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Diffstat (limited to 'src/backend/optimizer/plan/planner.c')
| -rw-r--r-- | src/backend/optimizer/plan/planner.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/backend/optimizer/plan/planner.c b/src/backend/optimizer/plan/planner.c index a8c8edfac75..41bd8353430 100644 --- a/src/backend/optimizer/plan/planner.c +++ b/src/backend/optimizer/plan/planner.c @@ -8308,6 +8308,15 @@ create_unique_paths(PlannerInfo *root, RelOptInfo *rel, SpecialJoinInfo *sjinfo) return NULL; /* + * Punt if this is a child relation and we failed to build a unique-ified + * relation for its parent. This can happen if all the RHS columns were + * found to be equated to constants when unique-ifying the parent table, + * leaving no columns to unique-ify. + */ + if (IS_OTHER_REL(rel) && rel->top_parent->unique_rel == NULL) + return NULL; + + /* * When called during GEQO join planning, we are in a short-lived memory * context. We must make sure that the unique rel and any subsidiary data * structures created for a baserel survive the GEQO cycle, else the |