Revert "Move PartitionPruneInfo out of plan nodes into PlannedStmt"

This reverts commit ec38694 and its fixup 589bb81.

This change was intended to support query planning avoiding acquisition
of locks on partitions that were going to be pruned; however, the
overall project took a different direction at [1] and this bit is no
longer needed.  Put things back the way they were as agreed in [2], to
avoid unnecessary complexity.

Discussion: [1] https://postgr.es/m/4191508.1674157166@sss.pgh.pa.us
Discussion: [2] https://postgr.es/m/20230502175409.kcoirxczpdha26wt@alvherre.pgsql

Author: alvherre

src/backend/executor/execMain.c

@@ -824,7 +824,6 @@ InitPlan(QueryDesc *queryDesc, int eflags)
 	ExecInitRangeTable(estate, rangeTable, plannedstmt->permInfos);
 
 	estate->es_plannedstmt = plannedstmt;
-	estate->es_part_prune_infos = plannedstmt->partPruneInfos;
 
 	/*
 	 * Next, build the ExecRowMark array from the PlanRowMark(s), if any.

src/backend/executor/execParallel.c

@@ -183,7 +183,6 @@ ExecSerializePlan(Plan *plan, EState *estate)
 	pstmt->dependsOnRole = false;
 	pstmt->parallelModeNeeded = false;
 	pstmt->planTree = plan;
-	pstmt->partPruneInfos = estate->es_part_prune_infos;
 	pstmt->rtable = estate->es_range_table;
 	pstmt->permInfos = estate->es_rteperminfos;
 	pstmt->resultRelations = NIL;

src/backend/executor/execPartition.c

@@ -1778,9 +1778,6 @@ adjust_partition_colnos_using_map(List *colnos, AttrMap *attrMap)
  *		Initialize data structure needed for run-time partition pruning and
  *		do initial pruning if needed
  *
- * 'root_parent_relids' identifies the relation to which both the parent plan
- * and the PartitionPruneInfo given by 'part_prune_index' belong.
- *
  * On return, *initially_valid_subplans is assigned the set of indexes of
  * child subplans that must be initialized along with the parent plan node.
  * Initial pruning is performed here if needed and in that case only the
@@ -1793,24 +1790,11 @@ adjust_partition_colnos_using_map(List *colnos, AttrMap *attrMap)
 PartitionPruneState *
 ExecInitPartitionPruning(PlanState *planstate,
 						 int n_total_subplans,
-						 int part_prune_index,
-						 Bitmapset *root_parent_relids,
+						 PartitionPruneInfo *pruneinfo,
 						 Bitmapset **initially_valid_subplans)
 {
 	PartitionPruneState *prunestate;
 	EState	   *estate = planstate->state;
-	PartitionPruneInfo *pruneinfo;
-
-	/* Obtain the pruneinfo we need, and make sure it's the right one */
-	pruneinfo = list_nth(estate->es_part_prune_infos, part_prune_index);
-	if (!bms_equal(root_parent_relids, pruneinfo->root_parent_relids))
-		ereport(ERROR,
-				errcode(ERRCODE_INTERNAL_ERROR),
-				errmsg_internal("mismatching PartitionPruneInfo found at part_prune_index %d",
-								part_prune_index),
-				errdetail_internal("plan node relids %s, pruneinfo relids %s",
-								   bmsToString(root_parent_relids),
-								   bmsToString(pruneinfo->root_parent_relids)));
 
 	/* We may need an expression context to evaluate partition exprs */
 	ExecAssignExprContext(estate, planstate);

src/backend/executor/execUtils.c

@@ -123,7 +123,6 @@ CreateExecutorState(void)
 	estate->es_rowmarks = NULL;
 	estate->es_rteperminfos = NIL;
 	estate->es_plannedstmt = NULL;
-	estate->es_part_prune_infos = NIL;
 
 	estate->es_junkFilter = NULL;
 

src/backend/executor/nodeAppend.c

@@ -134,7 +134,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 	appendstate->as_begun = false;
 
 	/* If run-time partition pruning is enabled, then set that up now */
-	if (node->part_prune_index >= 0)
+	if (node->part_prune_info != NULL)
 	{
 		PartitionPruneState *prunestate;
 
@@ -145,8 +145,7 @@ ExecInitAppend(Append *node, EState *estate, int eflags)
 		 */
 		prunestate = ExecInitPartitionPruning(&appendstate->ps,
 											  list_length(node->appendplans),
-											  node->part_prune_index,
-											  node->apprelids,
+											  node->part_prune_info,
 											  &validsubplans);
 		appendstate->as_prune_state = prunestate;
 		nplans = bms_num_members(validsubplans);

src/backend/executor/nodeMergeAppend.c

@@ -82,7 +82,7 @@ ExecInitMergeAppend(MergeAppend *node, EState *estate, int eflags)
 	mergestate->ps.ExecProcNode = ExecMergeAppend;
 
