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Fill out an initial implementation of the sqlite3ExprImpliesExpr() function.

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FossilOrigin-Name: 8e07aa2ad5579aeb82174ce5bd432ddb9c058bc1
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drh
2013-08-01 13:04:46 +00:00
parent cf0fd4a5fd
commit 619a1305e7
7 changed files with 59 additions and 33 deletions
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4
src/select.c
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@@ -4177,7 +4177,7 @@ int sqlite3Select(
** Use the SQLITE_GroupByOrder flag with SQLITE_TESTCTRL_OPTIMIZER
** to disable this optimization for testing purposes.
*/
if( sqlite3ExprListCompare(p->pGroupBy, pOrderBy)==0
if( sqlite3ExprListCompare(p->pGroupBy, pOrderBy, -1)==0
&& OptimizationEnabled(db, SQLITE_GroupByOrder) ){
pOrderBy = 0;
}
@@ -4198,7 +4198,7 @@ int sqlite3Select(
** BY and DISTINCT, and an index or separate temp-table for the other.
*/
if( (p->selFlags & (SF_Distinct|SF_Aggregate))==SF_Distinct
&& sqlite3ExprListCompare(pOrderBy, p->pEList)==0
&& sqlite3ExprListCompare(pOrderBy, p->pEList, -1)==0
){
p->selFlags &= ~SF_Distinct;
p->pGroupBy = sqlite3ExprListDup(db, p->pEList, 0);