[kdenetwork/kopete] added cmake support

git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdenetwork@1233119 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 0 insertions, 1210 deletions

diff --git a/kopete/plugins/statistics/sqlite/where.c b/kopete/plugins/statistics/sqlite/where.c
deleted file mode 100644
index 08c174e9..00000000
--- a/kopete/plugins/statistics/sqlite/where.c
+++ /dev/null
@@ -1,1210 +0,0 @@
-/*
-** 2001 September 15
-**
-** 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 module contains C code that generates VDBE code used to process
-** the WHERE clause of SQL statements.
-**
-** $Id$
-*/
-#include "sqliteInt.h"
-
-/*
-** The query generator uses an array of instances of this structure to
-** help it analyze the subexpressions of the WHERE clause.  Each WHERE
-** clause subexpression is separated from the others by an AND operator.
-*/
-typedef struct ExprInfo ExprInfo;
-struct ExprInfo {
-  Expr *p;                /* Pointer to the subexpression */
-  u8 indexable;           /* True if this subexprssion is usable by an index */
-  short int idxLeft;      /* p->pLeft is a column in this table number. -1 if
-                          ** p->pLeft is not the column of any table */
-  short int idxRight;     /* p->pRight is a column in this table number. -1 if
-                          ** p->pRight is not the column of any table */
-  unsigned prereqLeft;    /* Bitmask of tables referenced by p->pLeft */
-  unsigned prereqRight;   /* Bitmask of tables referenced by p->pRight */
-  unsigned prereqAll;     /* Bitmask of tables referenced by p */
-};
-
-/*
-** An instance of the following structure keeps track of a mapping
-** between VDBE cursor numbers and bitmasks.  The VDBE cursor numbers
-** are small integers contained in SrcList_item.iCursor and Expr.iTable
-** fields.  For any given WHERE clause, we want to track which cursors
-** are being used, so we assign a single bit in a 32-bit word to track
-** that cursor.  Then a 32-bit integer is able to show the set of all
-** cursors being used.
-*/
-typedef struct ExprMaskSet ExprMaskSet;
-struct ExprMaskSet {
-  int n;          /* Number of assigned cursor values */
-  int ix[31];     /* Cursor assigned to each bit */
-};
-
-/*
-** Determine the number of elements in an array.
-*/
-#define ARRAYSIZE(X)  (sizeof(X)/sizeof(X[0]))
-
-/*
-** This routine is used to divide the WHERE expression into subexpressions
-** separated by the AND operator.
-**
-** aSlot[] is an array of subexpressions structures.
-** There are nSlot spaces left in this array.  This routine attempts to
-** split pExpr into subexpressions and fills aSlot[] with those subexpressions.
-** The return value is the number of slots filled.
-*/
-static int exprSplit(int nSlot, ExprInfo *aSlot, Expr *pExpr){
-  int cnt = 0;
-  if( pExpr==0 || nSlot<1 ) return 0;
-  if( nSlot==1 || pExpr->op!=TK_AND ){
-    aSlot[0].p = pExpr;
-    return 1;
-  }
-  if( pExpr->pLeft->op!=TK_AND ){
-    aSlot[0].p = pExpr->pLeft;
-    cnt = 1 + exprSplit(nSlot-1, &aSlot[1], pExpr->pRight);
-  }else{
-    cnt = exprSplit(nSlot, aSlot, pExpr->pLeft);
-    cnt += exprSplit(nSlot-cnt, &aSlot[cnt], pExpr->pRight);
-  }
-  return cnt;
-}
-
-/*
-** Initialize an expression mask set
-*/
-#define initMaskSet(P)  memset(P, 0, sizeof(*P))
-
-/*
-** Return the bitmask for the given cursor.  Assign a new bitmask
-** if this is the first time the cursor has been seen.
-*/
-static int getMask(ExprMaskSet *pMaskSet, int iCursor){
-  int i;
-  for(i=0; i<pMaskSet->n; i++){
-    if( pMaskSet->ix[i]==iCursor ) return 1<<i;
-  }
-  if( i==pMaskSet->n && i<ARRAYSIZE(pMaskSet->ix) ){
-    pMaskSet->n++;
-    pMaskSet->ix[i] = iCursor;
-    return 1<<i;
-  }
-  return 0;
-}
-
-/*
-** Destroy an expression mask set
-*/
-#define freeMaskSet(P)   /* NO-OP */
-
-/*
-** This routine walks (recursively) an expression tree and generates
-** a bitmask indicating which tables are used in that expression
-** tree.
-**
-** In order for this routine to work, the calling function must have
-** previously invoked sqlite3ExprResolveIds() on the expression.  See
-** the header comment on that routine for additional information.
-** The sqlite3ExprResolveIds() routines looks for column names and
-** sets their opcodes to TK_COLUMN and their Expr.iTable fields to
-** the VDBE cursor number of the table.
-*/
-static int exprTableUsage(ExprMaskSet *pMaskSet, Expr *p){
-  unsigned int mask = 0;
-  if( p==0 ) return 0;
-  if( p->op==TK_COLUMN ){
-    mask = getMask(pMaskSet, p->iTable);
-    if( mask==0 ) mask = -1;
-    return mask;
-  }
-  if( p->pRight ){
-    mask = exprTableUsage(pMaskSet, p->pRight);
-  }
-  if( p->pLeft ){
-    mask |= exprTableUsage(pMaskSet, p->pLeft);
-  }
-  if( p->pList ){
-    int i;
-    for(i=0; i<p->pList->nExpr; i++){
-      mask |= exprTableUsage(pMaskSet, p->pList->a[i].pExpr);
-    }
-  }
-  return mask;
-}
-
-/*
-** Return TRUE if the given operator is one of the operators that is
-** allowed for an indexable WHERE clause.  The allowed operators are
-** "=", "<", ">", "<=", ">=", and "IN".
-*/
-static int allowedOp(int op){
-  assert( TK_GT==TK_LE-1 && TK_LE==TK_LT-1 && TK_LT==TK_GE-1 && TK_EQ==TK_GT-1);
-  return op==TK_IN || (op>=TK_EQ && op<=TK_GE);
-}
-
-/*
-** Swap two integers.
-*/
-#define SWAP(TYPE,A,B) {TYPE t=A; A=B; B=t;}
-
-/*
-** Return the index in the SrcList that uses cursor iCur.  If iCur is
-** used by the first entry in SrcList return 0.  If iCur is used by
-** the second entry return 1.  And so forth.
-**
-** SrcList is the set of tables in the FROM clause in the order that
-** they will be processed.  The value returned here gives us an index
-** of which tables will be processed first.
-*/
-static int tableOrder(SrcList *pList, int iCur){
-  int i;
-  for(i=0; i<pList->nSrc; i++){
-    if( pList->a[i].iCursor==iCur ) return i;
-  }
-  return -1;
-}
-
-/*
-** The input to this routine is an ExprInfo structure with only the
-** "p" field filled in.  The job of this routine is to analyze the
-** subexpression and populate all the other fields of the ExprInfo
-** structure.
