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Expand run-time partition pruning to work with MergeAppend

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This expands the support for the run-time partition pruning which was added
for Append in 499be013de to also allow unneeded subnodes of a MergeAppend
to be removed.

Author: David Rowley
Discussion: https://www.postgresql.org/message-id/CAKJS1f_F_V8D7Wu-HVdnH7zCUxhoGK8XhLLtd%3DCu85qDZzXrgg%40mail.gmail.com
This commit is contained in:
Heikki Linnakangas
2018-07-19 13:49:43 +03:00
parent b33ef397a1
commit 5220bb7533
11 changed files with 356 additions and 35 deletions
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46
src/backend/optimizer/plan/createplan.c
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@ -1068,6 +1068,11 @@ create_append_plan(PlannerInfo *root, AppendPath *best_path)
subplans = lappend(subplans, subplan);
}
/*
* If any quals exist, they may be useful to perform further partition
* pruning during execution. Gather information needed by the executor
* to do partition pruning.
*/
if (enable_partition_pruning &&
rel->reloptkind == RELOPT_BASEREL &&
best_path->partitioned_rels != NIL)
@ -1078,7 +1083,6 @@ create_append_plan(PlannerInfo *root, AppendPath *best_path)
if (best_path->path.param_info)
{
List *prmquals = best_path->path.param_info->ppi_clauses;
prmquals = extract_actual_clauses(prmquals, false);
@ -1088,12 +1092,6 @@ create_append_plan(PlannerInfo *root, AppendPath *best_path)
prunequal = list_concat(prunequal, prmquals);
}
/*
* If any quals exist, they may be useful to perform further partition
* pruning during execution. Generate a PartitionPruneInfo for each
* partitioned rel to store these quals and allow translation of
* partition indexes into subpath indexes.
*/
if (prunequal != NIL)
partpruneinfos =
make_partition_pruneinfo(root,
@ -1133,6 +1131,8 @@ create_merge_append_plan(PlannerInfo *root, MergeAppendPath *best_path)
List *pathkeys = best_path->path.pathkeys;
List *subplans = NIL;
ListCell *subpaths;
RelOptInfo *rel = best_path->path.parent;
List *partpruneinfos = NIL;
/*
* We don't have the actual creation of the MergeAppend node split out
@ -1218,8 +1218,40 @@ create_merge_append_plan(PlannerInfo *root, MergeAppendPath *best_path)
subplans = lappend(subplans, subplan);
}
/*
* If any quals exist, they may be useful to perform further partition
* pruning during execution. Gather information needed by the executor
* to do partition pruning.
*/
if (enable_partition_pruning &&
rel->reloptkind == RELOPT_BASEREL &&
best_path->partitioned_rels != NIL)
{
List *prunequal;
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);
}
if (prunequal != NIL)
partpruneinfos = make_partition_pruneinfo(root,
best_path->partitioned_rels,
best_path->subpaths, prunequal);
}
node->partitioned_rels = best_path->partitioned_rels;
node->mergeplans = subplans;
node->part_prune_infos = partpruneinfos;
return (Plan *) node;
}