS-1 );
    pItem->colUsed |= ((Bitmask)1)<<(iCol>=BMS ? BMS-1 : iCol);
    ExprSetProperty(p, EP_Resolved);
  }
  return p;
}

static void resolveMatchArg(Parse *pParse, NameContext *pNC, Expr *pExpr){
  SrcList *pSrc = pNC->pSrcList;

  /* If a column from a table in pSrcList is referenced, then record
  ** this fact in the pSrcList.a[].colUsed bitmask.  Column 0 causes
  ** bit 0 to be set.  Column 1 sets bit 1.  And so forth.  If the
  ** column number is greater than the number of bits in the bitmask
  ** then set the high-order bit of the bitmask.
  */
  if( pMatch!=0 ){
    int n = pExpr->iColumn;
    testcase( n==BMS-1 );
    if( n>=BMS || n<0 ){
      n = BMS-1;
    }
    assert( pMatch->iCursor==pExpr->iTable );
    pMatch->colUsed |= ((Bitmask)1)<<n;
  }

  /* Clean up and return
................................................................................
  if( p ){
    SrcListItem *pItem = &pSrc->a[iSrc];
    p->pTab = pItem->pTab;
    p->iTable = pItem->iCursor;
    p->iColumn = (ynVar)iCol;
    testcase( iCol==BMS );
    testcase( iCol==BMS-1 );
    pItem->colUsed |= ((Bitmask)1)<<((iCol>=BMS || iCol<0) ? BMS-1 : iCol);
    ExprSetProperty(p, EP_Resolved);
  }
  return p;
}

static void resolveMatchArg(Parse *pParse, NameContext *pNC, Expr *pExpr){
  SrcList *pSrc = pNC->pSrcList;

**
** The jointype starts out showing the join type between the current table
** and the next table on the list.  The parser builds the list this way.
** But sqlite4SrcListShiftJoinType() later shifts the jointypes so that each
** jointype expresses the join between the table and the previous table.
**
** In the colUsed field, the high-order bit (bit 63) is set if the table
** contains more than 63 columns and the 64-th or later column is used.

*/
struct SrcList {
  i16 nSrc;        /* Number of tables or subqueries in the FROM clause */
  i16 nAlloc;      /* Number of entries allocated in a[] below */
  SrcListItem a[1]; /* One entry for each identifier on the list */
};

**
** The jointype starts out showing the join type between the current table
** and the next table on the list.  The parser builds the list this way.
** But sqlite4SrcListShiftJoinType() later shifts the jointypes so that each
** jointype expresses the join between the table and the previous table.
**
** In the colUsed field, the high-order bit (bit 63) is set if the table
** contains more than 63 columns and the 64-th or later column is used, or
** if the table uses an implicit primary key and it is accessed.
*/
struct SrcList {
  i16 nSrc;        /* Number of tables or subqueries in the FROM clause */
  i16 nAlloc;      /* Number of entries allocated in a[] below */
  SrcListItem a[1]; /* One entry for each identifier on the list */
};

    p->apCsr[iCur] = 0;
  }
  if( SQLITE4_OK==sqlite4VdbeMemGrow(pMem, nByte, 0) ){
    p->apCsr[iCur] = pCx = (VdbeCursor*)pMem->z;
    memset(pCx, 0, sizeof(VdbeCursor));
    pCx->iDb = iDb;
    pCx->nField = nField;

  }
  return pCx;
}

/*
** Try to convert a value into a numeric representation if we can
** do so without loss of information.  In other words, if the string
................................................................................
**
** This opcode seeks cursor P1 so that it points to the PK index entry
** that corresponds to the same table row as the current entry that 
** cursor P3 points to. The entry must exist. If it does not, this opcode
** throws an SQLITE4_CORRUPT exception.
*/
case OP_SeekPk: {


  VdbeCursor *pPk;                /* Cursor P1 */
  VdbeCursor *pIdx;               /* Cursor P3 */
  KVByteArray const *aKey;        /* Key data from cursor pIdx */
  KVSize nKey;                    /* Size of aKey[] in bytes */
  int nShort;                     /* Size of aKey[] without PK fields */
  KVByteArray *aPkKey;
  KVSize nPkKey;

  pPk = p->apCsr[pOp->p1];
  pIdx = p->apCsr[pOp->p3];

  if( pIdx->pFts ){
    rc = sqlite4Fts5Pk(pIdx->pFts, pPk->iRoot, &aPkKey, &nPkKey);
    if( rc==SQLITE4_OK ){
      rc = sqlite4KVCursorSeek(pPk->pKVCur, aPkKey, nPkKey, 0);
      if( rc==SQLITE4_NOTFOUND ) rc = SQLITE4_CORRUPT_BKPT;
      pPk->nullRow = 0;
    }
  }else{
    pPk->pIdxCsr = pIdx;














  }

  break;
}

/* Opcode: SeekGe P1 P2 P3 P4 *
**
................................................................................
  KVSize nProbe;                  /* Size of aProbe[] in bytes */
  int dir;                        /* KV search dir (+ve or -ve) */
  const KVByteArray *aKey;        /* Pointer to final cursor key */
  KVSize nKey;                    /* Size of aKey[] in bytes */

  pC = p->apCsr[pOp->p1];
  pC->nullRow = 0;


