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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2021-04-20 11:32:02 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2021-04-20 11:32:02 -0400 |
| commit | 7bfba4f1933003716d432d29d4d228bcf28e2e70 (patch) | |
| tree | 3ce9f1591698c88d727ed3de330ab2abf935220f /src/include/optimizer/paths.h | |
| parent | bf5d1f1e0052100b716f7b7b0934aefb28f72e73 (diff) | |
Fix planner failure in some cases of sorting by an aggregate.
An oversight introduced by the incremental-sort patches caused
"could not find pathkey item to sort" errors in some situations
where a sort key involves an aggregate or window function.
The basic problem here is that find_em_expr_usable_for_sorting_rel
isn't properly modeling what prepare_sort_from_pathkeys will do
later. Rather than hoping we can keep those functions in sync,
let's refactor so that they actually share the code for
identifying a suitable sort expression.
With this refactoring, tlist.c's tlist_member_ignore_relabel
is unused. I removed it in HEAD but left it in place in v13,
in case any extensions are using it.
Per report from Luc Vlaming. Back-patch to v13 where the
problem arose.
James Coleman and Tom Lane
Discussion: https://postgr.es/m/91f3ec99-85a4-fa55-ea74-33f85a5c651f@swarm64.com
Diffstat (limited to 'src/include/optimizer/paths.h')
| -rw-r--r-- | src/include/optimizer/paths.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/include/optimizer/paths.h b/src/include/optimizer/paths.h index ea405d4e154..9254ee088b4 100644 --- a/src/include/optimizer/paths.h +++ b/src/include/optimizer/paths.h @@ -135,6 +135,14 @@ extern EquivalenceClass *get_eclass_for_sort_expr(PlannerInfo *root, Index sortref, Relids rel, bool create_it); +extern EquivalenceMember *find_ec_member_matching_expr(EquivalenceClass *ec, + Expr *expr, + Relids relids); +extern EquivalenceMember *find_computable_ec_member(PlannerInfo *root, + EquivalenceClass *ec, + List *exprs, + Relids relids, + bool require_parallel_safe); extern Expr *find_em_expr_for_rel(EquivalenceClass *ec, RelOptInfo *rel); extern Expr *find_em_expr_usable_for_sorting_rel(PlannerInfo *root, EquivalenceClass *ec, |