 	/* If run-time partition pruning is enabled, then set that up now */
-	if (node->part_prune_index >= 0)
+	if (node->part_prune_info != NULL)
 	{
 		PartitionPruneState *prunestate;
 
@@ -93,8 +93,7 @@ ExecInitMergeAppend(MergeAppend *node, EState *estate, int eflags)
 		 */
 		prunestate = ExecInitPartitionPruning(&mergestate->ps,
 											  list_length(node->mergeplans),
-											  node->part_prune_index,
-											  node->apprelids,
+											  node->part_prune_info,
 											  &validsubplans);
 		mergestate->ms_prune_state = prunestate;
 		nplans = bms_num_members(validsubplans);

src/backend/optimizer/plan/createplan.c

@@ -1203,6 +1203,7 @@ create_append_plan(PlannerInfo *root, AppendPath *best_path, int flags)
 	ListCell   *subpaths;
 	int			nasyncplans = 0;
 	RelOptInfo *rel = best_path->path.parent;
+	PartitionPruneInfo *partpruneinfo = NULL;
 	int			nodenumsortkeys = 0;
 	AttrNumber *nodeSortColIdx = NULL;
 	Oid		   *nodeSortOperators = NULL;
@@ -1353,9 +1354,6 @@ create_append_plan(PlannerInfo *root, AppendPath *best_path, int flags)
 		subplans = lappend(subplans, subplan);
 	}
 
-	/* Set below if we find quals that we can use to run-time prune */
-	plan->part_prune_index = -1;
-
 	/*
 	 * If any quals exist, they may be useful to perform further partition
 	 * pruning during execution.  Gather information needed by the executor to
@@ -1379,14 +1377,16 @@ create_append_plan(PlannerInfo *root, AppendPath *best_path, int flags)
 		}
 
 		if (prunequal != NIL)
-			plan->part_prune_index = make_partition_pruneinfo(root, rel,
-															  best_path->subpaths,
-															  prunequal);
+			partpruneinfo =
+				make_partition_pruneinfo(root, rel,
+										 best_path->subpaths,
+										 prunequal);
 	}
 
 	plan->appendplans = subplans;
 	plan->nasyncplans = nasyncplans;
 	plan->first_partial_plan = best_path->first_partial_path;
+	plan->part_prune_info = partpruneinfo;
 
 	copy_generic_path_info(&plan->plan, (Path *) best_path);
 
@@ -1425,6 +1425,7 @@ create_merge_append_plan(PlannerInfo *root, MergeAppendPath *best_path,
 	List	   *subplans = NIL;
 	ListCell   *subpaths;
 	RelOptInfo *rel = best_path->path.parent;
+	PartitionPruneInfo *partpruneinfo = NULL;
 
 	/*
 	 * We don't have the actual creation of the MergeAppend node split out
@@ -1517,9 +1518,6 @@ create_merge_append_plan(PlannerInfo *root, MergeAppendPath *best_path,
 		subplans = lappend(subplans, subplan);
 	}
 
-	/* Set below if we find quals that we can use to run-time prune */
-	node->part_prune_index = -1;
-
 	/*
 	 * If any quals exist, they may be useful to perform further partition
 	 * pruning during execution.  Gather information needed by the executor to
@@ -1535,13 +1533,13 @@ create_merge_append_plan(PlannerInfo *root, MergeAppendPath *best_path,
 		Assert(best_path->path.param_info == NULL);
 
 		if (prunequal != NIL)
-			node->part_prune_index = make_partition_pruneinfo(root, rel,
-															  best_path->subpaths,
-															  prunequal);
+			partpruneinfo = make_partition_pruneinfo(root, rel,
+													 best_path->subpaths,
+													 prunequal);
 	}
 
 	node->mergeplans = subplans;
-
+	node->part_prune_info = partpruneinfo;
 
 	/*
 	 * If prepare_sort_from_pathkeys added sort columns, but we were told to

src/backend/optimizer/plan/planner.c

@@ -522,7 +522,6 @@ standard_planner(Query *parse, const char *query_string, int cursorOptions,
 	result->dependsOnRole = glob->dependsOnRole;
 	result->parallelModeNeeded = glob->parallelModeNeeded;
 	result->planTree = top_plan;
-	result->partPruneInfos = glob->partPruneInfos;
 	result->rtable = glob->finalrtable;
 	result->permInfos = glob->finalrteperminfos;
 	result->resultRelations = glob->resultRelations;

src/backend/optimizer/plan/setrefs.c

@@ -350,29 +350,6 @@ set_plan_references(PlannerInfo *root, Plan *plan)
 			palloc0(list_length(glob->subplans) * sizeof(bool));
 	}
 