-*/
-static void exprAnalyze(SrcList *pSrc, ExprMaskSet *pMaskSet, ExprInfo *pInfo){
-  Expr *pExpr = pInfo->p;
-  pInfo->prereqLeft = exprTableUsage(pMaskSet, pExpr->pLeft);
-  pInfo->prereqRight = exprTableUsage(pMaskSet, pExpr->pRight);
-  pInfo->prereqAll = exprTableUsage(pMaskSet, pExpr);
-  pInfo->indexable = 0;
-  pInfo->idxLeft = -1;
-  pInfo->idxRight = -1;
-  if( allowedOp(pExpr->op) && (pInfo->prereqRight & pInfo->prereqLeft)==0 ){
-    if( pExpr->pRight && pExpr->pRight->op==TK_COLUMN ){
-      pInfo->idxRight = pExpr->pRight->iTable;
-      pInfo->indexable = 1;
-    }
-    if( pExpr->pLeft->op==TK_COLUMN ){
-      pInfo->idxLeft = pExpr->pLeft->iTable;
-      pInfo->indexable = 1;
-    }
-  }
-  if( pInfo->indexable ){
-    assert( pInfo->idxLeft!=pInfo->idxRight );
-
-    /* We want the expression to be of the form "X = expr", not "expr = X".
-    ** So flip it over if necessary.  If the expression is "X = Y", then
-    ** we want Y to come from an earlier table than X.
-    **
-    ** The collating sequence rule is to always choose the left expression.
-    ** So if we do a flip, we also have to move the collating sequence.
-    */
-    if( tableOrder(pSrc,pInfo->idxLeft)<tableOrder(pSrc,pInfo->idxRight) ){
-      assert( pExpr->op!=TK_IN );
-      SWAP(CollSeq*,pExpr->pRight->pColl,pExpr->pLeft->pColl);
-      SWAP(Expr*,pExpr->pRight,pExpr->pLeft);
-      if( pExpr->op>=TK_GT ){
-        assert( TK_LT==TK_GT+2 );
-        assert( TK_GE==TK_LE+2 );
-        assert( TK_GT>TK_EQ );
-        assert( TK_GT<TK_LE );
-        assert( pExpr->op>=TK_GT && pExpr->op<=TK_GE );
-        pExpr->op = ((pExpr->op-TK_GT)^2)+TK_GT;
-      }
-      SWAP(unsigned, pInfo->prereqLeft, pInfo->prereqRight);
-      SWAP(short int, pInfo->idxLeft, pInfo->idxRight);
-    }
-  }      
-
-}
-
-/*
-** pOrderBy is an ORDER BY clause from a SELECT statement.  pTab is the
-** left-most table in the FROM clause of that same SELECT statement and
-** the table has a cursor number of "base".
-**
-** This routine attempts to find an index for pTab that generates the
-** correct record sequence for the given ORDER BY clause.  The return value
-** is a pointer to an index that does the job.  NULL is returned if the
-** table has no index that will generate the correct sort order.
-**
-** If there are two or more indices that generate the correct sort order
-** and pPreferredIdx is one of those indices, then return pPreferredIdx.
-**
-** nEqCol is the number of columns of pPreferredIdx that are used as
-** equality constraints.  Any index returned must have exactly this same
-** set of columns.  The ORDER BY clause only matches index columns beyond the
-** the first nEqCol columns.
-**
-** All terms of the ORDER BY clause must be either ASC or DESC.  The
-** *pbRev value is set to 1 if the ORDER BY clause is all DESC and it is
-** set to 0 if the ORDER BY clause is all ASC.
-*/
-static Index *findSortingIndex(
-  Parse *pParse,
-  Table *pTab,            /* The table to be sorted */
-  int base,               /* Cursor number for pTab */
-  ExprList *pOrderBy,     /* The ORDER BY clause */
-  Index *pPreferredIdx,   /* Use this index, if possible and not NULL */
-  int nEqCol,             /* Number of index columns used with == constraints */
-  int *pbRev              /* Set to 1 if ORDER BY is DESC */
-){
-  int i, j;
-  Index *pMatch;
-  Index *pIdx;
-  int sortOrder;
-  sqlite3 *db = pParse->db;
-
-  assert( pOrderBy!=0 );
-  assert( pOrderBy->nExpr>0 );
-  sortOrder = pOrderBy->a[0].sortOrder;
-  for(i=0; i<pOrderBy->nExpr; i++){
-    Expr *p;
-    if( pOrderBy->a[i].sortOrder!=sortOrder ){
-      /* Indices can only be used if all ORDER BY terms are either
-      ** DESC or ASC.  Indices cannot be used on a mixture. */
-      return 0;
-    }
-    p = pOrderBy->a[i].pExpr;
-    if( p->op!=TK_COLUMN || p->iTable!=base ){
-      /* Can not use an index sort on anything that is not a column in the
-      ** left-most table of the FROM clause */
-      return 0;
-    }
-  }
-
-  /* If we get this far, it means the ORDER BY clause consists only of
-  ** ascending columns in the left-most table of the FROM clause.  Now
-  ** check for a matching index.
-  */
-  pMatch = 0;
-  for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
-    int nExpr = pOrderBy->nExpr;
-    if( pIdx->nColumn < nEqCol || pIdx->nColumn < nExpr ) continue;
-    for(i=j=0; i<nEqCol; i++){
-      CollSeq *pColl = sqlite3ExprCollSeq(pParse, pOrderBy->a[j].pExpr);
-      if( !pColl ) pColl = db->pDfltColl;
-      if( pPreferredIdx->aiColumn[i]!=pIdx->aiColumn[i] ) break;
-      if( pPreferredIdx->keyInfo.aColl[i]!=pIdx->keyInfo.aColl[i] ) break;
-      if( j<nExpr && 
-          pOrderBy->a[j].pExpr->iColumn==pIdx->aiColumn[i] &&
-          pColl==pIdx->keyInfo.aColl[i]
-      ){ 
-        j++; 
-      }
-    }
-    if( i<nEqCol ) continue;
-    for(i=0; i+j<nExpr; i++){
-      CollSeq *pColl = sqlite3ExprCollSeq(pParse, pOrderBy->a[i+j].pExpr);
-      if( !pColl ) pColl = db->pDfltColl;
-      if( pOrderBy->a[i+j].pExpr->iColumn!=pIdx->aiColumn[i+nEqCol] ||
-          pColl!=pIdx->keyInfo.aColl[i+nEqCol] ) break;
-    }
-    if( i+j>=nExpr ){
-      pMatch = pIdx;
-      if( pIdx==pPreferredIdx ) break;
-    }
-  }
-  if( pMatch && pbRev ){
-    *pbRev = sortOrder==SQLITE_SO_DESC;
-  }
-  return pMatch;
-}
-
-/*
-** Disable a term in the WHERE clause.  Except, do not disable the term
-** if it controls a LEFT OUTER JOIN and it did not originate in the ON
-** or USING clause of that join.
