[AQUMV] Store view query in gp_matview_aux for view matching.

Move materialized views SQLs for AQUMV from pg_rewrite to
gp_matview_aux. This would allow for quicker access and
filtering, bypassing the evaluation of the system's 200
built-in rule entries that are often irrelevant.

before this commit:

set enable_answer_query_using_materialized_views = off;
explain(analyze, costs off, verbose) select count(a) from
t_select;
                          QUERY PLAN
------------------------------------------------------------------
 Finalize Aggregate (actual time=0.000..0.000 rows=1 loops=1)
   Output: count(a)
   ->  Gather Motion 3:1  (slice1; segments: 3) (actual
time=0.000..0.000 rows=3 loops=1)
         Output: (PARTIAL count(a))
         ->  Partial Aggregate (actual time=0.000..0.000 rows=1 loops=1)
               Output: PARTIAL count(a)
               ->  Seq Scan on public.t_select (actual time=0.000..0.000
rows=340 loops=1)
                     Output: a
 Settings: enable_answer_query_using_materialized_views = 'off',
optimizer = 'off'
 Planning Time: 0.462 ms
   (slice0)    Executor memory: 114K bytes.
   (slice1)    Executor memory: 112K bytes avg x 3x(0) workers, 112K
bytes max (seg0).
 Memory used:  128000kB
 Optimizer: Postgres query optimizer
 Execution Time: 1.898 ms
(15 rows)

enable_answer_query_using_materialized_views = off
Planning Time: 0.462 ms

after this commit:
explain(analyze, costs off, verbose) select count(a) from
t_select;
                             QUERY PLAN
-----------------------------------------------------------------------
 Finalize Aggregate (actual time=4.000..4.000 rows=1 loops=1)
   Output: count(a)
   ->  Gather Motion 3:1  (slice1; segments: 3) (actual
time=4.000..4.000 rows=3 loops=1)
         Output: (PARTIAL count(a))
         ->  Partial Aggregate (actual time=4.000..4.000 rows=1 loops=1)
               Output: PARTIAL count(a)
               ->  Seq Scan on public.t_select (actual time=4.000..4.000
rows=0 loops=1)
                     Output: a
 Settings: enable_answer_query_using_materialized_views = 'on',
optimizer = 'off'
 Planning Time: 0.623 ms
   (slice0)    Executor memory: 114K bytes.
   (slice1)    Executor memory: 112K bytes avg x 3x(0) workers, 112K
bytes max (seg0).
 Memory used:  128000kB
 Optimizer: Postgres query optimizer
 Execution Time: 1.670 ms
(15 rows)

enable_answer_query_using_materialized_views = off
Planning Time: 0.623 ms

Authored-by: Zhang Mingli avamingli@gmail.com

Author: avamingli

contrib/pax_storage/src/test/regress/expected/misc_sanity.out

@@ -104,6 +104,7 @@ ORDER BY 1, 2;
          relname          |      attname       |   atttypid   
 --------------------------+--------------------+--------------
  gp_configuration_history | desc               | text
+ gp_matview_aux           | view_query         | pg_node_tree
  gp_version_at_initdb     | productversion     | text
  gp_warehouse             | warehouse_name     | text
  pg_attribute             | attacl             | aclitem[]
@@ -137,7 +138,7 @@ ORDER BY 1, 2;
  pg_task_run_history      | return_message     | text
  pg_task_run_history      | status             | text
  pg_task_run_history      | username           | text
-(34 rows)
+(35 rows)
 
 -- start_ignore
 -- system catalogs without primary keys

src/backend/catalog/gp_matview_aux.c

@@ -41,6 +41,7 @@
 #include "catalog/pg_type.h"
 #include "catalog/indexing.h"
 #include "cdb/cdbvars.h"
+#include "commands/matview.h"
 #include "utils/array.h"
 #include "utils/builtins.h"
 #include "utils/rel.h"
@@ -153,7 +154,6 @@ add_view_dependency(Oid mvoid)
 	recordDependencyOn(&myself, &referenced, DEPENDENCY_AUTO);
 }
 
-
 /*
  * InsertMatviewAuxEntry
  *  We also insert gp_matview_tables entry here to maintain view.
@@ -168,6 +168,8 @@ InsertMatviewAuxEntry(Oid mvoid, const Query *viewQuery, bool skipdata)
 	List 		*relids;
 	NameData	mvname;
 	bool		has_foreign = false;
+	Relation		matviewRel;
+	char	   *viewsql;
 
 	Assert(OidIsValid(mvoid));
 
@@ -187,7 +189,12 @@ InsertMatviewAuxEntry(Oid mvoid, const Query *viewQuery, bool skipdata)
 	values[Anum_gp_matview_aux_mvname - 1] = NameGetDatum(&mvname);
 
 	values[Anum_gp_matview_aux_has_foreign - 1] = BoolGetDatum(has_foreign);
-	
+
+	matviewRel = table_open(mvoid, NoLock);
+	viewsql = nodeToString((Node *) copyObject(get_matview_query(matviewRel)));
+	table_close(matviewRel, NoLock);
+	values[Anum_gp_matview_aux_view_query - 1] = CStringGetTextDatum(viewsql);
+
 	if (skipdata)
 		values[Anum_gp_matview_aux_datastatus - 1] = CharGetDatum(MV_DATA_STATUS_EXPIRED);
 	else

