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Commit79edb2b

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Fix recursion into previously planned sub-query in examine_simple_variable.
This code was looking at the sub-Query tree as seen in the parent query'sRangeTblEntry; but that's the pristine parser output, and what we need tolook at is the tree as it stands at the completion of planning. Otherwisewe might pick up a Var that references a subquery that got flattened andhence has no RelOptInfo in the subroot. Per report from Peter Geoghegan.
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‎src/backend/utils/adt/selfuncs.c

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@@ -4382,6 +4382,17 @@ examine_simple_variable(PlannerInfo *root, Var *var,
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/* Subquery should have been planned already */
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Assert(rel->subroot&&IsA(rel->subroot,PlannerInfo));
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/*
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* Switch our attention to the subquery as mangled by the planner.
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* It was okay to look at the pre-planning version for the tests
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* above, but now we need a Var that will refer to the subroot's
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* live RelOptInfos. For instance, if any subquery pullup happened
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* during planning, Vars in the targetlist might have gotten replaced,
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* and we need to see the replacement expressions.
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*/
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subquery=rel->subroot->parse;
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Assert(IsA(subquery,Query));
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/* Get the subquery output expression referenced by the upper Var */
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ste=get_tle_by_resno(subquery->targetList,var->varattno);
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if (ste==NULL||ste->resjunk)

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