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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.

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src/backend/utils/adt
- selfuncs.c

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`‎src/backend/utils/adt/selfuncs.c‎`

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Original file line number	Diff line number	Diff line change
`@@ -4505,6 +4505,12 @@ examine_simple_variable(PlannerInfo root, Var var,`
`4505`	`4505`	`RelOptInfo*rel;`
`4506`	`4506`	`TargetEntry*ste;`
`4507`	`4507`
	`4508`	`+/*`
	`4509`	`+ * Punt if it's a whole-row var rather than a plain column reference.`
	`4510`	`+ */`
	`4511`	`+if (var->varattno==InvalidAttrNumber)`
	`4512`	`+return;`
	`4513`	`+`
`4508`	`4514`	`/*`
`4509`	`4515`	`* Punt if subquery uses set operations or GROUP BY, as these will`
`4510`	`4516`	`* mash underlying columns' stats beyond recognition. (Set ops are`

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Commitebefbb5

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`‎src/backend/utils/adt/selfuncs.c‎`

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