-**
-** Consider the term t2.z='ok' in the following queries:
-**
-**   (1)  SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.x WHERE t2.z='ok'
-**   (2)  SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.x AND t2.z='ok'
-**   (3)  SELECT * FROM t1, t2 WHERE t1.a=t2.x AND t2.z='ok'
-**
-** The t2.z='ok' is disabled in the in (2) because it did not originate
-** in the ON clause.  The term is disabled in (3) because it is not part
-** of a LEFT OUTER JOIN.  In (1), the term is not disabled.
-**
-** Disabling a term causes that term to not be tested in the inner loop
-** of the join.  Disabling is an optimization.  We would get the correct
-** results if nothing were ever disabled, but joins might run a little
-** slower.  The trick is to disable as much as we can without disabling
-** too much.  If we disabled in (1), we'd get the wrong answer.
-** See ticket #813.
-*/
-static void disableTerm(WhereLevel *pLevel, Expr **ppExpr){
-  Expr *pExpr = *ppExpr;
-  if( pLevel->iLeftJoin==0 || ExprHasProperty(pExpr, EP_FromJoin) ){
-    *ppExpr = 0;
-  }
-}
-
-/*
-** Generate code that builds a probe for an index.  Details:
-**
-**    *  Check the top nColumn entries on the stack.  If any
-**       of those entries are NULL, jump immediately to brk,
-**       which is the loop exit, since no index entry will match
-**       if any part of the key is NULL.
-**
-**    *  Construct a probe entry from the top nColumn entries in
-**       the stack with affinities appropriate for index pIdx.
-*/
-static void buildIndexProbe(Vdbe *v, int nColumn, int brk, Index *pIdx){
-  sqlite3VdbeAddOp(v, OP_NotNull, -nColumn, sqlite3VdbeCurrentAddr(v)+3);
-  sqlite3VdbeAddOp(v, OP_Pop, nColumn, 0);
-  sqlite3VdbeAddOp(v, OP_Goto, 0, brk);
-  sqlite3VdbeAddOp(v, OP_MakeRecord, nColumn, 0);
-  sqlite3IndexAffinityStr(v, pIdx);
-}
-
-/*
-** Generate code for an equality term of the WHERE clause.  An equality
-** term can be either X=expr  or X IN (...).   pTerm is the X.  
-*/
-static void codeEqualityTerm(
-  Parse *pParse,      /* The parsing context */
-  ExprInfo *pTerm,    /* The term of the WHERE clause to be coded */
-  int brk,            /* Jump here to abandon the loop */
-  WhereLevel *pLevel  /* When level of the FROM clause we are working on */
-){
-  Expr *pX = pTerm->p;
-  if( pX->op!=TK_IN ){
-    assert( pX->op==TK_EQ );
-    sqlite3ExprCode(pParse, pX->pRight);
-  }else{
-    int iTab = pX->iTable;
-    Vdbe *v = pParse->pVdbe;
-    sqlite3VdbeAddOp(v, OP_Rewind, iTab, brk);
-    sqlite3VdbeAddOp(v, OP_KeyAsData, iTab, 1);
-    pLevel->inP2 = sqlite3VdbeAddOp(v, OP_IdxColumn, iTab, 0);
-    pLevel->inOp = OP_Next;
-    pLevel->inP1 = iTab;
-  }
-  disableTerm(pLevel, &pTerm->p);
-}
-
-
-/*
-** Generate the beginning of the loop used for WHERE clause processing.
-** The return value is a pointer to an (opaque) structure that contains
-** information needed to terminate the loop.  Later, the calling routine
-** should invoke sqlite3WhereEnd() with the return value of this function
-** in order to complete the WHERE clause processing.
-**
-** If an error occurs, this routine returns NULL.
-**
-** The basic idea is to do a nested loop, one loop for each table in
-** the FROM clause of a select.  (INSERT and UPDATE statements are the
-** same as a SELECT with only a single table in the FROM clause.)  For
-** example, if the SQL is this:
-**
-**       SELECT * FROM t1, t2, t3 WHERE ...;
-**
-** Then the code generated is conceptually like the following:
-**
-**      foreach row1 in t1 do       \    Code generated
-**        foreach row2 in t2 do      |-- by sqlite3WhereBegin()
-**          foreach row3 in t3 do   /
-**            ...
-**          end                     \    Code generated
-**        end                        |-- by sqlite3WhereEnd()
-**      end                         /
-**
-** There are Btree cursors associated with each table.  t1 uses cursor
-** number pTabList->a[0].iCursor.  t2 uses the cursor pTabList->a[1].iCursor.
-** And so forth.  This routine generates code to open those VDBE cursors
-** and sqlite3WhereEnd() generates the code to close them.
-**
-** If the WHERE clause is empty, the foreach loops must each scan their
-** entire tables.  Thus a three-way join is an O(N^3) operation.  But if
-** the tables have indices and there are terms in the WHERE clause that
-** refer to those indices, a complete table scan can be avoided and the
-** code will run much faster.  Most of the work of this routine is checking
-** to see if there are indices that can be used to speed up the loop.
-**
-** Terms of the WHERE clause are also used to limit which rows actually
-** make it to the "..." in the middle of the loop.  After each "foreach",
-** terms of the WHERE clause that use only terms in that loop and outer
-** loops are evaluated and if false a jump is made around all subsequent
-** inner loops (or around the "..." if the test occurs within the inner-
-** most loop)
-**
-** OUTER JOINS
-**
-** An outer join of tables t1 and t2 is conceptally coded as follows:
-**
-**    foreach row1 in t1 do
-**      flag = 0
-**      foreach row2 in t2 do
-**        start:
-**          ...
-**          flag = 1
-**      end
-**      if flag==0 then
-**        move the row2 cursor to a null row
-**        goto start
-**      fi
-**    end
-**
-** ORDER BY CLAUSE PROCESSING
-**
-** *ppOrderBy is a pointer to the ORDER BY clause of a SELECT statement,
-** if there is one.  If there is no ORDER BY clause or if this routine
-** is called from an UPDATE or DELETE statement, then ppOrderBy is NULL.
-**
-** If an index can be used so that the natural output order of the table
-** scan is correct for the ORDER BY clause, then that index is used and
-** *ppOrderBy is set to NULL.  This is an optimization that prevents an
-** unnecessary sort of the result set if an index appropriate for the
-** ORDER BY clause already exists.
-**
-** If the where clause loops cannot be arranged to provide the correct
-** output order, then the *ppOrderBy is unchanged.