  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  assert( pOp->p2!=0 );
  assert( pC!=0 );
  assert( pC->pseudoTableReg==0 );
  assert( OP_SeekLe == OP_SeekLt+1 );
  assert( OP_SeekGe == OP_SeekLt+2 );
................................................................................
  sqlite4_found_count++;
#endif

  alreadyExists = 0;
  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  assert( pOp->p4type==P4_INT32 );
  pC = p->apCsr[pOp->p1];

  assert( pC!=0 );
  pIn3 = &aMem[pOp->p3];
  assert( pC->pKVCur!=0 );
  assert( pC->isTable==0 || pOp->opcode==OP_NotExists );
  if( pOp->p4.i>0 ){
    rc = sqlite4VdbeEncodeKey(
        db, pIn3, pOp->p4.i, pOp->p4.i + (pOp->p5 & OPFLAG_PARTIALKEY),
................................................................................
** P1 must not be pseudo-table. It has to be a real table.
*/
case OP_Delete: {
  VdbeCursor *pC;
  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  pC = p->apCsr[pOp->p1];
  assert( pC!=0 );
  assert( pC->pIdxCsr==0 );
  rc = sqlite4KVCursorDelete(pC->pKVCur);
  if( pOp->p2 & OPFLAG_NCHANGE ) p->nChange++;
  break;
}

/* Opcode: ResetCount * * * * *
**
................................................................................
  KVSize nKey;
  int n;

  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  pC = p->apCsr[pOp->p1];
  rc = sqlite4VdbeCursorMoveto(db, pC);
  if( rc!=SQLITE4_OK ) break;
  assert( pC->pIdxCsr==0 );
  assert( pC->pseudoTableReg==0 );
  if( pC->nullRow ){
    pOut->flags = MEM_Null;
    break;
#ifndef SQLITE4_OMIT_VIRTUALTABLE
  }else if( pC->pVtabCursor ){
    pVtab = pC->pVtabCursor->pVtab;
................................................................................
  }else if( rc==SQLITE4_NOTFOUND ){
    rc = SQLITE4_OK;
  }

  break;
}

/* Opcode: IdxRowid P1 P2 * * *
**
** Write into register P2 an integer which is the last entry in the record at
** the end of the index key pointed to by cursor P1.  This integer should be
** the rowid of the table entry to which this index entry points.

**
** See also: Rowid, MakeRecord.
*/
case OP_IdxRowid: {              /* out2-prerelease */
  assert( 0 );





































  break;
}

/* Opcode: IdxGE P1 P2 P3
**
** P1 is an open cursor. P3 contains a database key formatted by MakeKey.
** This opcode compares the current key that index P1 points to with

    p->apCsr[iCur] = 0;
  }
  if( SQLITE4_OK==sqlite4VdbeMemGrow(pMem, nByte, 0) ){
    p->apCsr[iCur] = pCx = (VdbeCursor*)pMem->z;
    memset(pCx, 0, sizeof(VdbeCursor));
    pCx->iDb = iDb;
    pCx->nField = nField;
    sqlite4_buffer_init(&pCx->key, p->db->pEnv->pMM);
  }
  return pCx;
}

/*
** Try to convert a value into a numeric representation if we can
** do so without loss of information.  In other words, if the string
................................................................................
**
** This opcode seeks cursor P1 so that it points to the PK index entry
** that corresponds to the same table row as the current entry that 
** cursor P3 points to. The entry must exist. If it does not, this opcode
** throws an SQLITE4_CORRUPT exception.
*/
case OP_SeekPk: {
  KVByteArray *aKey;              /* Key data from cursor pIdx */
  KVSize nKey;                    /* Size of aKey[] in bytes */
  VdbeCursor *pPk;                /* Cursor P1 */
  VdbeCursor *pIdx;               /* Cursor P3 */


  int nShort;                     /* Size of aKey[] without PK fields */
  int nVarint;                    /* Size of varint pPk->iRoot */


  pPk = p->apCsr[pOp->p1];
  pIdx = p->apCsr[pOp->p3];

  if( pIdx->pFts ){
    rc = sqlite4Fts5Pk(pIdx->pFts, pPk->iRoot, &aKey, &nKey);
    if( rc==SQLITE4_OK ){
      rc = sqlite4KVCursorSeek(pPk->pKVCur, aKey, nKey, 0);
      if( rc==SQLITE4_NOTFOUND ) rc = SQLITE4_CORRUPT_BKPT;
      pPk->nullRow = 0;
    }
  }else{
    rc = sqlite4KVCursorKey(pIdx->pKVCur, (const KVByteArray **)&aKey, &nKey);
    if( rc!=SQLITE4_OK ) break;
    nShort = sqlite4VdbeShortKey(aKey, nKey, 
        pIdx->pKeyInfo->nField - pIdx->pKeyInfo->nPK, 0
    );
    nVarint = sqlite4VarintLen(pPk->iRoot);
    rc = sqlite4_buffer_resize(&pPk->key, nVarint + nKey - nShort);
    if( rc!=SQLITE4_OK ) break;
    putVarint32((u8 *)(pPk->key.p), pPk->iRoot);
    memcpy(((u8*)pPk->key.p) + nVarint, &aKey[nShort], nKey-nShort);
    assert( pPk->key.n>0 );

