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Make the query planners use of partial indexes based on bound variables

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responsive to the SQLITE_DBCONFIG_ENABLE_QPSG setting.

FossilOrigin-Name: a934dd14ac55177ac541423f4a077484bb3b461b60c9c2e88d067cca922fa2bc
This commit is contained in:
drh
2017-06-28 18:25:03 +00:00
parent 37f906087b
commit 3e380a4485
4 changed files with 31 additions and 16 deletions
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6
src/where.c
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@@ -2687,14 +2687,16 @@ static Bitmask columnsInIndex(Index *pIdx){
static int whereUsablePartialIndex(int iTab, WhereClause *pWC, Expr *pWhere){
int i;
WhereTerm *pTerm;
Parse *pParse = pWC->pWInfo->pParse;
while( pWhere->op==TK_AND ){
if( !whereUsablePartialIndex(iTab,pWC,pWhere->pLeft) ) return 0;
pWhere = pWhere->pRight;
}
if( pParse->db->flags & SQLITE_EnableQPSG ) pParse = 0;
for(i=0, pTerm=pWC->a; i<pWC->nTerm; i++, pTerm++){
Expr *pExpr = pTerm->pExpr;
if( sqlite3ExprImpliesExpr(pWC->pWInfo->pParse, pExpr, pWhere, iTab)
&& (!ExprHasProperty(pExpr, EP_FromJoin) || pExpr->iRightJoinTable==iTab)
if( (!ExprHasProperty(pExpr, EP_FromJoin) || pExpr->iRightJoinTable==iTab)
&& sqlite3ExprImpliesExpr(pParse, pExpr, pWhere, iTab)
){
return 1;
}