-*/
-WhereInfo *sqlite3WhereBegin(
-  Parse *pParse,       /* The parser context */
-  SrcList *pTabList,   /* A list of all tables to be scanned */
-  Expr *pWhere,        /* The WHERE clause */
-  int pushKey,         /* If TRUE, leave the table key on the stack */
-  ExprList **ppOrderBy /* An ORDER BY clause, or NULL */
-){
-  int i;                     /* Loop counter */
-  WhereInfo *pWInfo;         /* Will become the return value of this function */
-  Vdbe *v = pParse->pVdbe;   /* The virtual database engine */
-  int brk, cont = 0;         /* Addresses used during code generation */
-  int nExpr;           /* Number of subexpressions in the WHERE clause */
-  int loopMask;        /* One bit set for each outer loop */
-  int haveKey = 0;     /* True if KEY is on the stack */
-  ExprInfo *pTerm;     /* A single term in the WHERE clause; ptr to aExpr[] */
-  ExprMaskSet maskSet; /* The expression mask set */
-  int iDirectEq[32];   /* Term of the form ROWID==X for the N-th table */
-  int iDirectLt[32];   /* Term of the form ROWID<X or ROWID<=X */
-  int iDirectGt[32];   /* Term of the form ROWID>X or ROWID>=X */
-  ExprInfo aExpr[101]; /* The WHERE clause is divided into these terms */
-
-  /* pushKey is only allowed if there is a single table (as in an INSERT or
-  ** UPDATE statement)
-  */
-  assert( pushKey==0 || pTabList->nSrc==1 );
-
-  /* Split the WHERE clause into separate subexpressions where each
-  ** subexpression is separated by an AND operator.  If the aExpr[]
-  ** array fills up, the last entry might point to an expression which
-  ** contains additional unfactored AND operators.
-  */
-  initMaskSet(&maskSet);
-  memset(aExpr, 0, sizeof(aExpr));
-  nExpr = exprSplit(ARRAYSIZE(aExpr), aExpr, pWhere);
-  if( nExpr==ARRAYSIZE(aExpr) ){
-    sqlite3ErrorMsg(pParse, "WHERE clause too complex - no more "
-       "than %d terms allowed", (int)ARRAYSIZE(aExpr)-1);
-    return 0;
-  }
-  
-  /* Allocate and initialize the WhereInfo structure that will become the
-  ** return value.
-  */
-  pWInfo = sqliteMalloc( sizeof(WhereInfo) + pTabList->nSrc*sizeof(WhereLevel));
-  if( sqlite3_malloc_failed ){
-    /* sqliteFree(pWInfo); // Leak memory when malloc fails */
-    return 0;
-  }
-  pWInfo->pParse = pParse;
-  pWInfo->pTabList = pTabList;
-  pWInfo->iBreak = sqlite3VdbeMakeLabel(v);
-
-  /* Special case: a WHERE clause that is constant.  Evaluate the
-  ** expression and either jump over all of the code or fall thru.
-  */
-  if( pWhere && (pTabList->nSrc==0 || sqlite3ExprIsConstant(pWhere)) ){
-    sqlite3ExprIfFalse(pParse, pWhere, pWInfo->iBreak, 1);
-    pWhere = 0;
-  }
-
-  /* Analyze all of the subexpressions.
-  */
-  for(pTerm=aExpr, i=0; i<nExpr; i++, pTerm++){
-    TriggerStack *pStack;
-    exprAnalyze(pTabList, &maskSet, pTerm);
-
-    /* If we are executing a trigger body, remove all references to
-    ** new.* and old.* tables from the prerequisite masks.
-    */
-    if( (pStack = pParse->trigStack)!=0 ){
-      int x;
-      if( (x=pStack->newIdx) >= 0 ){
-        int mask = ~getMask(&maskSet, x);
-        pTerm->prereqRight &= mask;
-        pTerm->prereqLeft &= mask;
-        pTerm->prereqAll &= mask;
-      }
-      if( (x=pStack->oldIdx) >= 0 ){
-        int mask = ~getMask(&maskSet, x);
-        pTerm->prereqRight &= mask;
-        pTerm->prereqLeft &= mask;
-        pTerm->prereqAll &= mask;
-      }
-    }
-  }
-
-  /* Figure out what index to use (if any) for each nested loop.
-  ** Make pWInfo->a[i].pIdx point to the index to use for the i-th nested
-  ** loop where i==0 is the outer loop and i==pTabList->nSrc-1 is the inner
-  ** loop. 
-  **
-  ** If terms exist that use the ROWID of any table, then set the
-  ** iDirectEq[], iDirectLt[], or iDirectGt[] elements for that table
-  ** to the index of the term containing the ROWID.  We always prefer
-  ** to use a ROWID which can directly access a table rather than an
-  ** index which requires reading an index first to get the rowid then
-  ** doing a second read of the actual database table.
-  **
-  ** Actually, if there are more than 32 tables in the join, only the
-  ** first 32 tables are candidates for indices.  This is (again) due
-  ** to the limit of 32 bits in an integer bitmask.
-  */
-  loopMask = 0;
-  for(i=0; i<pTabList->nSrc && i<ARRAYSIZE(iDirectEq); i++){
-    int j;
-    WhereLevel *pLevel = &pWInfo->a[i];
-    int iCur = pTabList->a[i].iCursor;    /* The cursor for this table */
-    int mask = getMask(&maskSet, iCur);   /* Cursor mask for this table */
-    Table *pTab = pTabList->a[i].pTab;
-    Index *pIdx;
-    Index *pBestIdx = 0;
-    int bestScore = 0;
-
-    /* Check to see if there is an expression that uses only the
-    ** ROWID field of this table.  For terms of the form ROWID==expr
-    ** set iDirectEq[i] to the index of the term.  For terms of the
-    ** form ROWID<expr or ROWID<=expr set iDirectLt[i] to the term index.
-    ** For terms like ROWID>expr or ROWID>=expr set iDirectGt[i].
-    **
-    ** (Added:) Treat ROWID IN expr like ROWID=expr.
-    */
-    pLevel->iCur = -1;
-    iDirectEq[i] = -1;
-    iDirectLt[i] = -1;
-    iDirectGt[i] = -1;
-    for(pTerm=aExpr, j=0; j<nExpr; j++, pTerm++){
-      Expr *pX = pTerm->p;
-      if( pTerm->idxLeft==iCur && pX->pLeft->iColumn<0
-            && (pTerm->prereqRight & loopMask)==pTerm->prereqRight ){
-        switch( pX->op ){
-          case TK_IN:
-          case TK_EQ: iDirectEq[i] = j; break;
-          case TK_LE:
-          case TK_LT: iDirectLt[i] = j; break;
-          case TK_GE:
-          case TK_GT: iDirectGt[i] = j;  break;
-        }
-      }
-    }
-    if( iDirectEq[i]>=0 ){
-      loopMask |= mask;
-      pLevel->pIdx = 0;
-      continue;
-    }
-
-    /* Do a search for usable indices.  Leave pBestIdx pointing to
-    ** the "best" index.  pBestIdx is left set to NULL if no indices
-    ** are usable.