#if 0
    rc = sqlite4VdbeCursorMoveto(db, pPk);
#endif
  }

  break;
}

/* Opcode: SeekGe P1 P2 P3 P4 *
**
................................................................................
  KVSize nProbe;                  /* Size of aProbe[] in bytes */
  int dir;                        /* KV search dir (+ve or -ve) */
  const KVByteArray *aKey;        /* Pointer to final cursor key */
  KVSize nKey;                    /* Size of aKey[] in bytes */

  pC = p->apCsr[pOp->p1];
  pC->nullRow = 0;
  pC->key.n = 0;

  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  assert( pOp->p2!=0 );
  assert( pC!=0 );
  assert( pC->pseudoTableReg==0 );
  assert( OP_SeekLe == OP_SeekLt+1 );
  assert( OP_SeekGe == OP_SeekLt+2 );
................................................................................
  sqlite4_found_count++;
#endif

  alreadyExists = 0;
  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  assert( pOp->p4type==P4_INT32 );
  pC = p->apCsr[pOp->p1];
  pC->key.n = 0;
  assert( pC!=0 );
  pIn3 = &aMem[pOp->p3];
  assert( pC->pKVCur!=0 );
  assert( pC->isTable==0 || pOp->opcode==OP_NotExists );
  if( pOp->p4.i>0 ){
    rc = sqlite4VdbeEncodeKey(
        db, pIn3, pOp->p4.i, pOp->p4.i + (pOp->p5 & OPFLAG_PARTIALKEY),
................................................................................
** P1 must not be pseudo-table. It has to be a real table.
*/
case OP_Delete: {
  VdbeCursor *pC;
  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  pC = p->apCsr[pOp->p1];
  assert( pC!=0 );
  assert( pC->key.n==0 );
  rc = sqlite4KVCursorDelete(pC->pKVCur);
  if( pOp->p2 & OPFLAG_NCHANGE ) p->nChange++;
  break;
}

/* Opcode: ResetCount * * * * *
**
................................................................................
  KVSize nKey;
  int n;

  assert( pOp->p1>=0 && pOp->p1<p->nCursor );
  pC = p->apCsr[pOp->p1];
  rc = sqlite4VdbeCursorMoveto(db, pC);
  if( rc!=SQLITE4_OK ) break;
  assert( pC->key.n==0 );
  assert( pC->pseudoTableReg==0 );
  if( pC->nullRow ){
    pOut->flags = MEM_Null;
    break;
#ifndef SQLITE4_OMIT_VIRTUALTABLE
  }else if( pC->pVtabCursor ){
    pVtab = pC->pVtabCursor->pVtab;
................................................................................
  }else if( rc==SQLITE4_NOTFOUND ){
    rc = SQLITE4_OK;
  }

  break;
}

/* Opcode: IdxRowkey P1 P2 P3 * *
**
** Cursor P1 points to an index entry. Extract the encoded primary key 
** fields from the entry. Then set output register P2 to a blob value
** containing the value P3 as a varint followed by the encoded PK
** fields.
**
** See also: Rowkey
*/
case OP_IdxRowkey: {              /* out2-prerelease */

  KVByteArray const *aKey;        /* Key data from cursor pIdx */
  KVSize nKey;                    /* Size of aKey[] in bytes */
  int nShort;                     /* Size of aKey[] without PK fields */
  KVByteArray *aPkKey;            /* Pointer to PK buffer */
  KVSize nPkKey;                  /* Size of aPkKey in bytes */
  int iRoot;
  VdbeCursor *pC;

  iRoot = pOp->p3;
  pOut = &aMem[pOp->p2];
  memAboutToChange(p, pOut);

  pC = p->apCsr[pOp->p1];

  rc = sqlite4KVCursorKey(pC->pKVCur, &aKey, &nKey);
  if( rc!=SQLITE4_OK ) break;

  nShort = sqlite4VdbeShortKey(aKey, nKey, 
      pC->pKeyInfo->nField - pC->pKeyInfo->nPK, 0
  );

  nPkKey = sqlite4VarintLen(iRoot) + nKey - nShort;
  if( nPkKey>db->aLimit[SQLITE4_LIMIT_LENGTH] ){
    goto too_big;
  }

  rc = sqlite4VdbeMemGrow(pOut, nPkKey, 0);
  if( rc!=SQLITE4_OK ) break;
  aPkKey = pOut->z;
  putVarint32(aPkKey, iRoot);
  memcpy(&aPkKey[nPkKey - (nKey-nShort)], &aKey[nShort], nKey-nShort);
  pOut->type = SQLITE4_BLOB;
  pOut->n = nPkKey;
  MemSetTypeFlag(pOut, MEM_Blob);

  pOut->enc = SQLITE4_UTF8;  /* In case the blob is ever cast to text */
  UPDATE_MAX_BLOBSIZE(pOut);
  break;
}

