diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/optimizer/prep/prepunion.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/src/backend/optimizer/prep/prepunion.c b/src/backend/optimizer/prep/prepunion.c index 0d3a739175a..45ecde416f9 100644 --- a/src/backend/optimizer/prep/prepunion.c +++ b/src/backend/optimizer/prep/prepunion.c @@ -1682,13 +1682,13 @@ adjust_appendrel_attrs_mutator(Node *node, AppendRelInfo *context) /* * Reset cached derivative fields, since these might need to have - * different values when considering the child relation. + * different values when considering the child relation. Note we + * don't reset left_ec/right_ec: each child variable is implicitly + * equivalent to its parent, so still a member of the same EC if any. */ newinfo->eval_cost.startup = -1; newinfo->norm_selec = -1; newinfo->outer_selec = -1; - newinfo->left_ec = NULL; - newinfo->right_ec = NULL; newinfo->left_em = NULL; newinfo->right_em = NULL; newinfo->scansel_cache = NIL; |