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Diffstat (limited to 'src/backend/optimizer/plan/createplan.c')
| -rw-r--r-- | src/backend/optimizer/plan/createplan.c | 9 |
1 files changed, 2 insertions, 7 deletions
diff --git a/src/backend/optimizer/plan/createplan.c b/src/backend/optimizer/plan/createplan.c index 6b64c4a362d..fe5a323cfd7 100644 --- a/src/backend/optimizer/plan/createplan.c +++ b/src/backend/optimizer/plan/createplan.c @@ -1987,16 +1987,11 @@ create_gather_merge_plan(PlannerInfo *root, GatherMergePath *best_path) &gm_plan->collations, &gm_plan->nullsFirst); - /* * All gather merge paths should have already guaranteed the necessary - * sort order either by adding an explicit sort node or by using presorted - * input. We can't simply add a sort here on additional pathkeys, because - * we can't guarantee the sort would be safe. For example, expressions may - * be volatile or otherwise parallel unsafe. + * sort order. See create_gather_merge_path. */ - if (!pathkeys_contained_in(pathkeys, best_path->subpath->pathkeys)) - elog(ERROR, "gather merge input not sufficiently sorted"); + Assert(pathkeys_contained_in(pathkeys, best_path->subpath->pathkeys)); /* Now insert the subplan under GatherMerge. */ gm_plan->plan.lefttree = subplan; |