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Fix a crash in handling queries of the form "SELECT aggregate(DISTINCT tbl.col) FROM ... LEFT JOIN tbl ...". Fixes a problem introduced by [ef4ac0ddd297bbd3].

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FossilOrigin-Name: 0dcf808ddf23da834da724d88b1715ed06565f1f1290713ff42a3fcf6ffb802e
This commit is contained in:
dan
2021-04-03 19:23:59 +00:00
parent 9af69ff547
commit f330d53ff3
6 changed files with 37 additions and 20 deletions
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7
src/where.c
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@@ -5025,9 +5025,7 @@ WhereInfo *sqlite3WhereBegin(
/* Attempt to omit tables from the join that do not affect the result.
** For a table to not affect the result, the following must be true:
**
** 1) The query must not be an aggregate. Or it must be an aggregate
** that contains only one aggregate function with the DISTINCT
** qualifier. e.g. "SELECT count(DISTINCT ...) FROM".
** 1) The query must not be an aggregate.
** 2) The table must be the RHS of a LEFT JOIN.
** 3) Either the query must be DISTINCT, or else the ON or USING clause
** must contain a constraint that limits the scan of the table to
@@ -5055,7 +5053,8 @@ WhereInfo *sqlite3WhereBegin(
*/
notReady = ~(Bitmask)0;
if( pWInfo->nLevel>=2
&& pResultSet!=0 /* guarantees condition (1) above */
&& pResultSet!=0 /* these two combine to guarantee */
&& 0==(wctrlFlags & WHERE_AGG_DISTINCT) /* condition (1) above */
&& OptimizationEnabled(db, SQLITE_OmitNoopJoin)
){
int i;