src/backend/optimizer/plan/aqumv.c

@@ -147,11 +147,12 @@ answer_query_using_materialized_views(PlannerInfo *root, AqumvContext aqumv_cont
 	RangeTblEntry 	*rte;
 	Oid				origin_rel_oid;
 	RangeTblEntry 	*mvrte;
-	Relation		ruleDesc;
 	Relation		matviewRel;
-	SysScanDesc		rcscan;
+	Relation		mvauxDesc;
+	TupleDesc		mvaux_tupdesc;
+	SysScanDesc		mvscan;
 	HeapTuple		tup;
-	Form_pg_rewrite	rewrite_tup;
+	Form_gp_matview_aux mvaux_tup;
 	bool			need_close = false;
 	PlannerInfo		*subroot;
 	List			*mv_final_tlist = NIL; /* Final target list we want to rewrite to. */
@@ -217,20 +218,24 @@ answer_query_using_materialized_views(PlannerInfo *root, AqumvContext aqumv_cont
 	if (relkind == RELKIND_FOREIGN_TABLE && !aqumv_allow_foreign_table)
 		return mv_final_rel;
 
-	ruleDesc = table_open(RewriteRelationId, AccessShareLock);
+	mvauxDesc = table_open(GpMatviewAuxId, AccessShareLock);
+	mvaux_tupdesc = RelationGetDescr(mvauxDesc);
 
-	rcscan = systable_beginscan(ruleDesc, InvalidOid, false,
+	mvscan = systable_beginscan(mvauxDesc, InvalidOid, false,
 								NULL, 0, NULL);
 
-	while (HeapTupleIsValid(tup = systable_getnext(rcscan)))
+	while (HeapTupleIsValid(tup = systable_getnext(mvscan)))
 	{
+		Datum		view_query_datum;
+		char		*view_query_str;
+		bool		is_null;
+
 		CHECK_FOR_INTERRUPTS();
 		if (need_close)
 			table_close(matviewRel, AccessShareLock);
 
-		rewrite_tup = (Form_pg_rewrite) GETSTRUCT(tup);
-
-		matviewRel = table_open(rewrite_tup->ev_class, AccessShareLock);
+		mvaux_tup = (Form_gp_matview_aux) GETSTRUCT(tup);
+		matviewRel = table_open(mvaux_tup->mvoid, AccessShareLock);
 		need_close = true;
 
 		if (!RelationIsPopulated(matviewRel))
@@ -251,7 +256,14 @@ answer_query_using_materialized_views(PlannerInfo *root, AqumvContext aqumv_cont
 		/*
 		 * Get a copy of view query to rewrite.
 		 */
-		viewQuery = copyObject(get_matview_query(matviewRel));
+		view_query_datum = heap_getattr(tup,
+										Anum_gp_matview_aux_view_query,
+										mvaux_tupdesc,
+										&is_null);
+
+		view_query_str = TextDatumGetCString(view_query_datum);
+		viewQuery = copyObject(stringToNode(view_query_str));
+		pfree(view_query_str);
 		Assert(IsA(viewQuery, Query));
 
 		/*
@@ -620,8 +632,8 @@ answer_query_using_materialized_views(PlannerInfo *root, AqumvContext aqumv_cont
 	}
 	if (need_close)
 		table_close(matviewRel, AccessShareLock);
-	systable_endscan(rcscan);
-	table_close(ruleDesc, AccessShareLock);
+	systable_endscan(mvscan);
+	table_close(mvauxDesc, AccessShareLock);
 
 	return current_rel;
 }

src/include/catalog/gp_matview_aux.h

@@ -44,6 +44,10 @@ CATALOG(gp_matview_aux,7153,GpMatviewAuxId)
 	bool		has_foreign;	/* view query has foreign tables? */
 	/* view's data status */
 	char		datastatus; 
+
+#ifdef CATALOG_VARLEN			/* variable-length fields start here */
+	pg_node_tree view_query BKI_FORCE_NOT_NULL;
+#endif
 } FormData_gp_matview_aux;
 
 

src/test/regress/expected/misc_sanity.out

@@ -104,6 +104,7 @@ ORDER BY 1, 2;
          relname          |      attname       |   atttypid   
 --------------------------+--------------------+--------------
  gp_configuration_history | desc               | text
+ gp_matview_aux           | view_query         | pg_node_tree
  gp_version_at_initdb     | productversion     | text
  gp_warehouse             | warehouse_name     | text
  pg_attribute             | attacl             | aclitem[]
@@ -137,7 +138,7 @@ ORDER BY 1, 2;
  pg_task_run_history      | return_message     | text
  pg_task_run_history      | status             | text
  pg_task_run_history      | username           | text
-(34 rows)
+(35 rows)
 
 -- system catalogs without primary keys
 --

src/test/singlenode_regress/expected/misc_sanity.out

@@ -104,6 +104,7 @@ ORDER BY 1, 2;
          relname          |      attname       |   atttypid   
 --------------------------+--------------------+--------------
  gp_configuration_history | desc               | text
+ gp_matview_aux           | view_query         | pg_node_tree
  gp_version_at_initdb     | productversion     | text
  gp_warehouse             | warehouse_name     | text
  pg_attribute             | attacl             | aclitem[]
@@ -137,7 +138,7 @@ ORDER BY 1, 2;
  pg_task_run_history      | return_message     | text
  pg_task_run_history      | status             | text
  pg_task_run_history      | username           | text
-(34 rows)
+(35 rows)
 
 -- system catalogs without primary keys
 --