diff options
Diffstat (limited to 'src/backend/optimizer/util/clauses.c')
| -rw-r--r-- | src/backend/optimizer/util/clauses.c | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/src/backend/optimizer/util/clauses.c b/src/backend/optimizer/util/clauses.c index d589dc2544b..3dedee6d699 100644 --- a/src/backend/optimizer/util/clauses.c +++ b/src/backend/optimizer/util/clauses.c @@ -1162,21 +1162,19 @@ max_parallel_hazard_walker(Node *node, max_parallel_hazard_context *context) } /* - * Since we don't have the ability to push subplans down to workers at - * present, we treat subplan references as parallel-restricted. We need - * not worry about examining their contents; if they are unsafe, we would - * have found that out while examining the whole tree before reduction of - * sublinks to subplans. (Really we should not see SubLink during a - * max_interesting == restricted scan, but if we do, return true.) + * Really we should not see SubLink during a max_interesting == restricted + * scan, but if we do, return true. */ - else if (IsA(node, SubLink) || - IsA(node, SubPlan) || - IsA(node, AlternativeSubPlan)) + else if (IsA(node, SubLink)) { if (max_parallel_hazard_test(PROPARALLEL_RESTRICTED, context)) return true; } + /* We can push the subplans only if they are parallel-safe. */ + else if (IsA(node, SubPlan)) + return !((SubPlan *) node)->parallel_safe; + /* * We can't pass Params to workers at the moment either, so they are also * parallel-restricted. |