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Add support for partial indices.

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FossilOrigin-Name: 478113f18b1d28606b107b5a0bed04cb90a82cf2
This commit is contained in:
drh
2013-08-02 16:41:02 +00:00
parent 0b22101b2f 1e7d43c977
commit b47e07f1c1
18 changed files with 579 additions and 169 deletions
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26
src/where.c
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@@ -1128,7 +1128,7 @@ static int isLikeOrGlob(
if( op==TK_VARIABLE ){
Vdbe *pReprepare = pParse->pReprepare;
int iCol = pRight->iColumn;
pVal = sqlite3VdbeGetValue(pReprepare, iCol, SQLITE_AFF_NONE);
pVal = sqlite3VdbeGetBoundValue(pReprepare, iCol, SQLITE_AFF_NONE);
if( pVal && sqlite3_value_type(pVal)==SQLITE_TEXT ){
z = (char *)sqlite3_value_text(pVal);
}
@@ -2235,7 +2235,7 @@ static void constructAutomaticIndex(
/* Fill the automatic index with content */
addrTop = sqlite3VdbeAddOp1(v, OP_Rewind, pLevel->iTabCur);
regRecord = sqlite3GetTempReg(pParse);
sqlite3GenerateIndexKey(pParse, pIdx, pLevel->iTabCur, regRecord, 1);
sqlite3GenerateIndexKey(pParse, pIdx, pLevel->iTabCur, regRecord, 1, 0);
sqlite3VdbeAddOp2(v, OP_IdxInsert, pLevel->iIdxCur, regRecord);
sqlite3VdbeChangeP5(v, OPFLAG_USESEEKRESULT);
sqlite3VdbeAddOp2(v, OP_Next, pLevel->iTabCur, addrTop+1);
@@ -2592,7 +2592,7 @@ static int valueFromExpr(
){
int iVar = pExpr->iColumn;
sqlite3VdbeSetVarmask(pParse->pVdbe, iVar);
*pp = sqlite3VdbeGetValue(pParse->pReprepare, iVar, aff);
*pp = sqlite3VdbeGetBoundValue(pParse->pReprepare, iVar, aff);
return SQLITE_OK;
}
return sqlite3ValueFromExpr(pParse->db, pExpr, SQLITE_UTF8, aff, pp);
@@ -4504,6 +4504,17 @@ static Bitmask columnsInIndex(Index *pIdx){
return m;
}
/* Check to see if a partial index with pPartIndexWhere can be used
** in the current query. Return true if it can be and false if not.
*/
static int whereUsablePartialIndex(int iTab, WhereClause *pWC, Expr *pWhere){
int i;
WhereTerm *pTerm;
for(i=0, pTerm=pWC->a; i<pWC->nTerm; i++, pTerm++){
if( sqlite3ExprImpliesExpr(pTerm->pExpr, pWhere, iTab) ) return 1;
}
return 0;
}
/*
** Add all WhereLoop objects for a single table of the join where the table
@@ -4527,11 +4538,13 @@ static int whereLoopAddBtree(
int b; /* A boolean value */
WhereCost rSize; /* number of rows in the table */
WhereCost rLogSize; /* Logarithm of the number of rows in the table */
WhereClause *pWC; /* The parsed WHERE clause */
pNew = pBuilder->pNew;
pWInfo = pBuilder->pWInfo;
pTabList = pWInfo->pTabList;
pSrc = pTabList->a + pNew->iTab;
pWC = pBuilder->pWC;
assert( !IsVirtual(pSrc->pTab) );
if( pSrc->pIndex ){
@@ -4571,7 +4584,6 @@ static int whereLoopAddBtree(
&& !pSrc->isCorrelated
){
/* Generate auto-index WhereLoops */
WhereClause *pWC = pBuilder->pWC;
WhereTerm *pTerm;
WhereTerm *pWCEnd = pWC->a + pWC->nTerm;
for(pTerm=pWC->a; rc==SQLITE_OK && pTerm<pWCEnd; pTerm++){
@@ -4601,6 +4613,10 @@ static int whereLoopAddBtree(
/* Loop over all indices
*/
for(; rc==SQLITE_OK && pProbe; pProbe=pProbe->pNext, iSortIdx++){
if( pProbe->pPartIdxWhere!=0
&& !whereUsablePartialIndex(pNew->iTab, pWC, pProbe->pPartIdxWhere) ){
continue; /* Partial index inappropriate for this query */
}
pNew->u.btree.nEq = 0;
pNew->nLTerm = 0;
pNew->iSortIdx = 0;
@@ -5541,7 +5557,7 @@ static int whereShortCut(WhereLoopBuilder *pBuilder){
pLoop->rRun = 33; /* 33==whereCost(10) */
}else{
for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
if( pIdx->onError==OE_None ) continue;
if( pIdx->onError==OE_None || pIdx->pPartIdxWhere!=0 ) continue;
for(j=0; j<pIdx->nColumn; j++){
pTerm = findTerm(pWC, iCur, pIdx->aiColumn[j], 0, WO_EQ, pIdx);
if( pTerm==0 ) break;