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Fix failure with whole-row reference to a subquery.

Simple oversight in commit1cb108e ---recursively examining a subquery output column is only sane if theoriginal Var refers to a single output column. Found by Kevin Grittner.

1 parentc6ec879 commit449d5acCopy full SHA for 449d5ac

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src/backend/utils/adt
- selfuncs.c

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`‎src/backend/utils/adt/selfuncs.c`

Lines changed: 6 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -4502,6 +4502,12 @@ examine_simple_variable(PlannerInfo root, Var var,`
`4502`	`4502`	`RelOptInfo*rel;`
`4503`	`4503`	`TargetEntry*ste;`
`4504`	`4504`
	`4505`	`+/*`
	`4506`	`+ * Punt if it's a whole-row var rather than a plain column reference.`
	`4507`	`+ */`
	`4508`	`+if (var->varattno==InvalidAttrNumber)`
	`4509`	`+return;`
	`4510`	`+`
`4505`	`4511`	`/*`
`4506`	`4512`	`* Punt if subquery uses set operations or GROUP BY, as these will`
`4507`	`4513`	`* mash underlying columns' stats beyond recognition. (Set ops are`

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Commit449d5ac

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`‎src/backend/utils/adt/selfuncs.c`

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