-    **
-    ** The best index is determined as follows.  For each of the
-    ** left-most terms that is fixed by an equality operator, add
-    ** 8 to the score.  The right-most term of the index may be
-    ** constrained by an inequality.  Add 1 if for an "x<..." constraint
-    ** and add 2 for an "x>..." constraint.  Chose the index that
-    ** gives the best score.
-    **
-    ** This scoring system is designed so that the score can later be
-    ** used to determine how the index is used.  If the score&7 is 0
-    ** then all constraints are equalities.  If score&1 is not 0 then
-    ** there is an inequality used as a termination key.  (ex: "x<...")
-    ** If score&2 is not 0 then there is an inequality used as the
-    ** start key.  (ex: "x>...").  A score or 4 is the special case
-    ** of an IN operator constraint.  (ex:  "x IN ...").
-    **
-    ** The IN operator (as in "<expr> IN (...)") is treated the same as
-    ** an equality comparison except that it can only be used on the
-    ** left-most column of an index and other terms of the WHERE clause
-    ** cannot be used in conjunction with the IN operator to help satisfy
-    ** other columns of the index.
-    */
-    for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
-      int eqMask = 0;  /* Index columns covered by an x=... term */
-      int ltMask = 0;  /* Index columns covered by an x<... term */
-      int gtMask = 0;  /* Index columns covered by an x>... term */
-      int inMask = 0;  /* Index columns covered by an x IN .. term */
-      int nEq, m, score;
-
-      if( pIdx->nColumn>32 ) continue;  /* Ignore indices too many columns */
-      for(pTerm=aExpr, j=0; j<nExpr; j++, pTerm++){
-        Expr *pX = pTerm->p;
-        CollSeq *pColl = sqlite3ExprCollSeq(pParse, pX->pLeft);
-        if( !pColl && pX->pRight ){
-          pColl = sqlite3ExprCollSeq(pParse, pX->pRight);
-        }
-        if( !pColl ){
-          pColl = pParse->db->pDfltColl;
-        }
-        if( pTerm->idxLeft==iCur 
-             && (pTerm->prereqRight & loopMask)==pTerm->prereqRight ){
-          int iColumn = pX->pLeft->iColumn;
-          int k;
-          char idxaff = pIdx->pTable->aCol[iColumn].affinity; 
-          for(k=0; k<pIdx->nColumn; k++){
-            /* If the collating sequences or affinities don't match, 
-            ** ignore this index.  */
-            if( pColl!=pIdx->keyInfo.aColl[k] ) continue;
-            if( !sqlite3IndexAffinityOk(pX, idxaff) ) continue;
-            if( pIdx->aiColumn[k]==iColumn ){
-              switch( pX->op ){
-                case TK_IN: {
-                  if( k==0 ) inMask |= 1;
-                  break;
-                }
-                case TK_EQ: {
-                  eqMask |= 1<<k;
-                  break;
-                }
-                case TK_LE:
-                case TK_LT: {
-                  ltMask |= 1<<k;
-                  break;
-                }
-                case TK_GE:
-                case TK_GT: {
-                  gtMask |= 1<<k;
-                  break;
-                }
-                default: {
-                  /* CANT_HAPPEN */
-                  assert( 0 );
-                  break;
-                }
-              }
-              break;
-            }
-          }
-        }
-      }
-
-      /* The following loop ends with nEq set to the number of columns
-      ** on the left of the index with == constraints.
-      */
-      for(nEq=0; nEq<pIdx->nColumn; nEq++){
-        m = (1<<(nEq+1))-1;
-        if( (m & eqMask)!=m ) break;
-      }
-      score = nEq*8;   /* Base score is 8 times number of == constraints */
-      m = 1<<nEq;
-      if( m & ltMask ) score++;    /* Increase score for a < constraint */
-      if( m & gtMask ) score+=2;   /* Increase score for a > constraint */
-      if( score==0 && inMask ) score = 4;  /* Default score for IN constraint */
-      if( score>bestScore ){
-        pBestIdx = pIdx;
-        bestScore = score;
-      }
-    }
-    pLevel->pIdx = pBestIdx;
-    pLevel->score = bestScore;
-    pLevel->bRev = 0;
-    loopMask |= mask;
-    if( pBestIdx ){
-      pLevel->iCur = pParse->nTab++;
-    }
-  }
-
-  /* Check to see if the ORDER BY clause is or can be satisfied by the
-  ** use of an index on the first table.
-  */
-  if( ppOrderBy && *ppOrderBy && pTabList->nSrc>0 ){
-     Index *pSortIdx;
-     Index *pIdx;
-     Table *pTab;
-     int bRev = 0;
-
-     pTab = pTabList->a[0].pTab;
-     pIdx = pWInfo->a[0].pIdx;
-     if( pIdx && pWInfo->a[0].score==4 ){
-       /* If there is already an IN index on the left-most table,
-       ** it will not give the correct sort order.
-       ** So, pretend that no suitable index is found.
-       */
-       pSortIdx = 0;
-     }else if( iDirectEq[0]>=0 || iDirectLt[0]>=0 || iDirectGt[0]>=0 ){
-       /* If the left-most column is accessed using its ROWID, then do
-       ** not try to sort by index.
-       */
-       pSortIdx = 0;
-     }else{
-       int nEqCol = (pWInfo->a[0].score+4)/8;
-       pSortIdx = findSortingIndex(pParse, pTab, pTabList->a[0].iCursor, 
-                                   *ppOrderBy, pIdx, nEqCol, &bRev);
-     }
-     if( pSortIdx && (pIdx==0 || pIdx==pSortIdx) ){
-       if( pIdx==0 ){
-         pWInfo->a[0].pIdx = pSortIdx;
-         pWInfo->a[0].iCur = pParse->nTab++;
-       }
-       pWInfo->a[0].bRev = bRev;
-       *ppOrderBy = 0;
-     }
-  }
-
-  /* Open all tables in the pTabList and all indices used by those tables.
