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Refactoring of the query optimizer in advance of adding better optimization. (CVS 2551)

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FossilOrigin-Name: 57c6bd3760163c174be4a2ece58f414e82b55938
This commit is contained in:
drh
2005-07-19 17:38:22 +00:00
parent 0aa74edd72
commit 0fcef5e110
4 changed files with 186 additions and 172 deletions
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14
manifest
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@@ -1,5 +1,5 @@
C Allow\san\sunlimited\snumber\sof\sterms\sin\sthe\sWHERE\sclause.\s\sThe\sold\slimit\swas\s100.\s(CVS\s2550)
D 2005-07-16T13:33:21
C Refactoring\sof\sthe\squery\soptimizer\sin\sadvance\sof\sadding\sbetter\soptimization.\s(CVS\s2551)
D 2005-07-19T17:38:23
F Makefile.in 22ea9c0fe748f591712d8fe3c6d972c6c173a165
F Makefile.linux-gcc 06be33b2a9ad4f005a5f42b22c4a19dab3cbb5c7
F README 9c4e2d6706bdcc3efdd773ce752a8cdab4f90028
@@ -64,7 +64,7 @@ F src/random.c 90adff4e73a3b249eb4f1fc2a6ff9cf78c7233a4
F src/select.c c611471052773b94af771693686bd5bcdbbb0dba
F src/shell.c 25b3217d7c64e6497225439d261a253a23efff26
F src/sqlite.h.in 838382ed6b48d392366a55e07f49d9d71263e1fe
F src/sqliteInt.h af65e8fac1fe8f6f78a65551081bafd49f6e0650
F src/sqliteInt.h 97d50f5714a5f5a8190b871305e33a96c4638a8a
F src/table.c 25b3ff2b39b7d87e8d4a5da0713d68dfc06cbee9
F src/tclsqlite.c cccaf6b78c290d824cf8ea089b8b27377e545830
F src/test1.c 1dea8df4abb846cb3a2ce8a6e13d8b32dbd31b16
@@ -85,7 +85,7 @@ F src/vdbeapi.c 7f392f0792d1258c958083d7de9eae7c3530c9a6
F src/vdbeaux.c 3732a86566a6be4da4c606e9334baf3fd98667af
F src/vdbefifo.c b8805850afe13b43f1de78d58088cb5d66f88e1e
F src/vdbemem.c da8e8d6f29dd1323f782f000d7cd120027c9ff03
F src/where.c 9b02e75ef86f057cee5e93150b10cbc1092d7de6
F src/where.c 1da2268f5e37257276dff46ebbc1cc596a9efaa1
F tclinstaller.tcl 046e3624671962dc50f0481d7c25b38ef803eb42
F test/all.test 7f0988442ab811dfa41793b5b550f5828ce316f3
F test/alter.test 9d6837a3d946b73df692b7cef2a7644d2e2f6bc6
@@ -286,7 +286,7 @@ F www/tclsqlite.tcl 425be741b8ae664f55cb1ef2371aab0a75109cf9
F www/vdbe.tcl 87a31ace769f20d3627a64fa1fade7fed47b90d0
F www/version3.tcl a99cf5f6d8bd4d5537584a2b342f0fb9fa601d8b
F www/whentouse.tcl 528299b8316726dbcc5548e9aa0648c8b1bd055b
P 578490c91331a386f84652db0b3bfd74c82046e1
R 544e009ea316e2cccd816cc597a10aab
P ca69f36832d57775e73ac5cdbe0a32d7b759432b
R 9a4258be8ecf1889fef260cdd1d2d34b
U drh
Z 0b48c3e07c6ac902e7fb79f1e0cbf3a1
Z a631f1b7791a9c3a4f6bac427d47518f

2
manifest.uuid
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@@ -1 +1 @@
ca69f36832d57775e73ac5cdbe0a32d7b759432b
57c6bd3760163c174be4a2ece58f414e82b55938

3
src/sqliteInt.h
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@@ -11,7 +11,7 @@
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.393 2005/07/09 02:16:03 drh Exp $
** @(#) $Id: sqliteInt.h,v 1.394 2005/07/19 17:38:23 drh Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_
@@ -845,7 +845,6 @@ struct Expr {
#define EP_Error 0x08 /* Expression contains one or more errors */
#define EP_Not 0x10 /* Operator preceeded by NOT */
#define EP_VarSelect 0x20 /* pSelect is correlated, not constant */
#define EP_OptOnly 0x40 /* A constraint used by the optimizer only */
/*
** These macros can be used to test, set, or clear bits in the

