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Fix failure with whole-row reference to a subquery.

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Simple oversight in commit 1cb108efb0 ---
recursively examining a subquery output column is only sane if the
original Var refers to a single output column.  Found by Kevin Grittner.
This commit is contained in:
Tom Lane
2013-11-11 16:36:27 -05:00
parent c6ec8793aa
commit 449d5acd7d
1 changed files with 6 additions and 0 deletions
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6
src/backend/utils/adt/selfuncs.c
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@ -4502,6 +4502,12 @@ examine_simple_variable(PlannerInfo *root, Var *var,
RelOptInfo *rel; RelOptInfo *rel;
TargetEntry *ste; TargetEntry *ste;
/*
* Punt if it's a whole-row var rather than a plain column reference.
*/
if (var->varattno == InvalidAttrNumber)
return;
/* /*
* Punt if subquery uses set operations or GROUP BY, as these will * Punt if subquery uses set operations or GROUP BY, as these will
* mash underlying columns' stats beyond recognition. (Set ops are * mash underlying columns' stats beyond recognition. (Set ops are