-  */
-  sqlite3CodeVerifySchema(pParse, -1); /* Insert the cookie verifier Goto */
-  for(i=0; i<pTabList->nSrc; i++){
-    Table *pTab;
-    Index *pIx;
-
-    pTab = pTabList->a[i].pTab;
-    if( pTab->isTransient || pTab->pSelect ) continue;
-    sqlite3OpenTableForReading(v, pTabList->a[i].iCursor, pTab);
-    sqlite3CodeVerifySchema(pParse, pTab->iDb);
-    if( (pIx = pWInfo->a[i].pIdx)!=0 ){
-      sqlite3VdbeAddOp(v, OP_Integer, pIx->iDb, 0);
-      sqlite3VdbeOp3(v, OP_OpenRead, pWInfo->a[i].iCur, pIx->tnum,
-                     (char*)&pIx->keyInfo, P3_KEYINFO);
-    }
-  }
-
-  /* Generate the code to do the search
-  */
-  loopMask = 0;
-  for(i=0; i<pTabList->nSrc; i++){
-    int j, k;
-    int iCur = pTabList->a[i].iCursor;
-    Index *pIdx;
-    WhereLevel *pLevel = &pWInfo->a[i];
-
-    /* If this is the right table of a LEFT OUTER JOIN, allocate and
-    ** initialize a memory cell that records if this table matches any
-    ** row of the left table of the join.
-    */
-    if( i>0 && (pTabList->a[i-1].jointype & JT_LEFT)!=0 ){
-      if( !pParse->nMem ) pParse->nMem++;
-      pLevel->iLeftJoin = pParse->nMem++;
-      sqlite3VdbeAddOp(v, OP_String8, 0, 0);
-      sqlite3VdbeAddOp(v, OP_MemStore, pLevel->iLeftJoin, 1);
-      VdbeComment((v, "# init LEFT JOIN no-match flag"));
-    }
-
-    pIdx = pLevel->pIdx;
-    pLevel->inOp = OP_Noop;
-    if( i<ARRAYSIZE(iDirectEq) && (k = iDirectEq[i])>=0 ){
-      /* Case 1:  We can directly reference a single row using an
-      **          equality comparison against the ROWID field.  Or
-      **          we reference multiple rows using a "rowid IN (...)"
-      **          construct.
-      */
-      assert( k<nExpr );
-      pTerm = &aExpr[k];
-      assert( pTerm->p!=0 );
-      assert( pTerm->idxLeft==iCur );
-      brk = pLevel->brk = sqlite3VdbeMakeLabel(v);
-      codeEqualityTerm(pParse, pTerm, brk, pLevel);
-      cont = pLevel->cont = sqlite3VdbeMakeLabel(v);
-      sqlite3VdbeAddOp(v, OP_MustBeInt, 1, brk);
-      haveKey = 0;
-      sqlite3VdbeAddOp(v, OP_NotExists, iCur, brk);
-      pLevel->op = OP_Noop;
-    }else if( pIdx!=0 && pLevel->score>0 && pLevel->score%4==0 ){
-      /* Case 2:  There is an index and all terms of the WHERE clause that
-      **          refer to the index use the "==" or "IN" operators.
-      */
-      int start;
-      int nColumn = (pLevel->score+4)/8;
-      brk = pLevel->brk = sqlite3VdbeMakeLabel(v);
-
-      /* For each column of the index, find the term of the WHERE clause that
-      ** constraints that column.  If the WHERE clause term is X=expr, then
-      ** evaluation expr and leave the result on the stack */
-      for(j=0; j<nColumn; j++){
-        for(pTerm=aExpr, k=0; k<nExpr; k++, pTerm++){
-          Expr *pX = pTerm->p;
-          if( pX==0 ) continue;
-          if( pTerm->idxLeft==iCur
-             && (pTerm->prereqRight & loopMask)==pTerm->prereqRight 
-             && pX->pLeft->iColumn==pIdx->aiColumn[j]
-          ){
-            char idxaff = pIdx->pTable->aCol[pX->pLeft->iColumn].affinity;
-            if( sqlite3IndexAffinityOk(pX, idxaff) ){
-              codeEqualityTerm(pParse, pTerm, brk, pLevel);
-              break;
-            }
-          }
-        }
-      }
-      pLevel->iMem = pParse->nMem++;
-      cont = pLevel->cont = sqlite3VdbeMakeLabel(v);
-      buildIndexProbe(v, nColumn, brk, pIdx);
-      sqlite3VdbeAddOp(v, OP_MemStore, pLevel->iMem, 0);
-
-      /* Generate code (1) to move to the first matching element of the table.
-      ** Then generate code (2) that jumps to "brk" after the cursor is past
-      ** the last matching element of the table.  The code (1) is executed
-      ** once to initialize the search, the code (2) is executed before each
-      ** iteration of the scan to see if the scan has finished. */
-      if( pLevel->bRev ){
-        /* Scan in reverse order */
-        sqlite3VdbeAddOp(v, OP_MoveLe, pLevel->iCur, brk);
-        start = sqlite3VdbeAddOp(v, OP_MemLoad, pLevel->iMem, 0);
-        sqlite3VdbeAddOp(v, OP_IdxLT, pLevel->iCur, brk);
-        pLevel->op = OP_Prev;
-      }else{
-        /* Scan in the forward order */
-        sqlite3VdbeAddOp(v, OP_MoveGe, pLevel->iCur, brk);
-        start = sqlite3VdbeAddOp(v, OP_MemLoad, pLevel->iMem, 0);
-        sqlite3VdbeOp3(v, OP_IdxGE, pLevel->iCur, brk, "+", P3_STATIC);
-        pLevel->op = OP_Next;
-      }
-      sqlite3VdbeAddOp(v, OP_RowKey, pLevel->iCur, 0);
-      sqlite3VdbeAddOp(v, OP_IdxIsNull, nColumn, cont);
-      sqlite3VdbeAddOp(v, OP_IdxRecno, pLevel->iCur, 0);
-      if( i==pTabList->nSrc-1 && pushKey ){
-        haveKey = 1;
-      }else{
-        sqlite3VdbeAddOp(v, OP_MoveGe, iCur, 0);
-        haveKey = 0;
-      }
-      pLevel->p1 = pLevel->iCur;
-      pLevel->p2 = start;
-    }else if( i<ARRAYSIZE(iDirectLt) && (iDirectLt[i]>=0 || iDirectGt[i]>=0) ){
-      /* Case 3:  We have an inequality comparison against the ROWID field.
