Add toast tables to most system catalogs

It has been project policy to create toast tables only for those catalogs
that might reasonably need one.  Since this judgment call can change over
time, just create one for every catalog, as this can be useful when
creating rather-long entries in catalogs, with recent examples being in
the shape of policy expressions or customly-formatted SCRAM verifiers.

To prevent circular dependencies and to avoid adding complexity to VACUUM
FULL logic, exclude pg_class, pg_attribute, and pg_index.  Also, to
prevent pg_upgrade from seeing a non-empty new cluster, exclude
pg_largeobject and pg_largeobject_metadata from the set as large object
data is handled as user data.  Those relations have no reason to use a
toast table anyway.

Author: Joe Conway, John Naylor
Reviewed-by: Michael Paquier, Tom Lane
Discussion: https://postgr.es/m/84ddff04-f122-784b-b6c5-3536804495f8@joeconway.com

src/backend/catalog/catalog.c

@@ -253,12 +253,24 @@ IsSharedRelation(Oid relationId)
 		relationId == SubscriptionNameIndexId)
 		return true;
 	/* These are their toast tables and toast indexes (see toasting.h) */
-	if (relationId == PgShdescriptionToastTable ||
-		relationId == PgShdescriptionToastIndex ||
+	if (relationId == PgAuthidToastTable ||
+		relationId == PgAuthidToastIndex ||
+		relationId == PgDatabaseToastTable ||
+		relationId == PgDatabaseToastIndex ||
 		relationId == PgDbRoleSettingToastTable ||
 		relationId == PgDbRoleSettingToastIndex ||
+		relationId == PgPlTemplateToastTable ||
+		relationId == PgPlTemplateToastIndex ||
+		relationId == PgReplicationOriginToastTable ||
+		relationId == PgReplicationOriginToastIndex ||
+		relationId == PgShdescriptionToastTable ||
+		relationId == PgShdescriptionToastIndex ||
 		relationId == PgShseclabelToastTable ||
-		relationId == PgShseclabelToastIndex)
+		relationId == PgShseclabelToastIndex ||
+		relationId == PgSubscriptionToastTable ||
+		relationId == PgSubscriptionToastIndex ||
+		relationId == PgTablespaceToastTable ||
+		relationId == PgTablespaceToastIndex)
 		return true;
 	return false;
 }

src/include/catalog/toasting.h

@@ -46,25 +46,59 @@ extern void BootstrapToastTable(char *relName,
  */
 
 /* normal catalogs */
+DECLARE_TOAST(pg_aggregate, 4159, 4160);
 DECLARE_TOAST(pg_attrdef, 2830, 2831);
+DECLARE_TOAST(pg_collation, 4161, 4162);
 DECLARE_TOAST(pg_constraint, 2832, 2833);
+DECLARE_TOAST(pg_default_acl, 4143, 4144);
 DECLARE_TOAST(pg_description, 2834, 2835);
+DECLARE_TOAST(pg_event_trigger, 4145, 4146);
+DECLARE_TOAST(pg_extension, 4147, 4148);
+DECLARE_TOAST(pg_foreign_data_wrapper, 4149, 4150);
+DECLARE_TOAST(pg_foreign_server, 4151, 4152);
+DECLARE_TOAST(pg_foreign_table, 4153, 4154);
+DECLARE_TOAST(pg_init_privs, 4155, 4156);
+DECLARE_TOAST(pg_language, 4157, 4158);
+DECLARE_TOAST(pg_namespace, 4163, 4164);
+DECLARE_TOAST(pg_partitioned_table, 4165, 4166);
+DECLARE_TOAST(pg_policy, 4167, 4168);
 DECLARE_TOAST(pg_proc, 2836, 2837);
 DECLARE_TOAST(pg_rewrite, 2838, 2839);
 DECLARE_TOAST(pg_seclabel, 3598, 3599);
 DECLARE_TOAST(pg_statistic, 2840, 2841);
 DECLARE_TOAST(pg_statistic_ext, 3439, 3440);
 DECLARE_TOAST(pg_trigger, 2336, 2337);
+DECLARE_TOAST(pg_ts_dict, 4169, 4170);
+DECLARE_TOAST(pg_type, 4171, 4172);
+DECLARE_TOAST(pg_user_mapping, 4173, 4174);
 