339
src/where.c
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@@ -16,7 +16,7 @@
** so is applicable. Because this module is responsible for selecting
** indices, you might also think of this module as the "query optimizer".
**
** $Id: where.c,v 1.145 2005/07/16 13:33:21 drh Exp $
** $Id: where.c,v 1.146 2005/07/19 17:38:23 drh Exp $
*/
#include "sqliteInt.h"
@@ -30,22 +30,29 @@
*/
#define ARRAYSIZE(X) (sizeof(X)/sizeof(X[0]))
/* Forward reference
*/
typedef struct WhereClause WhereClause;
/*
** 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.
**
** The idxLeft and idxRight fields are the VDBE cursor numbers for the
** table that contains the column that appears on the left-hand and
** right-hand side of WhereTerm.p. If either side of WhereTerm.p is
** something other than a simple column reference, then idxLeft or
** idxRight are -1.
** All WhereTerms are collected into a single WhereClause structure.
** The following identity holds:
**
** It is the VDBE cursor number is the value stored in Expr.iTable
** when Expr.op==TK_COLUMN and the value stored in SrcList.a[].iCursor.
** WhereTerm.pWC->a[WhereTerm.idx] == WhereTerm
**
** prereqLeft, prereqRight, and prereqAll record sets of cursor numbers,
** When a term is of the form:
**
** X <op> <expr>
**
** where X is a column name and <op> is one of certain operators,
** then WhereTerm.leftCursor and WhereTerm.leftColumn record the
** cursor number and column number for X.
**
** prereqRight and prereqAll record sets of cursor numbers,
** but they do so indirectly. A single ExprMaskSet structure translates
** cursor number into bits and the translated bit is stored in the prereq
** fields. The translation is used in order to maximize the number of
@@ -56,34 +63,17 @@
** beginning with 0 in order to make the best possible use of the available
** bits in the Bitmask. So, in the example above, the cursor numbers
** would be mapped into integers 0 through 7.
**
** prereqLeft tells us every VDBE cursor that is referenced on the
** left-hand side of WhereTerm.p. prereqRight does the same for the
** right-hand side of the expression. The following identity always
** holds:
**
** prereqAll = prereqLeft | prereqRight
**
** The WhereTerm.indexable field is true if the WhereTerm.p expression
** is of a form that might control an index. Indexable expressions
** look like this:
**
** <column> <op> <expr>
**
** Where <column> is a simple column name and <op> is on of the operators
** that allowedOp() recognizes.
*/
typedef struct WhereTerm WhereTerm;
struct WhereTerm {
Expr *p; /* Pointer to the subexpression */
Expr *pExpr; /* Pointer to the subexpression */
u16 idx; /* Index of this term in pWC->a[] */
i16 iPartner; /* Disable pWC->a[iPartner] when this term disabled */
u16 flags; /* Bit flags. See below */
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 a column of any table */
short int idxRight; /* p->pRight is a column in this table number. -1 if
** p->pRight is not a column of any table */
Bitmask prereqLeft; /* Bitmask of tables referenced by p->pLeft */
Bitmask prereqRight; /* Bitmask of tables referenced by p->pRight */
i16 leftCursor; /* Cursor number of X in "X <op> <expr>" */
i16 leftColumn; /* Column number of X in "X <op> <expr>" */
WhereClause *pWC; /* The clause this term is part of */
Bitmask prereqRight; /* Bitmask of tables used by pRight */
Bitmask prereqAll; /* Bitmask of tables referenced by p */
};