-      */
-      int testOp = OP_Noop;
-      int start;
-
-      brk = pLevel->brk = sqlite3VdbeMakeLabel(v);
-      cont = pLevel->cont = sqlite3VdbeMakeLabel(v);
-      if( iDirectGt[i]>=0 ){
-        Expr *pX;
-        k = iDirectGt[i];
-        assert( k<nExpr );
-        pTerm = &aExpr[k];
-        pX = pTerm->p;
-        assert( pX!=0 );
-        assert( pTerm->idxLeft==iCur );
-        sqlite3ExprCode(pParse, pX->pRight);
-        sqlite3VdbeAddOp(v, OP_ForceInt, pX->op==TK_LT || pX->op==TK_GT, brk);
-        sqlite3VdbeAddOp(v, OP_MoveGe, iCur, brk);
-        disableTerm(pLevel, &pTerm->p);
-      }else{
-        sqlite3VdbeAddOp(v, OP_Rewind, iCur, brk);
-      }
-      if( iDirectLt[i]>=0 ){
-        Expr *pX;
-        k = iDirectLt[i];
-        assert( k<nExpr );
-        pTerm = &aExpr[k];
-        pX = pTerm->p;
-        assert( pX!=0 );
-        assert( pTerm->idxLeft==iCur );
-        sqlite3ExprCode(pParse, pX->pRight);
-        pLevel->iMem = pParse->nMem++;
-        sqlite3VdbeAddOp(v, OP_MemStore, pLevel->iMem, 1);
-        if( pX->op==TK_LT || pX->op==TK_GT ){
-          testOp = OP_Ge;
-        }else{
-          testOp = OP_Gt;
-        }
-        disableTerm(pLevel, &pTerm->p);
-      }
-      start = sqlite3VdbeCurrentAddr(v);
-      pLevel->op = OP_Next;
-      pLevel->p1 = iCur;
-      pLevel->p2 = start;
-      if( testOp!=OP_Noop ){
-        sqlite3VdbeAddOp(v, OP_Recno, iCur, 0);
-        sqlite3VdbeAddOp(v, OP_MemLoad, pLevel->iMem, 0);
-        sqlite3VdbeAddOp(v, testOp, 0, brk);
-      }
-      haveKey = 0;
-    }else if( pIdx==0 ){
-      /* Case 4:  There is no usable index.  We must do a complete
-      **          scan of the entire database table.
-      */
-      int start;
-
-      brk = pLevel->brk = sqlite3VdbeMakeLabel(v);
-      cont = pLevel->cont = sqlite3VdbeMakeLabel(v);
-      sqlite3VdbeAddOp(v, OP_Rewind, iCur, brk);
-      start = sqlite3VdbeCurrentAddr(v);
-      pLevel->op = OP_Next;
-      pLevel->p1 = iCur;
-      pLevel->p2 = start;
-      haveKey = 0;
-    }else{
-      /* Case 5: The WHERE clause term that refers to the right-most
-      **         column of the index is an inequality.  For example, if
-      **         the index is on (x,y,z) and the WHERE clause is of the
-      **         form "x=5 AND y<10" then this case is used.  Only the
-      **         right-most column can be an inequality - the rest must
-      **         use the "==" operator.
-      **
-      **         This case is also used when there are no WHERE clause
-      **         constraints but an index is selected anyway, in order
-      **         to force the output order to conform to an ORDER BY.
-      */
-      int score = pLevel->score;
-      int nEqColumn = score/8;
-      int start;
-      int leFlag=0, geFlag=0;
-      int testOp;
-
-      /* Evaluate the equality constraints
-      */
-      for(j=0; j<nEqColumn; j++){
-        int iIdxCol = pIdx->aiColumn[j];
-        for(pTerm=aExpr, k=0; k<nExpr; k++, pTerm++){
-          Expr *pX = pTerm->p;
-          if( pX==0 ) continue;
-          if( pTerm->idxLeft==iCur
-             && pX->op==TK_EQ
-             && (pTerm->prereqRight & loopMask)==pTerm->prereqRight 
-             && pX->pLeft->iColumn==iIdxCol
-          ){
-            sqlite3ExprCode(pParse, pX->pRight);
-            disableTerm(pLevel, &pTerm->p);
-            break;
-          }
-        }
-      }
-
-      /* Duplicate the equality term values because they will all be
-      ** used twice: once to make the termination key and once to make the
-      ** start key.
-      */
-      for(j=0; j<nEqColumn; j++){
-        sqlite3VdbeAddOp(v, OP_Dup, nEqColumn-1, 0);
-      }
-
-      /* Labels for the beginning and end of the loop
-      */
-      cont = pLevel->cont = sqlite3VdbeMakeLabel(v);
-      brk = pLevel->brk = sqlite3VdbeMakeLabel(v);
-
-      /* Generate the termination key.  This is the key value that
-      ** will end the search.  There is no termination key if there
-      ** are no equality terms and no "X<..." term.
-      **
-      ** 2002-Dec-04: On a reverse-order scan, the so-called "termination"
-      ** key computed here really ends up being the start key.
-      */
-      if( (score & 1)!=0 ){
-        for(pTerm=aExpr, k=0; k<nExpr; k++, pTerm++){
-          Expr *pX = pTerm->p;
-          if( pX==0 ) continue;
-          if( pTerm->idxLeft==iCur
-             && (pX->op==TK_LT || pX->op==TK_LE)
-             && (pTerm->prereqRight & loopMask)==pTerm->prereqRight 
-             && pX->pLeft->iColumn==pIdx->aiColumn[j]
-          ){
-            sqlite3ExprCode(pParse, pX->pRight);
-            leFlag = pX->op==TK_LE;
-            disableTerm(pLevel, &pTerm->p);
-            break;
-          }
-        }
-        testOp = OP_IdxGE;
-      }else{
-        testOp = nEqColumn>0 ? OP_IdxGE : OP_Noop;
-        leFlag = 1;
-      }
-      if( testOp!=OP_Noop ){
-        int nCol = nEqColumn + (score & 1);
-        pLevel->iMem = pParse->nMem++;
-        buildIndexProbe(v, nCol, brk, pIdx);
-        if( pLevel->bRev ){
-          int op = leFlag ? OP_MoveLe : OP_MoveLt;
-          sqlite3VdbeAddOp(v, op, pLevel->iCur, brk);
-        }else{
-          sqlite3VdbeAddOp(v, OP_MemStore, pLevel->iMem, 1);
-        }
-      }else if( pLevel->bRev ){
-        sqlite3VdbeAddOp(v, OP_Last, pLevel->iCur, brk);
-      }
-
-      /* Generate the start key.  This is the key that defines the lower
-      ** bound on the search.  There is no start key if there are no
-      ** equality terms and if there is no "X>..." term.  In
-      ** that case, generate a "Rewind" instruction in place of the
-      ** start key search.
-      **
-      ** 2002-Dec-04: In the case of a reverse-order search, the so-called
-      ** "start" key really ends up being used as the termination key.
-      */
-      if( (score & 2)!=0 ){
-        for(pTerm=aExpr, k=0; k<nExpr; k++, pTerm++){
-          Expr *pX = pTerm->p;
-          if( pX==0 ) continue;
-          if( pTerm->idxLeft==iCur
-             && (pX->op==TK_GT || pX->op==TK_GE)
-             && (pTerm->prereqRight & loopMask)==pTerm->prereqRight 
-             && pX->pLeft->iColumn==pIdx->aiColumn[j]
-          ){
-            sqlite3ExprCode(pParse, pX->pRight);
-            geFlag = pX->op==TK_GE;
-            disableTerm(pLevel, &pTerm->p);
-            break;
-          }
-        }
-      }else{
-        geFlag = 1;
-      }
-      if( nEqColumn>0 || (score&2)!=0 ){
-        int nCol = nEqColumn + ((score&2)!=0);
-        buildIndexProbe(v, nCol, brk, pIdx);
-        if( pLevel->bRev ){
-          pLevel->iMem = pParse->nMem++;
-          sqlite3VdbeAddOp(v, OP_MemStore, pLevel->iMem, 1);
-          testOp = OP_IdxLT;
-        }else{
-          int op = geFlag ? OP_MoveGe : OP_MoveGt;
-          sqlite3VdbeAddOp(v, op, pLevel->iCur, brk);
-        }
-      }else if( pLevel->bRev ){
-        testOp = OP_Noop;
-      }else{
-        sqlite3VdbeAddOp(v, OP_Rewind, pLevel->iCur, brk);
-      }
-
-      /* Generate the the top of the loop.  If there is a termination
-      ** key we have to test for that key and abort at the top of the
-      ** loop.