/* Opcode: IdxGE P1 P2 P3
**
** P1 is an open cursor. P3 contains a database key formatted by MakeKey.
** This opcode compares the current key that index P1 points to with

  Bool isOrdered;       /* True if the underlying table is BTREE_UNORDERED */
  sqlite4_vtab_cursor *pVtabCursor;  /* The cursor for a virtual table */
  const sqlite4_module *pModule;     /* Module for cursor pVtabCursor */
  i64 seqCount;         /* Sequence counter */
  i64 movetoTarget;     /* Argument to the deferred move-to */
  VdbeSorter *pSorter;  /* Sorter object for OP_SorterOpen cursors */
  Fts5Cursor *pFts;     /* Fts5 cursor object (or NULL) */
  VdbeCursor *pIdxCsr;  /* Index cursor for deferred seek (OP_SeekPk) */


  /* Result of last sqlite4-Moveto() done by an OP_NotExists or 
  ** OP_IsUnique opcode on this cursor. */
  int seekResult;
};

/*

  Bool isOrdered;       /* True if the underlying table is BTREE_UNORDERED */
  sqlite4_vtab_cursor *pVtabCursor;  /* The cursor for a virtual table */
  const sqlite4_module *pModule;     /* Module for cursor pVtabCursor */
  i64 seqCount;         /* Sequence counter */
  i64 movetoTarget;     /* Argument to the deferred move-to */
  VdbeSorter *pSorter;  /* Sorter object for OP_SorterOpen cursors */
  Fts5Cursor *pFts;     /* Fts5 cursor object (or NULL) */

  sqlite4_buffer key;

  /* Result of last sqlite4-Moveto() done by an OP_NotExists or 
  ** OP_IsUnique opcode on this cursor. */
  int seekResult;
};

/*

  sqlite4Fts5Close(pCx->pFts);
  if( pCx->pKVCur ){
    sqlite4KVCursorClose(pCx->pKVCur);
  }
  if( pCx->pTmpKV ){
    sqlite4KVStoreClose(pCx->pTmpKV);
  }

#ifndef SQLITE4_OMIT_VIRTUALTABLE
  if( pCx->pVtabCursor ){
    sqlite4_vtab_cursor *pVtabCursor = pCx->pVtabCursor;
    const sqlite4_module *pModule = pCx->pModule;
    p->inVtabMethod = 1;
    pModule->xClose(pVtabCursor);
    p->inVtabMethod = 0;
................................................................................
**
** If the operation is a success, SQLITE4_OK is returned. Or, if the
** required entry is not found in the PK index, SQLITE4_CORRUPT. Or if 
** some other error occurs, an error code is returned.
*/
int sqlite4VdbeCursorMoveto(sqlite4 *db, VdbeCursor *pPk){
  int rc = SQLITE4_OK;            /* Return code */
  VdbeCursor *pIdx;               /* Index cursor to base seek on */
  if( (pIdx = pPk->pIdxCsr) ){
    KVByteArray const *aKey;      /* Key data from cursor pIdx */
    KVSize nKey;                  /* Size of aKey[] in bytes */

    assert( pIdx->pKeyInfo->nPK>0 );
    assert( pPk->pKeyInfo->nPK==0 );

    rc = sqlite4KVCursorKey(pIdx->pKVCur, &aKey, &nKey);
    if( rc==SQLITE4_OK ){
      int nShort;                 /* Size of aKey[] without PK fields */
      KVByteArray *aPkKey;        /* Pointer to PK buffer */
      KVSize nPkKey;              /* Size of aPkKey in bytes */

      nShort = sqlite4VdbeShortKey(aKey, nKey, 
          pIdx->pKeyInfo->nField - pIdx->pKeyInfo->nPK, 0
      );
      nPkKey = sqlite4VarintLen(pPk->iRoot) + nKey - nShort;
      aPkKey = sqlite4DbMallocRaw(db, nPkKey);

      if( aPkKey ){
        putVarint32(aPkKey, pPk->iRoot);
        memcpy(&aPkKey[nPkKey - (nKey-nShort)], &aKey[nShort], nKey-nShort);
        rc = sqlite4KVCursorSeek(pPk->pKVCur, aPkKey, nPkKey, 0);
        if( rc==SQLITE4_NOTFOUND ){
          rc = SQLITE4_CORRUPT_BKPT;
        }
        pPk->nullRow = 0;
        sqlite4DbFree(db, aPkKey);