@@ -92,12 +82,12 @@ struct WhereTerm {
*/
#define TERM_DYNAMIC 0x0001 /* Need to call sqlite3ExprDelete(p) */
#define TERM_VIRTUAL 0x0002 /* Added by the optimizer. Do not code */
#define TERM_CODED 0x0004 /* This term is already coded */
/*
** An instance of the following structure holds all information about a
** WHERE clause. Mostly this is a container for one or more WhereTerms.
*/
typedef struct WhereClause WhereClause;
struct WhereClause {
int nTerm; /* Number of terms */
int nSlot; /* Number of entries in a[] */
@@ -156,7 +146,7 @@ static void whereClauseClear(WhereClause *pWC){
WhereTerm *a;
for(i=pWC->nTerm-1, a=pWC->a; i>=0; i--, a++){
if( a->flags & TERM_DYNAMIC ){
sqlite3ExprDelete(a->p);
sqlite3ExprDelete(a->pExpr);
}
}
if( pWC->a!=pWC->aStatic ){
@@ -168,21 +158,26 @@ static void whereClauseClear(WhereClause *pWC){
** Add a new entries to the WhereClause structure. Increase the allocated
** space as necessary.
*/
static void whereClauseInsert(WhereClause *pWC, Expr *p, int flags){
static WhereTerm *whereClauseInsert(WhereClause *pWC, Expr *p, int flags){
WhereTerm *pTerm;
if( pWC->nTerm>=pWC->nSlot ){
WhereTerm *pOld = pWC->a;
pWC->a = sqliteMalloc( sizeof(pWC->a[0])*pWC->nSlot*2 );
if( pWC->a==0 ) return;
if( pWC->a==0 ) return 0;
memcpy(pWC->a, pOld, sizeof(pWC->a[0])*pWC->nTerm);
if( pOld!=pWC->aStatic ){
sqliteFree(pOld);
}
pWC->nSlot *= 2;
}
pTerm = &pWC->a[pWC->nTerm++];
pTerm->p = p;
pTerm = &pWC->a[pWC->nTerm];
pTerm->idx = pWC->nTerm;
pWC->nTerm++;
pTerm->pExpr = p;
pTerm->flags = flags;
pTerm->pWC = pWC;
pTerm->iPartner = -1;
return pTerm;
}
/*
@@ -233,11 +228,15 @@ static Bitmask getMask(ExprMaskSet *pMaskSet, int iCursor){
/*
** Create a new mask for cursor iCursor.
**
** There is one cursor per table in the FROM clause. The number of
** tables in the FROM clause is limited by a test early in the
** sqlite3WhereBegin() routien. So we know that the pMaskSet->ix[]
** array will never overflow.
*/
static void createMask(ExprMaskSet *pMaskSet, int iCursor){
if( pMaskSet->n<ARRAYSIZE(pMaskSet->ix) ){
pMaskSet->ix[pMaskSet->n++] = iCursor;
}
assert( pMaskSet->n < ARRAYSIZE(pMaskSet->ix) );
pMaskSet->ix[pMaskSet->n++] = iCursor;
}
/*
@@ -305,21 +304,28 @@ static int allowedOp(int op){
#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.
** Commute a comparision operator. Expressions of the form "X op Y"
** are converted into "Y op X".
*/
static int tableOrder(SrcList *pList, int iCur){
int i;
struct SrcList_item *pItem;
for(i=0, pItem=pList->a; i<pList->nSrc; i++, pItem++){
if( pItem->iCursor==iCur ) return i;
static void exprCommute(Expr *pExpr){
assert(
pExpr->op==TK_EQ ||
pExpr->op==TK_NE ||
pExpr->op==TK_LT ||
pExpr->op==TK_LE ||
pExpr->op==TK_GT ||
pExpr->op==TK_GE
);
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;
}
return -1;