-      */
-      start = sqlite3VdbeCurrentAddr(v);
-      if( testOp!=OP_Noop ){
-        sqlite3VdbeAddOp(v, OP_MemLoad, pLevel->iMem, 0);
-        sqlite3VdbeAddOp(v, testOp, pLevel->iCur, brk);
-        if( (leFlag && !pLevel->bRev) || (!geFlag && pLevel->bRev) ){
-          sqlite3VdbeChangeP3(v, -1, "+", P3_STATIC);
-        }
-      }
-      sqlite3VdbeAddOp(v, OP_RowKey, pLevel->iCur, 0);
-      sqlite3VdbeAddOp(v, OP_IdxIsNull, nEqColumn + (score & 1), cont);
-      sqlite3VdbeAddOp(v, OP_IdxRecno, pLevel->iCur, 0);
-      if( i==pTabList->nSrc-1 && pushKey ){
-        haveKey = 1;
-      }else{
-        sqlite3VdbeAddOp(v, OP_MoveGe, iCur, 0);
-        haveKey = 0;
-      }
-
-      /* Record the instruction used to terminate the loop.
-      */
-      pLevel->op = pLevel->bRev ? OP_Prev : OP_Next;
-      pLevel->p1 = pLevel->iCur;
-      pLevel->p2 = start;
-    }
-    loopMask |= getMask(&maskSet, iCur);
-
-    /* Insert code to test every subexpression that can be completely
-    ** computed using the current set of tables.
-    */
-    for(pTerm=aExpr, j=0; j<nExpr; j++, pTerm++){
-      if( pTerm->p==0 ) continue;
-      if( (pTerm->prereqAll & loopMask)!=pTerm->prereqAll ) continue;
-      if( pLevel->iLeftJoin && !ExprHasProperty(pTerm->p,EP_FromJoin) ){
-        continue;
-      }
-      if( haveKey ){
-        haveKey = 0;
-        sqlite3VdbeAddOp(v, OP_MoveGe, iCur, 0);
-      }
-      sqlite3ExprIfFalse(pParse, pTerm->p, cont, 1);
-      pTerm->p = 0;
-    }
-    brk = cont;
-
-    /* For a LEFT OUTER JOIN, generate code that will record the fact that
-    ** at least one row of the right table has matched the left table.  
-    */
-    if( pLevel->iLeftJoin ){
-      pLevel->top = sqlite3VdbeCurrentAddr(v);
-      sqlite3VdbeAddOp(v, OP_Integer, 1, 0);
-      sqlite3VdbeAddOp(v, OP_MemStore, pLevel->iLeftJoin, 1);
-      VdbeComment((v, "# record LEFT JOIN hit"));
-      for(pTerm=aExpr, j=0; j<nExpr; j++, pTerm++){
-        if( pTerm->p==0 ) continue;
-        if( (pTerm->prereqAll & loopMask)!=pTerm->prereqAll ) continue;
-        if( haveKey ){
-          /* Cannot happen.  "haveKey" can only be true if pushKey is true
-          ** an pushKey can only be true for DELETE and UPDATE and there are
-          ** no outer joins with DELETE and UPDATE.
-          */
-          haveKey = 0;
-          sqlite3VdbeAddOp(v, OP_MoveGe, iCur, 0);
-        }
-        sqlite3ExprIfFalse(pParse, pTerm->p, cont, 1);
-        pTerm->p = 0;
-      }
-    }
-  }
-  pWInfo->iContinue = cont;
-  if( pushKey && !haveKey ){
-    sqlite3VdbeAddOp(v, OP_Recno, pTabList->a[0].iCursor, 0);
-  }
-  freeMaskSet(&maskSet);
-  return pWInfo;
-}
-
-/*
-** Generate the end of the WHERE loop.  See comments on 
-** sqlite3WhereBegin() for additional information.
-*/
-void sqlite3WhereEnd(WhereInfo *pWInfo){
-  Vdbe *v = pWInfo->pParse->pVdbe;
-  int i;
-  WhereLevel *pLevel;
-  SrcList *pTabList = pWInfo->pTabList;
-
-  for(i=pTabList->nSrc-1; i>=0; i--){
-    pLevel = &pWInfo->a[i];
-    sqlite3VdbeResolveLabel(v, pLevel->cont);
-    if( pLevel->op!=OP_Noop ){
-      sqlite3VdbeAddOp(v, pLevel->op, pLevel->p1, pLevel->p2);
-    }
-    sqlite3VdbeResolveLabel(v, pLevel->brk);
-    if( pLevel->inOp!=OP_Noop ){
-      sqlite3VdbeAddOp(v, pLevel->inOp, pLevel->inP1, pLevel->inP2);
-    }
-    if( pLevel->iLeftJoin ){
-      int addr;
-      addr = sqlite3VdbeAddOp(v, OP_MemLoad, pLevel->iLeftJoin, 0);
-      sqlite3VdbeAddOp(v, OP_NotNull, 1, addr+4 + (pLevel->iCur>=0));
-      sqlite3VdbeAddOp(v, OP_NullRow, pTabList->a[i].iCursor, 0);
-      if( pLevel->iCur>=0 ){
-        sqlite3VdbeAddOp(v, OP_NullRow, pLevel->iCur, 0);
-      }
-      sqlite3VdbeAddOp(v, OP_Goto, 0, pLevel->top);
-    }
-  }
-  sqlite3VdbeResolveLabel(v, pWInfo->iBreak);
-  for(i=0; i<pTabList->nSrc; i++){
-    Table *pTab = pTabList->a[i].pTab;
-    assert( pTab!=0 );
-    if( pTab->isTransient || pTab->pSelect ) continue;
-    pLevel = &pWInfo->a[i];
-    sqlite3VdbeAddOp(v, OP_Close, pTabList->a[i].iCursor, 0);
-    if( pLevel->pIdx!=0 ){
-      sqlite3VdbeAddOp(v, OP_Close, pLevel->iCur, 0);
-    }
-  }
-  sqliteFree(pWInfo);
-  return;
-}