-	/* Also fix up the information in PartitionPruneInfos. */
-	foreach(lc, root->partPruneInfos)
-	{
-		PartitionPruneInfo *pruneinfo = lfirst(lc);
-		ListCell   *l;
-
-		pruneinfo->root_parent_relids =
-			offset_relid_set(pruneinfo->root_parent_relids, rtoffset);
-		foreach(l, pruneinfo->prune_infos)
-		{
-			List	   *prune_infos = lfirst(l);
-			ListCell   *l2;
-
-			foreach(l2, prune_infos)
-			{
-				PartitionedRelPruneInfo *pinfo = lfirst(l2);
-
-				/* RT index of the table to which the pinfo belongs. */
-				pinfo->rtindex += rtoffset;
-			}
-		}
-	}
-
 	/* Now fix the Plan tree */
 	result = set_plan_refs(root, plan, rtoffset);
 
@@ -1728,29 +1705,6 @@ 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.
- */
-static int
-register_partpruneinfo(PlannerInfo *root, int part_prune_index)
-{
-	PlannerGlobal  *glob = root->glob;
-	PartitionPruneInfo *pruneinfo;
-
-	Assert(part_prune_index >= 0 &&
-		   part_prune_index < list_length(root->partPruneInfos));
-	pruneinfo = list_nth_node(PartitionPruneInfo, root->partPruneInfos,
-							  part_prune_index);
-
-	glob->partPruneInfos = lappend(glob->partPruneInfos, pruneinfo);
-
-	return list_length(glob->partPruneInfos) - 1;
-}
-
 /*
  * set_append_references
  *		Do set_plan_references processing on an Append
@@ -1803,12 +1757,21 @@ set_append_references(PlannerInfo *root,
 
 	aplan->apprelids = offset_relid_set(aplan->apprelids, rtoffset);
 
-	/*
-	 * Add PartitionPruneInfo, if any, to PlannerGlobal and update the index.
-	 */
-	if (aplan->part_prune_index >= 0)
-		aplan->part_prune_index =
-			register_partpruneinfo(root, aplan->part_prune_index);
+	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;
+			}
+		}
+	}
 
 	/* We don't need to recurse to lefttree or righttree ... */
 	Assert(aplan->plan.lefttree == NULL);
@@ -1870,12 +1833,21 @@ set_mergeappend_references(PlannerInfo *root,
 
 	mplan->apprelids = offset_relid_set(mplan->apprelids, rtoffset);
 
-	/*
-	 * Add PartitionPruneInfo, if any, to PlannerGlobal and update the index.
-	 */
-	if (mplan->part_prune_index >= 0)
-		mplan->part_prune_index =
-			register_partpruneinfo(root, mplan->part_prune_index);
+	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;
+			}
+		}
+	}
 
 	/* We don't need to recurse to lefttree or righttree ... */
 	Assert(mplan->plan.lefttree == NULL);

src/backend/partitioning/partprune.c

@@ -210,20 +210,16 @@ static void partkey_datum_from_expr(PartitionPruneContext *context,
 
 /*
  * make_partition_pruneinfo
- *		Checks if the given set of quals can be used to build pruning steps
- *		that the executor can use to prune away unneeded partitions.  If
- *		suitable quals are found then a PartitionPruneInfo is built and tagged
- *		onto the PlannerInfo's partPruneInfos list.
- *
- * The return value is the 0-based index of the item added to the
- * partPruneInfos list or -1 if nothing was added.
+ *		Builds a PartitionPruneInfo which can be used in the executor to allow
+ *		additional partition pruning to take place.  Returns NULL when
+ *		partition pruning would be useless.
  *
  * 'parentrel' is the RelOptInfo for an appendrel, and 'subpaths' is the list
  * of scan paths for its child rels.
  * 'prunequal' is a list of potential pruning quals (i.e., restriction
  * clauses that are applicable to the appendrel).
  */
-int
+PartitionPruneInfo *
 make_partition_pruneinfo(PlannerInfo *root, RelOptInfo *parentrel,
 						 List *subpaths,
 						 List *prunequal)
@@ -337,11 +333,10 @@ make_partition_pruneinfo(PlannerInfo *root, RelOptInfo *parentrel,
 	 * quals, then we can just not bother with run-time pruning.
 	 */
 	if (prunerelinfos == NIL)
-		return -1;
+		return NULL;
 
 	/* Else build the result data structure */
 	pruneinfo = makeNode(PartitionPruneInfo);
-	pruneinfo->root_parent_relids = parentrel->relids;
 	pruneinfo->prune_infos = prunerelinfos;
 
 	/*
@@ -364,9 +359,7 @@ make_partition_pruneinfo(PlannerInfo *root, RelOptInfo *parentrel,
 	else
 		pruneinfo->other_subplans = NULL;
 
-	root->partPruneInfos = lappend(root->partPruneInfos, pruneinfo);
-
-	return list_length(root->partPruneInfos) - 1;
+	return pruneinfo;
 }
 
 /*