}
/*
@@ -328,53 +334,52 @@ static int tableOrder(SrcList *pList, int iCur){
** subexpression and populate all the other fields of the WhereTerm
** structure.
*/
static void exprAnalyze(SrcList *pSrc, ExprMaskSet *pMaskSet, WhereTerm *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;
static void exprAnalyze(
SrcList *pSrc, /* the FROM clause */
ExprMaskSet *pMaskSet, /* table masks */
WhereTerm *pTerm /* the WHERE clause term to be analyzed */
){
Expr *pExpr = pTerm->pExpr;
Bitmask prereqLeft;
Bitmask prereqAll;
int idxRight;
prereqLeft = exprTableUsage(pMaskSet, pExpr->pLeft);
pTerm->prereqRight = exprTableUsage(pMaskSet, pExpr->pRight);
pTerm->prereqAll = prereqAll = exprTableUsage(pMaskSet, pExpr);
pTerm->leftCursor = -1;
pTerm->iPartner = -1;
idxRight = -1;
if( allowedOp(pExpr->op) && (pTerm->prereqRight & prereqLeft)==0 ){
Expr *pLeft = pExpr->pLeft;
Expr *pRight = pExpr->pRight;
if( pLeft->op==TK_COLUMN ){
pTerm->leftCursor = pLeft->iTable;
pTerm->leftColumn = pLeft->iColumn;
}
if( pExpr->pLeft->op==TK_COLUMN ){
pInfo->idxLeft = pExpr->pLeft->iTable;
pInfo->indexable = 1;
if( pRight && pRight->op==TK_COLUMN ){
WhereTerm *pNew;
Expr *pDup;
if( pTerm->leftCursor>=0 ){
pDup = sqlite3ExprDup(pExpr);
pNew = whereClauseInsert(pTerm->pWC, pDup, TERM_VIRTUAL|TERM_DYNAMIC);
if( pNew==0 ) return;
pNew->iPartner = pTerm->idx;
}else{
pDup = pExpr;
pNew = pTerm;
}
exprCommute(pDup);
pLeft = pDup->pLeft;
pNew->leftCursor = pLeft->iTable;
pNew->leftColumn = pLeft->iColumn;
pNew->prereqRight = prereqLeft;
pNew->prereqAll = prereqAll;
}
}
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);
}
}
}
/*
** This routine decides if pIdx can be used to satisfy the ORDER BY
** clause. If it can, it returns 1. If pIdx cannot satisfy the
@@ -515,10 +520,15 @@ static int sortableByRowid(
** 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;
static void disableTerm(WhereLevel *pLevel, WhereTerm *pTerm){
if( pTerm
&& (pTerm->flags & TERM_CODED)==0
&& (pLevel->iLeftJoin==0 || ExprHasProperty(pTerm->pExpr, EP_FromJoin))
){
pTerm->flags |= TERM_CODED;
if( pTerm->iPartner>=0 ){
disableTerm(pLevel, &pTerm->pWC->a[pTerm->iPartner]);
}
}
}
@@ -551,7 +561,7 @@ static void codeEqualityTerm(
int brk, /* Jump here to abandon the loop */
WhereLevel *pLevel /* When level of the FROM clause we are working on */
){
Expr *pX = pTerm->p;
Expr *pX = pTerm->pExpr;
if( pX->op!=TK_IN ){
assert( pX->op==TK_EQ );
sqlite3ExprCode(pParse, pX->pRight);
@@ -569,7 +579,7 @@ static void codeEqualityTerm(
pLevel->inP1 = iTab;
#endif
}
disableTerm(pLevel, &pTerm->p);
disableTerm(pLevel, pTerm);
}
#ifdef SQLITE_TEST
@@ -678,7 +688,7 @@ WhereInfo *sqlite3WhereBegin(
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 */
Bitmask loopMask; /* One bit set for each outer loop */
Bitmask loopMask; /* One bit cleared for each outer loop */
WhereTerm *pTerm; /* A single term in the WHERE clause */
ExprMaskSet maskSet; /* The expression mask set */
int iDirectEq[BMS]; /* Term of the form ROWID==X for the N-th table */
@@ -732,8 +742,8 @@ WhereInfo *sqlite3WhereBegin(
for(i=0; i<pTabList->nSrc; i++){
createMask(&maskSet, pTabList->a[i].iCursor);
}
for(pTerm=wc.a, i=0; i<wc.nTerm; i++, pTerm++){
exprAnalyze(pTabList, &maskSet, pTerm);
for(i=wc.nTerm-1; i>=0; i--){
exprAnalyze(pTabList, &maskSet, &wc.a[i]);
}
/* Figure out what index to use (if any) for each nested loop.