      }
      pPk->pIdxCsr = 0;
    }
  }

  return rc;
}

  sqlite4Fts5Close(pCx->pFts);
  if( pCx->pKVCur ){
    sqlite4KVCursorClose(pCx->pKVCur);
  }
  if( pCx->pTmpKV ){
    sqlite4KVStoreClose(pCx->pTmpKV);
  }
  sqlite4_buffer_clear(&pCx->key);
#ifndef SQLITE4_OMIT_VIRTUALTABLE
  if( pCx->pVtabCursor ){
    sqlite4_vtab_cursor *pVtabCursor = pCx->pVtabCursor;
    const sqlite4_module *pModule = pCx->pModule;
    p->inVtabMethod = 1;
    pModule->xClose(pVtabCursor);
    p->inVtabMethod = 0;
................................................................................
**
** If the operation is a success, SQLITE4_OK is returned. Or, if the
** required entry is not found in the PK index, SQLITE4_CORRUPT. Or if 
** some other error occurs, an error code is returned.
*/
int sqlite4VdbeCursorMoveto(sqlite4 *db, VdbeCursor *pPk){
  int rc = SQLITE4_OK;            /* Return code */
  if( pPk->key.n!=0 ){





    assert( pPk->pKeyInfo->nPK==0 );
















    rc = sqlite4KVCursorSeek(pPk->pKVCur, pPk->key.p, pPk->key.n, 0);
    if( rc==SQLITE4_NOTFOUND ){
      rc = SQLITE4_CORRUPT_BKPT;
    }
    pPk->nullRow = 0;

    pPk->key.n = 0;
  }




  return rc;
}

    }

    /* Seek the PK cursor, if required */
    disableTerm(pLevel, pRangeStart);
    disableTerm(pLevel, pRangeEnd);
    if( pIdx->eIndexType!=SQLITE4_INDEX_PRIMARYKEY
     && pIdx->eIndexType!=SQLITE4_INDEX_TEMP

    ){
      sqlite4VdbeAddOp3(v, OP_SeekPk, iCur, 0, iIdxCur);
    }

    /* If there are inequality constraints, check that the value
    ** of the table column that the inequality contrains is not NULL.
    ** If it is, jump to the next iteration of the loop.
................................................................................

/*
** Return a bitmask where 1s indicate that the corresponding column of
** the table is used by an index.  Only the first 63 columns are considered.
*/
static Bitmask columnsInIndex(Index *pIdx){
  Bitmask m = 0;

  int j;
  for(j=pIdx->nColumn-1; j>=0; j--){
    int x = pIdx->aiColumn[j];
    testcase( x==BMS-1 );
    testcase( x==BMS-2 );
    if( x<BMS-1 ) m |= MASKBIT(x);

  }
  return m;
}


/*
** Add all WhereLoop objects for a single table of the join where the table
................................................................................
    pNew->wsFlags = 0;
    pNew->rRun = whereCostAdd(rSize,rLogSize) + 16;
    rc = whereLoopInsert(pBuilder, pNew);
  }

  /* Loop through the set of indices being considered. */
  for(; rc==SQLITE4_OK && pProbe; pProbe=pProbe->pNext, iSortIdx++){

    if( pProbe->eIndexType==SQLITE4_INDEX_FTS5 ) continue;
    assert( pProbe->tnum>0 );

    pNew->u.btree.nEq = 0;
    pNew->nLTerm = 0;
    pNew->rSetup = 0;
    pNew->prereq = mExtra;
    pNew->nOut = rSize;
    pNew->u.btree.pIndex = pProbe;
    pNew->wsFlags = WHERE_INDEXED;

    b = indexMightHelpWithOrderBy(pBuilder, pProbe, pSrc->iCursor);
    /* The ONEPASS_DESIRED flags never occurs together with ORDER BY */
    assert( (pWInfo->wctrlFlags & WHERE_ONEPASS_DESIRED)==0 || b==0 );
    pNew->iSortIdx = b ? iSortIdx : 0;

    if( pProbe==pPk || b ){
      /* Add a WhereLoop for full-scan via primary key index. */








      /* TUNING: Cost of full table scan is 3*(N + log2(N)).
      **  +  The extra 3 factor is to encourage the use of indexed lookups
      **     over full scans.  A smaller constant 2 is used for covering
      **     index scans so that a covering index scan will be favored over
      **     a table scan. */
      /* TODO: Fix tuning for src4 as described in comment immediately above. */
      pNew->rRun = whereCostAdd(rSize,rLogSize) + 16;
















      rc = whereLoopInsert(pBuilder, pNew);
      if( rc ) break;
    }

    rc = whereLoopAddBtreeIndex(pBuilder, pSrc, pProbe, 0);

    /* If there was an INDEXED BY or NOT INDEXED clause, then only one
................................................................................
    ** reference the index.
    */
    if( pLoop->wsFlags & (WHERE_INDEXED|WHERE_IDX_ONLY) ){
      pIdx = pLoop->u.btree.pIndex;
    }else if( pLoop->wsFlags & WHERE_MULTI_OR ){
      pIdx = pLevel->u.pCovidx;
    }

    if( pIdx && !db->mallocFailed ){

      int *aiCover = pIdx->aiCover;
      int nCover = pIdx->nCover;
      int k, j, last;
      VdbeOp *pOp;

      pOp = sqlite4VdbeGetOp(v, pWInfo->iTop);
      last = sqlite4VdbeCurrentAddr(v);
................................................................................
            if( pOp->p2==aiCover[j] ){
              pOp->p2 = j;
              pOp->p1 = pLevel->iIdxCur;
              break;
            }
          }
          assert( (pLoop->wsFlags & WHERE_IDX_ONLY)==0 || j<nCover );





