database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-11-09 06:21:09 +03:00
Code Activity

Enable use of Memoize atop an Append that came from UNION ALL.

Browse Source 
create_append_path() would only apply get_baserel_parampathinfo
when the path is for a partitioned table, but it's also potentially
useful for paths for UNION ALL appendrels.  Specifically, that
supports building a Memoize path atop this one.

While we're in the vicinity, delete some dead code in
create_merge_append_plan(): there's no need for it to support
parameterized MergeAppend paths, and it doesn't look like that
is going to change anytime soon.  It'll be easy enough to undo
this when/if it becomes useful.

Richard Guo

Discussion: https://postgr.es/m/CAMbWs4_ABSu4PWG2rE1q10tJugEXHWgru3U8dAgkoFvgrb6aEA@mail.gmail.com
This commit is contained in:
Tom Lane
2023-03-16 18:13:35 -04:00
parent 0dc40196f2
commit 9bfd2822b3
4 changed files with 44 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
src/backend/optimizer/plan/createplan.c
View File

@@ -1531,16 +1531,8 @@ create_merge_append_plan(PlannerInfo *root, MergeAppendPath *best_path,
prunequal = extract_actual_clauses(rel->baserestrictinfo, false);
if (best_path->path.param_info)
{
List *prmquals = best_path->path.param_info->ppi_clauses;
prmquals = extract_actual_clauses(prmquals, false);
prmquals = (List *) replace_nestloop_params(root,
(Node *) prmquals);
prunequal = list_concat(prunequal, prmquals);
}
/* We don't currently generate any parameterized MergeAppend paths */
Assert(best_path->path.param_info == NULL);
if (prunequal != NIL)
node->part_prune_index = make_partition_pruneinfo(root, rel,