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Performance enhancement for single-table queries with many OR-connected

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WHERE clause terms and multiple indexes with the same left-most columns.

FossilOrigin-Name: 1461d543ac8a3e4a54405067893146c74576bb4e
This commit is contained in:
drh
2014-12-04 20:24:50 +00:00
parent 72673a24e2
commit 1d32488037
4 changed files with 45 additions and 11 deletions
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5
src/where.c
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@@ -3591,10 +3591,9 @@ static Bitmask codeOneLoopStart(
Expr *pExpr = pWC->a[iTerm].pExpr;
if( &pWC->a[iTerm] == pTerm ) continue;
if( ExprHasProperty(pExpr, EP_FromJoin) ) continue;
testcase( pWC->a[iTerm].wtFlags & TERM_ORINFO );
testcase( pWC->a[iTerm].wtFlags & TERM_VIRTUAL );
if( pWC->a[iTerm].wtFlags & (TERM_ORINFO|TERM_VIRTUAL) ) continue;
if( (pWC->a[iTerm].wtFlags & TERM_VIRTUAL)!=0 ) continue;
if( (pWC->a[iTerm].eOperator & WO_ALL)==0 ) continue;
testcase( pWC->a[iTerm].wtFlags & TERM_ORINFO );
pExpr = sqlite3ExprDup(db, pExpr, 0);
pAndExpr = sqlite3ExprAnd(db, pAndExpr, pExpr);
}