        }
      }
    }
  }

  /* Final cleanup
  */
  pParse->nQueryLoop = pWInfo->savedNQueryLoop;
  whereInfoFree(db, pWInfo);
  return;
}

    }

    /* Seek the PK cursor, if required */
    disableTerm(pLevel, pRangeStart);
    disableTerm(pLevel, pRangeEnd);
    if( pIdx->eIndexType!=SQLITE4_INDEX_PRIMARYKEY
     && pIdx->eIndexType!=SQLITE4_INDEX_TEMP
     && 0==(pLoop->wsFlags & WHERE_IDX_ONLY)
    ){
      sqlite4VdbeAddOp3(v, OP_SeekPk, iCur, 0, iIdxCur);
    }

    /* If there are inequality constraints, check that the value
    ** of the table column that the inequality contrains is not NULL.
    ** If it is, jump to the next iteration of the loop.
................................................................................

/*
** Return a bitmask where 1s indicate that the corresponding column of
** the table is used by an index.  Only the first 63 columns are considered.
*/
static Bitmask columnsInIndex(Index *pIdx){
  Bitmask m = 0;
  if( pIdx->eIndexType!=SQLITE4_INDEX_PRIMARYKEY ){
    int j;
    for(j=pIdx->nCover-1; j>=0; j--){
      int x = pIdx->aiCover[j];
      testcase( x==BMS-1 );
      testcase( x==BMS-2 );
      if( x<BMS-1 ) m |= MASKBIT(x);
    }
  }
  return m;
}


/*
** Add all WhereLoop objects for a single table of the join where the table
................................................................................
    pNew->wsFlags = 0;
    pNew->rRun = whereCostAdd(rSize,rLogSize) + 16;
    rc = whereLoopInsert(pBuilder, pNew);
  }

  /* Loop through the set of indices being considered. */
  for(; rc==SQLITE4_OK && pProbe; pProbe=pProbe->pNext, iSortIdx++){
    int bCover = (pProbe!=pPk && 0==(pSrc->colUsed & ~columnsInIndex(pProbe)));
    if( pProbe->eIndexType==SQLITE4_INDEX_FTS5 ) continue;
    assert( pProbe->tnum>0 );

    pNew->u.btree.nEq = 0;
    pNew->nLTerm = 0;
    pNew->rSetup = 0;
    pNew->prereq = mExtra;
    pNew->nOut = rSize;
    pNew->u.btree.pIndex = pProbe;
    pNew->wsFlags = bCover ? (WHERE_IDX_ONLY|WHERE_INDEXED) : WHERE_INDEXED;

    b = indexMightHelpWithOrderBy(pBuilder, pProbe, pSrc->iCursor);
    /* The ONEPASS_DESIRED flags never occurs together with ORDER BY */
    assert( (pWInfo->wctrlFlags & WHERE_ONEPASS_DESIRED)==0 || b==0 );
    pNew->iSortIdx = b ? iSortIdx : 0;

    if( pProbe==pPk || b || (bCover
     && pProbe->bUnordered==0

     && (pWInfo->wctrlFlags & WHERE_ONEPASS_DESIRED)==0
#if 0
     && sqlite3GlobalConfig.bUseCis
     && OptimizationEnabled(pWInfo->pParse->db, SQLITE_CoverIdxScan)
#endif
    )){
      if( pProbe==pPk ){
        /* TUNING: Cost of full table scan is 3*(N + log2(N)).
        **  +  The extra 3 factor is to encourage the use of indexed lookups
        **     over full scans.  A smaller constant 2 is used for covering
        **     index scans so that a covering index scan will be favored over
        **     a table scan. */

        pNew->rRun = whereCostAdd(rSize,rLogSize) + 16;
      }else if( bCover ){
        /* TUNING: Cost of a covering index scan is 2*(N + log2(N)).
        **  +  The extra 2 factor is to encourage the use of indexed lookups
        **     over index scans.  A table scan uses a factor of 3 so that
        **     index scans are favored over table scans.
        **  +  If this covering index might also help satisfy the ORDER BY
        **     clause, then the cost is fudged down slightly so that this
        **     index is favored above other indices that have no hope of
        **     helping with the ORDER BY. */
        pNew->rRun = 10 + whereCostAdd(rSize,rLogSize) - b;
      }else{
        assert( b!=0 ); 
        /* TUNING: Cost of scanning a non-covering index is (N+1)*log2(N)
         ** which we will simplify to just N*log2(N) */
        pNew->rRun = rSize + rLogSize;
      }
      rc = whereLoopInsert(pBuilder, pNew);
      if( rc ) break;
    }

    rc = whereLoopAddBtreeIndex(pBuilder, pSrc, pProbe, 0);

