diff options
Diffstat (limited to 'src/backend/optimizer/prep/prepunion.c')
| -rw-r--r-- | src/backend/optimizer/prep/prepunion.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/backend/optimizer/prep/prepunion.c b/src/backend/optimizer/prep/prepunion.c index f82ab27b9aa..3d9c9768cc3 100644 --- a/src/backend/optimizer/prep/prepunion.c +++ b/src/backend/optimizer/prep/prepunion.c @@ -217,6 +217,9 @@ recurse_set_operations(Node *setOp, PlannerInfo *root, Assert(subquery != NULL); + /* plan_params should not be in use in current query level */ + Assert(root->plan_params == NIL); + /* * Generate plan for primitive subquery */ @@ -226,6 +229,13 @@ recurse_set_operations(Node *setOp, PlannerInfo *root, &subroot); /* + * It should not be possible for the primitive query to contain any + * cross-references to other primitive queries in the setop tree. + */ + if (root->plan_params) + elog(ERROR, "unexpected outer reference in set operation subquery"); + + /* * Estimate number of groups if caller wants it. If the subquery used * grouping or aggregation, its output is probably mostly unique * anyway; otherwise do statistical estimation. |