@@ -752,7 +762,7 @@ WhereInfo *sqlite3WhereBegin(
** first 32 tables are candidates for indices. This is (again) due
** to the limit of 32 bits in an integer bitmask.
*/
loopMask = 0;
loopMask = ~(Bitmask)0;
pTabItem = pTabList->a;
pLevel = pWInfo->a;
for(i=0; i<pTabList->nSrc && i<ARRAYSIZE(iDirectEq); i++,pTabItem++,pLevel++){
@@ -778,10 +788,9 @@ WhereInfo *sqlite3WhereBegin(
iDirectLt[i] = -1;
iDirectGt[i] = -1;
for(pTerm=wc.a, j=0; j<wc.nTerm; j++, pTerm++){
Expr *pX = pTerm->p;
if( pTerm->idxLeft==iCur && pX->pLeft->iColumn<0
&& (pTerm->prereqRight & loopMask)==pTerm->prereqRight ){
switch( pX->op ){
if( pTerm->leftCursor==iCur && pTerm->leftColumn<0
&& (pTerm->prereqRight & loopMask)==0 ){
switch( pTerm->pExpr->op ){
case TK_IN:
case TK_EQ: iDirectEq[i] = j; break;
case TK_LE:
@@ -798,7 +807,7 @@ WhereInfo *sqlite3WhereBegin(
** an index. We will always use the ROWID over an index.
*/
if( iDirectEq[i]>=0 ){
loopMask |= mask;
loopMask &= ~mask;
pLevel->pIdx = 0;
continue;
}
@@ -849,7 +858,7 @@ WhereInfo *sqlite3WhereBegin(
continue; /* Ignore indices with too many columns to analyze */
}
for(pTerm=wc.a, j=0; j<wc.nTerm; j++, pTerm++){
Expr *pX = pTerm->p;
Expr *pX = pTerm->pExpr;
CollSeq *pColl = sqlite3ExprCollSeq(pParse, pX->pLeft);
if( !pColl && pX->pRight ){
pColl = sqlite3ExprCollSeq(pParse, pX->pRight);
@@ -857,9 +866,8 @@ WhereInfo *sqlite3WhereBegin(
if( !pColl ){
pColl = pParse->db->pDfltColl;
}
if( pTerm->idxLeft==iCur
&& (pTerm->prereqRight & loopMask)==pTerm->prereqRight ){
int iColumn = pX->pLeft->iColumn;
if( pTerm->leftCursor==iCur && (pTerm->prereqRight & loopMask)==0 ){
int iColumn = pTerm->leftColumn;
int k;
char idxaff = iColumn>=0 ? pIdx->pTable->aCol[iColumn].affinity : 0;
for(k=0; k<pIdx->nColumn; k++){
@@ -952,7 +960,7 @@ WhereInfo *sqlite3WhereBegin(
pLevel->pIdx = pBestIdx;
pLevel->score = bestScore;
pLevel->bRev = bestRev;
loopMask |= mask;
loopMask &= ~mask;
if( pBestIdx ){
pLevel->iIdxCur = pParse->nTab++;
}
@@ -1070,7 +1078,7 @@ WhereInfo *sqlite3WhereBegin(
/* Generate the code to do the search
*/
loopMask = 0;
loopMask = ~(Bitmask)0;
pLevel = pWInfo->a;
pTabItem = pTabList->a;
for(i=0; i<pTabList->nSrc; i++, pTabItem++, pLevel++){
@@ -1109,8 +1117,8 @@ WhereInfo *sqlite3WhereBegin(
*/
assert( k<wc.nTerm );
pTerm = &wc.a[k];
assert( pTerm->p!=0 );
assert( pTerm->idxLeft==iCur );
assert( pTerm->pExpr!=0 );
assert( pTerm->leftCursor==iCur );
assert( omitTable==0 );
brk = pLevel->brk = sqlite3VdbeMakeLabel(v);
codeEqualityTerm(pParse, pTerm, brk, pLevel);
@@ -1132,14 +1140,15 @@ WhereInfo *sqlite3WhereBegin(
