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Move PartitionPruneInfo out of plan nodes into PlannedStmt

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This moves PartitionPruneInfo from plan nodes to PlannedStmt,
simplifying traversal by centralizing all PartitionPruneInfo
structures in a single list in it, which holds all instances for the
main query and its subqueries. Instead of plan nodes (Append or
MergeAppend) storing PartitionPruneInfo pointers, they now reference
an index in this list.

A bitmapset field is added to PartitionPruneInfo to store the RT
indexes corresponding to the apprelids field in Append or MergeAppend.
This allows execution pruning logic to verify that it operates on the
correct plan node, mainly to facilitate debugging.

Duplicated code in set_append_references() and
set_mergeappend_references() is refactored into a new function,
register_pruneinfo(). This updates RT indexes by applying rtoffet
and adds PartitionPruneInfo to the global list in PlannerGlobal.

By allowing pruning to be performed without traversing the plan tree,
this change lays the groundwork for runtime initial pruning to occur
independently of plan tree initialization.

Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org> (earlier version)
Reviewed-by: Robert Haas <robertmhaas@gmail.com>
Reviewed-by: Tomas Vondra <tomas@vondra.me>
Discussion: https://postgr.es/m/CA+HiwqFGkMSge6TgC9KQzde0ohpAycLQuV7ooitEEpbKB0O_mg@mail.gmail.com
This commit is contained in:
Amit Langote
2025-01-30 11:57:32 +09:00
parent ba0da16bd0
commit bb3ec16e14
15 changed files with 137 additions and 73 deletions
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103
src/backend/optimizer/plan/setrefs.c
View File

@@ -1731,6 +1731,53 @@ set_customscan_references(PlannerInfo *root,
cscan->custom_relids = offset_relid_set(cscan->custom_relids, rtoffset);
}
/*
* register_partpruneinfo
* Subroutine for set_append_references and set_mergeappend_references
*
* Add the PartitionPruneInfo from root->partPruneInfos at the given index
* into PlannerGlobal->partPruneInfos and return its index there.
*
* Also update the RT indexes present in PartitionedRelPruneInfos to add the
* offset.
*/
static int
register_partpruneinfo(PlannerInfo *root, int part_prune_index, int rtoffset)
{
PlannerGlobal *glob = root->glob;
PartitionPruneInfo *pinfo;
ListCell *l;
Assert(part_prune_index >= 0 &&
part_prune_index < list_length(root->partPruneInfos));
pinfo = list_nth_node(PartitionPruneInfo, root->partPruneInfos,
part_prune_index);
pinfo->relids = offset_relid_set(pinfo->relids, rtoffset);
foreach(l, pinfo->prune_infos)
{
List *prune_infos = lfirst(l);
ListCell *l2;
foreach(l2, prune_infos)
{
PartitionedRelPruneInfo *prelinfo = lfirst(l2);
prelinfo->rtindex += rtoffset;
prelinfo->initial_pruning_steps =
fix_scan_list(root, prelinfo->initial_pruning_steps,
rtoffset, 1);
prelinfo->exec_pruning_steps =
fix_scan_list(root, prelinfo->exec_pruning_steps,
rtoffset, 1);
}
}
glob->partPruneInfos = lappend(glob->partPruneInfos, pinfo);
return list_length(glob->partPruneInfos) - 1;
}
/*
* set_append_references
* Do set_plan_references processing on an Append
@@ -1783,27 +1830,13 @@ set_append_references(PlannerInfo *root,
aplan->apprelids = offset_relid_set(aplan->apprelids, rtoffset);
if (aplan->part_prune_info)
{
foreach(l, aplan->part_prune_info->prune_infos)
{
List *prune_infos = lfirst(l);
ListCell *l2;
foreach(l2, prune_infos)
{
PartitionedRelPruneInfo *pinfo = lfirst(l2);
pinfo->rtindex += rtoffset;
pinfo->initial_pruning_steps =
fix_scan_list(root, pinfo->initial_pruning_steps,
rtoffset, 1);
pinfo->exec_pruning_steps =
fix_scan_list(root, pinfo->exec_pruning_steps,
rtoffset, 1);
}
}
}
/*
* Add PartitionPruneInfo, if any, to PlannerGlobal and update the index.
* Also update the RT indexes present in it to add the offset.
*/
if (aplan->part_prune_index >= 0)
aplan->part_prune_index =
register_partpruneinfo(root, aplan->part_prune_index, rtoffset);
/* We don't need to recurse to lefttree or righttree ... */
Assert(aplan->plan.lefttree == NULL);
@@ -1865,27 +1898,13 @@ set_mergeappend_references(PlannerInfo *root,
mplan->apprelids = offset_relid_set(mplan->apprelids, rtoffset);
if (mplan->part_prune_info)
{
foreach(l, mplan->part_prune_info->prune_infos)
{
List *prune_infos = lfirst(l);
ListCell *l2;
foreach(l2, prune_infos)
{
PartitionedRelPruneInfo *pinfo = lfirst(l2);
pinfo->rtindex += rtoffset;
pinfo->initial_pruning_steps =
fix_scan_list(root, pinfo->initial_pruning_steps,
rtoffset, 1);
pinfo->exec_pruning_steps =
fix_scan_list(root, pinfo->exec_pruning_steps,
rtoffset, 1);
}
}
}
/*
* Add PartitionPruneInfo, if any, to PlannerGlobal and update the index.
* Also update the RT indexes present in it to add the offset.
*/
if (mplan->part_prune_index >= 0)
mplan->part_prune_index =
register_partpruneinfo(root, mplan->part_prune_index, rtoffset);
/* We don't need to recurse to lefttree or righttree ... */
Assert(mplan->plan.lefttree == NULL);