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Fix incorrect tlist generation in create_gather_plan().

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This function is written as though Gather doesn't project; but it does.
Even if it did not project, though, we must use build_path_tlist to ensure
that the output columns receive correct sortgroupref labeling.

Per report from Amit Kapila.
This commit is contained in:
Tom Lane 2016-03-09 10:56:36 -05:00
parent aa09cd242f
commit 8776c15c85
1 changed files with 8 additions and 2 deletions
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10
src/backend/optimizer/plan/createplan.c
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@ -1360,11 +1360,17 @@ create_gather_plan(PlannerInfo *root, GatherPath *best_path)
{
Gather *gather_plan;
Plan *subplan;
List *tlist;
/* Must insist that all children return the same tlist */
/*
* Although the Gather node can project, we prefer to push down such work
* to its child node, so demand an exact tlist from the child.
*/
subplan = create_plan_recurse(root, best_path->subpath, CP_EXACT_TLIST);
gather_plan = make_gather(subplan->targetlist,
tlist = build_path_tlist(root, &best_path->path);
gather_plan = make_gather(tlist,
NIL,
best_path->path.parallel_degree,
best_path->single_copy,