** generate code to evaluate expr and leave the result on the stack */
for(j=0; j<nColumn; j++){
for(pTerm=wc.a, k=0; k<wc.nTerm; 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]
Expr *pX = pTerm->pExpr;
assert( pX );
if( pTerm->leftCursor==iCur
&& (pTerm->prereqRight & loopMask)==0
&& pTerm->leftColumn==pIdx->aiColumn[j]
&& (pX->op==TK_EQ || pX->op==TK_IN)
){
char idxaff = pIdx->pTable->aCol[pX->pLeft->iColumn].affinity;
char idxaff = pIdx->pTable->aCol[pTerm->leftColumn].affinity;
assert( (pTerm->flags & TERM_CODED)==0 );
if( sqlite3IndexAffinityOk(pX, idxaff) ){
codeEqualityTerm(pParse, pTerm, brk, pLevel);
break;
@@ -1198,14 +1207,14 @@ WhereInfo *sqlite3WhereBegin(
k = iDirectGt[i];
assert( k<wc.nTerm );
pTerm = &wc.a[k];
pX = pTerm->p;
pX = pTerm->pExpr;
assert( pX!=0 );
assert( pTerm->idxLeft==iCur );
assert( pTerm->leftCursor==iCur );
sqlite3ExprCode(pParse, pX->pRight);
sqlite3VdbeAddOp(v, OP_ForceInt, pX->op==TK_LE || pX->op==TK_GT, brk);
sqlite3VdbeAddOp(v, bRev ? OP_MoveLt : OP_MoveGe, iCur, brk);
VdbeComment((v, "pk"));
disableTerm(pLevel, &pTerm->p);
disableTerm(pLevel, pTerm);
}else{
sqlite3VdbeAddOp(v, bRev ? OP_Last : OP_Rewind, iCur, brk);
}
@@ -1214,9 +1223,9 @@ WhereInfo *sqlite3WhereBegin(
k = iDirectLt[i];
assert( k<wc.nTerm );
pTerm = &wc.a[k];
pX = pTerm->p;
pX = pTerm->pExpr;
assert( pX!=0 );
assert( pTerm->idxLeft==iCur );
assert( pTerm->leftCursor==iCur );
sqlite3ExprCode(pParse, pX->pRight);
pLevel->iMem = pParse->nMem++;
sqlite3VdbeAddOp(v, OP_MemStore, pLevel->iMem, 1);
@@ -1225,7 +1234,7 @@ WhereInfo *sqlite3WhereBegin(
}else{
testOp = bRev ? OP_Lt : OP_Gt;
}
disableTerm(pLevel, &pTerm->p);
disableTerm(pLevel, pTerm);
}
start = sqlite3VdbeCurrentAddr(v);
pLevel->op = bRev ? OP_Prev : OP_Next;
@@ -1280,18 +1289,19 @@ WhereInfo *sqlite3WhereBegin(
for(j=0; j<nEqColumn; j++){
int iIdxCol = pIdx->aiColumn[j];
for(pTerm=wc.a, k=0; k<wc.nTerm; 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
Expr *pX;
if( pTerm->leftCursor==iCur
&& pTerm->leftColumn==iIdxCol
&& (pX = pTerm->pExpr)->op==TK_EQ
&& (pTerm->prereqRight & loopMask)==0
){
assert( (pTerm->flags & TERM_CODED)==0 );
sqlite3ExprCode(pParse, pX->pRight);
disableTerm(pLevel, &pTerm->p);
disableTerm(pLevel, pTerm);
break;
}
}
assert( k<wc.nTerm );
}
/* Duplicate the equality term values because they will all be
@@ -1316,19 +1326,21 @@ WhereInfo *sqlite3WhereBegin(
*/
if( (score & 4)!=0 ){
for(pTerm=wc.a, k=0; k<wc.nTerm; k++, pTerm++){
Expr *pX = pTerm->p;
if( pX==0 ) continue;
if( pTerm->idxLeft==iCur
Expr *pX = pTerm->pExpr;
assert( pX );
if( pTerm->leftCursor==iCur