    /* If there was an INDEXED BY or NOT INDEXED clause, then only one
................................................................................
    ** reference the index.
    */
    if( pLoop->wsFlags & (WHERE_INDEXED|WHERE_IDX_ONLY) ){
      pIdx = pLoop->u.btree.pIndex;
    }else if( pLoop->wsFlags & WHERE_MULTI_OR ){
      pIdx = pLevel->u.pCovidx;
    }
    if( pIdx && pIdx->eIndexType!=SQLITE4_INDEX_PRIMARYKEY 
     && !db->mallocFailed 
    ){
      int *aiCover = pIdx->aiCover;
      int nCover = pIdx->nCover;
      int k, j, last;
      VdbeOp *pOp;

      pOp = sqlite4VdbeGetOp(v, pWInfo->iTop);
      last = sqlite4VdbeCurrentAddr(v);
................................................................................
            if( pOp->p2==aiCover[j] ){
              pOp->p2 = j;
              pOp->p1 = pLevel->iIdxCur;
              break;
            }
          }
          assert( (pLoop->wsFlags & WHERE_IDX_ONLY)==0 || j<nCover );
        }else if( pOp->opcode==OP_RowKey ){
          Index *pPk = sqlite4FindPrimaryKey(pTab, 0);
          pOp->p3 = pPk->tnum;
          pOp->p1 = pLevel->iIdxCur;
          pOp->opcode = OP_IdxRowkey;
        }
      }
    }
  }

  /* Final cleanup
  */
  pParse->nQueryLoop = pWInfo->savedNQueryLoop;
  whereInfoFree(db, pWInfo);
  return;
}

  cksort {SELECT b FROM collate4t1 ORDER BY b}
} {{} A B a b nosort}
do_test collate4-1.1.5 {
  cksort {SELECT b FROM collate4t1 ORDER BY b COLLATE TEXT}
} {{} A B a b nosort}
do_test collate4-1.1.6 {
  cksort {SELECT b FROM collate4t1 ORDER BY b COLLATE NOCASE}
} {{} A a B b sort}

do_test collate4-1.1.7 {
  execsql {
    CREATE TABLE collate4t2(
      a PRIMARY KEY COLLATE NOCASE, 
      b UNIQUE COLLATE TEXT
    );
................................................................................
    INSERT INTO collate4t4 VALUES( 'A', 'A' );
    CREATE INDEX collate4i3 ON collate4t4(a COLLATE TEXT);
    CREATE INDEX collate4i4 ON collate4t4(b COLLATE NOCASE);
  }
} {}
do_test collate4-1.1.22 {
  cksort {SELECT a FROM collate4t4 ORDER BY a}
} {{} A a B b sort}
do_test collate4-1.1.23 {
  cksort {SELECT a FROM collate4t4 ORDER BY a COLLATE NOCASE}
} {{} A a B b sort}
do_test collate4-1.1.24 {
  cksort {SELECT a FROM collate4t4 ORDER BY a COLLATE TEXT}
} {{} A B a b nosort}
do_test collate4-1.1.25 {
  cksort {SELECT b FROM collate4t4 ORDER BY b}
} {{} A B a b sort}
do_test collate4-1.1.26 {
................................................................................
  cksort {SELECT a FROM collate4t1 ORDER BY a COLLATE text}
} {{} A B a b sort}
do_test collate4-1.2.4 {
  cksort {SELECT a FROM collate4t1 ORDER BY a, b}
} {{} A a B b nosort}
do_test collate4-1.2.5 {
  cksort {SELECT a FROM collate4t1 ORDER BY a, b COLLATE nocase}
} {{} A a B b sort}
do_test collate4-1.2.6 {
  cksort {SELECT a FROM collate4t1 ORDER BY a, b COLLATE text}
} {{} A a B b nosort}

do_test collate4-1.2.7 {
  execsql {
    CREATE TABLE collate4t2(
................................................................................
    INSERT INTO collate4t3 VALUES( 'B', 'B' );
    INSERT INTO collate4t3 VALUES( 'A', 'A' );
    CREATE INDEX collate4i2 ON collate4t3(a COLLATE TEXT, b COLLATE NOCASE);
  }
} {}
do_test collate4-1.2.15 {
  cksort {SELECT a FROM collate4t3 ORDER BY a}
} {{} A a B b sort}
do_test collate4-1.2.16 {
  cksort {SELECT a FROM collate4t3 ORDER BY a COLLATE nocase}
} {{} A a B b sort}
do_test collate4-1.2.17 {
  cksort {SELECT a FROM collate4t3 ORDER BY a COLLATE text}
} {{} A B a b nosort}
do_test collate4-1.2.18 {
  cksort {SELECT a FROM collate4t3 ORDER BY a COLLATE text, b}
} {{} A B a b sort}
do_test collate4-1.2.19 {
................................................................................
  execsql {
    DROP INDEX collate4i1;
    CREATE INDEX collate4i1 ON collate4t1(a COLLATE NUMERIC);
  }
  count {
    SELECT min(a) FROM collate4t1;
  }
} {10 9}
do_test collate4-4.6 {
  count {
    SELECT max(a) FROM collate4t1;
  }
} {20 9}
do_test collate4-4.7 {
  execsql {
    DROP TABLE collate4t1;
  }
} {}

