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Diffstat (limited to 'src/backend/optimizer/path/allpaths.c')
| -rw-r--r-- | src/backend/optimizer/path/allpaths.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c index 86d5bb71b0a..474cd7b6eba 100644 --- a/src/backend/optimizer/path/allpaths.c +++ b/src/backend/optimizer/path/allpaths.c @@ -1159,7 +1159,9 @@ set_subquery_pathlist(PlannerInfo *root, RelOptInfo *rel, /* * It's possible that constraint exclusion proved the subquery empty. If * so, it's convenient to turn it back into a dummy path so that we will - * recognize appropriate optimizations at this level. + * recognize appropriate optimizations at this query level. (But see + * create_append_plan in createplan.c, which has to reverse this + * substitution.) */ if (is_dummy_plan(rel->subplan)) { |