&& (pX->op==TK_LT || pX->op==TK_LE)
&& (pTerm->prereqRight & loopMask)==pTerm->prereqRight
&& pX->pLeft->iColumn==pIdx->aiColumn[j]
&& (pTerm->prereqRight & loopMask)==0
&& pTerm->leftColumn==pIdx->aiColumn[j]
){
assert( (pTerm->flags & TERM_CODED)==0 );
sqlite3ExprCode(pParse, pX->pRight);
leFlag = pX->op==TK_LE;
disableTerm(pLevel, &pTerm->p);
disableTerm(pLevel, pTerm);
break;
}
}
assert( k<wc.nTerm );
testOp = OP_IdxGE;
}else{
testOp = nEqColumn>0 ? OP_IdxGE : OP_Noop;
@@ -1359,16 +1371,17 @@ WhereInfo *sqlite3WhereBegin(
*/
if( (score & 8)!=0 ){
for(pTerm=wc.a, k=0; k<wc.nTerm; k++, pTerm++){
Expr *pX = pTerm->p;
if( pX==0 ) continue;
if( pTerm->idxLeft==iCur
Expr *pX = pTerm->pExpr;
assert( pX );
if( pTerm->leftCursor==iCur
&& (pX->op==TK_GT || pX->op==TK_GE)
&& (pTerm->prereqRight & loopMask)==pTerm->prereqRight
&& pX->pLeft->iColumn==pIdx->aiColumn[j]
&& (pTerm->prereqRight & loopMask)==0
&& pTerm->leftColumn==pIdx->aiColumn[j]
){
assert( (pTerm->flags & TERM_CODED)==0 );
sqlite3ExprCode(pParse, pX->pRight);
geFlag = pX->op==TK_GE;
disableTerm(pLevel, &pTerm->p);
disableTerm(pLevel, pTerm);
break;
}
}
@@ -1417,20 +1430,22 @@ WhereInfo *sqlite3WhereBegin(
pLevel->p1 = iIdxCur;
pLevel->p2 = start;
}
loopMask |= getMask(&maskSet, iCur);
loopMask &= ~getMask(&maskSet, iCur);
/* Insert code to test every subexpression that can be completely
** computed using the current set of tables.
*/
for(pTerm=wc.a, j=0; j<wc.nTerm; j++, pTerm++){
Expr *pE = pTerm->p;
if( pE==0 || ExprHasProperty(pE, EP_OptOnly) ) continue;
if( (pTerm->prereqAll & loopMask)!=pTerm->prereqAll ) continue;
for(pTerm=wc.a, j=wc.nTerm; j>0; j--, pTerm++){
Expr *pE;
if( pTerm->flags & (TERM_VIRTUAL|TERM_CODED) ) continue;
if( (pTerm->prereqAll & loopMask)!=0 ) continue;
pE = pTerm->pExpr;
assert( pE!=0 );
if( pLevel->iLeftJoin && !ExprHasProperty(pE, EP_FromJoin) ){
continue;
}
sqlite3ExprIfFalse(pParse, pE, cont, 1);
pTerm->p = 0;
pTerm->flags |= TERM_CODED;
}
brk = cont;
@@ -1443,11 +1458,11 @@ WhereInfo *sqlite3WhereBegin(
sqlite3VdbeAddOp(v, OP_MemStore, pLevel->iLeftJoin, 1);
VdbeComment((v, "# record LEFT JOIN hit"));
for(pTerm=wc.a, j=0; j<wc.nTerm; j++, pTerm++){
Expr *pE = pTerm->p;
if( pE==0 || ExprHasProperty(pE, EP_OptOnly) ) continue;
if( (pTerm->prereqAll & loopMask)!=pTerm->prereqAll ) continue;
sqlite3ExprIfFalse(pParse, pE, cont, 1);
pTerm->p = 0;
if( pTerm->flags & (TERM_VIRTUAL|TERM_CODED) ) continue;
if( (pTerm->prereqAll & loopMask)!=0 ) continue;
assert( pTerm->pExpr );
sqlite3ExprIfFalse(pParse, pTerm->pExpr, cont, 1);
pTerm->flags |= TERM_CODED;
}
}
}