# Also test the scalar min() and max() functions.

  cksort {SELECT b FROM collate4t1 ORDER BY b}
} {{} A B a b nosort}
do_test collate4-1.1.5 {
  cksort {SELECT b FROM collate4t1 ORDER BY b COLLATE TEXT}
} {{} A B a b nosort}
do_test collate4-1.1.6 {
  cksort {SELECT b FROM collate4t1 ORDER BY b COLLATE NOCASE}
} {{} a A b B sort}

do_test collate4-1.1.7 {
  execsql {
    CREATE TABLE collate4t2(
      a PRIMARY KEY COLLATE NOCASE, 
      b UNIQUE COLLATE TEXT
    );
................................................................................
    INSERT INTO collate4t4 VALUES( 'A', 'A' );
    CREATE INDEX collate4i3 ON collate4t4(a COLLATE TEXT);
    CREATE INDEX collate4i4 ON collate4t4(b COLLATE NOCASE);
  }
} {}
do_test collate4-1.1.22 {
  cksort {SELECT a FROM collate4t4 ORDER BY a}
} {{} a A b B sort}
do_test collate4-1.1.23 {
  cksort {SELECT a FROM collate4t4 ORDER BY a COLLATE NOCASE}
} {{} a A b B sort}
do_test collate4-1.1.24 {
  cksort {SELECT a FROM collate4t4 ORDER BY a COLLATE TEXT}
} {{} A B a b nosort}
do_test collate4-1.1.25 {
  cksort {SELECT b FROM collate4t4 ORDER BY b}
} {{} A B a b sort}
do_test collate4-1.1.26 {
................................................................................
  cksort {SELECT a FROM collate4t1 ORDER BY a COLLATE text}
} {{} A B a b sort}
do_test collate4-1.2.4 {
  cksort {SELECT a FROM collate4t1 ORDER BY a, b}
} {{} A a B b nosort}
do_test collate4-1.2.5 {
  cksort {SELECT a FROM collate4t1 ORDER BY a, b COLLATE nocase}
} {{} a A b B sort}
do_test collate4-1.2.6 {
  cksort {SELECT a FROM collate4t1 ORDER BY a, b COLLATE text}
} {{} A a B b nosort}

do_test collate4-1.2.7 {
  execsql {
    CREATE TABLE collate4t2(
................................................................................
    INSERT INTO collate4t3 VALUES( 'B', 'B' );
    INSERT INTO collate4t3 VALUES( 'A', 'A' );
    CREATE INDEX collate4i2 ON collate4t3(a COLLATE TEXT, b COLLATE NOCASE);
  }
} {}
do_test collate4-1.2.15 {
  cksort {SELECT a FROM collate4t3 ORDER BY a}
} {{} a A b B sort}
do_test collate4-1.2.16 {
  cksort {SELECT a FROM collate4t3 ORDER BY a COLLATE nocase}
} {{} a A b B sort}
do_test collate4-1.2.17 {
  cksort {SELECT a FROM collate4t3 ORDER BY a COLLATE text}
} {{} A B a b nosort}
do_test collate4-1.2.18 {
  cksort {SELECT a FROM collate4t3 ORDER BY a COLLATE text, b}
} {{} A B a b sort}
do_test collate4-1.2.19 {
................................................................................
  execsql {
    DROP INDEX collate4i1;
    CREATE INDEX collate4i1 ON collate4t1(a COLLATE NUMERIC);
  }
  count {
    SELECT min(a) FROM collate4t1;
  }
} {10 5}
do_test collate4-4.6 {
  count {
    SELECT max(a) FROM collate4t1;
  }
} {20 5}
do_test collate4-4.7 {
  execsql {
    DROP TABLE collate4t1;
  }
} {}

# Also test the scalar min() and max() functions.

# using an index rather than by sorting.
#
do_test where-6.1 {
  execsql {
    CREATE TABLE t3(a,b,c);
    CREATE INDEX t3a ON t3(a);
    CREATE INDEX t3bc ON t3(b,c);
    CREATE INDEX t3acb ON t3(a,c,b);
    INSERT INTO t3 SELECT w, 101-w, y FROM t1;
    SELECT count(*), sum(a), sum(b), sum(c) FROM t3;
  }
} {100 5050 5050 348550}
do_test where-6.2 {
  cksort {
    SELECT * FROM t3 ORDER BY a LIMIT 3

# using an index rather than by sorting.
#
do_test where-6.1 {
  execsql {
    CREATE TABLE t3(a,b,c);
    CREATE INDEX t3a ON t3(a);
    CREATE INDEX t3bc ON t3(b,c);
    CREATE INDEX t3acb ON t3(a,c,b) COVERING(a,b,c);
    INSERT INTO t3 SELECT w, 101-w, y FROM t1;
    SELECT count(*), sum(a), sum(b), sum(c) FROM t3;
  }
} {100 5050 5050 348550}
do_test where-6.2 {
  cksort {
    SELECT * FROM t3 ORDER BY a LIMIT 3