 /* shared catalogs */
-DECLARE_TOAST(pg_shdescription, 2846, 2847);
-#define PgShdescriptionToastTable 2846
-#define PgShdescriptionToastIndex 2847
+DECLARE_TOAST(pg_authid, 4175, 4176);
+#define PgAuthidToastTable 4175
+#define PgAuthidToastIndex 4176
+DECLARE_TOAST(pg_database, 4177, 4178);
+#define PgDatabaseToastTable 4177
+#define PgDatabaseToastIndex 4178
 DECLARE_TOAST(pg_db_role_setting, 2966, 2967);
 #define PgDbRoleSettingToastTable 2966
 #define PgDbRoleSettingToastIndex 2967
+DECLARE_TOAST(pg_pltemplate, 4179, 4180);
+#define PgPlTemplateToastTable 4179
+#define PgPlTemplateToastIndex 4180
+DECLARE_TOAST(pg_replication_origin, 4181, 4182);
+#define PgReplicationOriginToastTable 4181
+#define PgReplicationOriginToastIndex 4182
+DECLARE_TOAST(pg_shdescription, 2846, 2847);
+#define PgShdescriptionToastTable 2846
+#define PgShdescriptionToastIndex 2847
 DECLARE_TOAST(pg_shseclabel, 4060, 4061);
 #define PgShseclabelToastTable 4060
 #define PgShseclabelToastIndex 4061
+DECLARE_TOAST(pg_subscription, 4183, 4184);
+#define PgSubscriptionToastTable 4183
+#define PgSubscriptionToastIndex 4184
+DECLARE_TOAST(pg_tablespace, 4185, 4186);
+#define PgTablespaceToastTable 4185
+#define PgTablespaceToastIndex 4186
 
 #endif							/* TOASTING_H */

src/test/regress/expected/misc_sanity.out

@@ -77,10 +77,14 @@ NOTICE:  pg_extension contains unpinned initdb-created object(s)
 NOTICE:  pg_rewrite contains unpinned initdb-created object(s)
 NOTICE:  pg_tablespace contains unpinned initdb-created object(s)
 -- **************** pg_class ****************
--- Look for system tables with varlena columns but no toast table.  At
--- the moment, the result just records the status quo so that changes
--- are deliberate.  Which system tables have toast tables is a bit
--- arbitrary at the moment.
+-- Look for system tables with varlena columns but no toast table. All
+-- system tables with toastable columns should have toast tables, with
+-- the following exceptions:
+-- 1. pg_class, pg_attribute, and pg_index, due to fear of recursive
+-- dependencies as toast tables depend on them.
+-- 2. pg_largeobject and pg_largeobject_metadata.  Large object catalogs
+-- and toast tables are mutually exclusive and large object data is handled
+-- as user data by pg_upgrade, which would cause failures.
 SELECT relname, attname, atttypid::regtype
 FROM pg_class c JOIN pg_attribute a ON c.oid = attrelid
 WHERE c.oid < 16384 AND
@@ -88,58 +92,18 @@ WHERE c.oid < 16384 AND
       relkind = 'r' AND
       attstorage != 'p'
 ORDER BY 1, 2;
-         relname         |     attname     |   atttypid   
--------------------------+-----------------+--------------
- pg_aggregate            | agginitval      | text
- pg_aggregate            | aggminitval     | text
- pg_attribute            | attacl          | aclitem[]
- pg_attribute            | attfdwoptions   | text[]
- pg_attribute            | attmissingval   | anyarray
- pg_attribute            | attoptions      | text[]
- pg_authid               | rolpassword     | text
- pg_class                | relacl          | aclitem[]
- pg_class                | reloptions      | text[]
- pg_class                | relpartbound    | pg_node_tree
- pg_collation            | collversion     | text
- pg_database             | datacl          | aclitem[]
- pg_default_acl          | defaclacl       | aclitem[]
- pg_event_trigger        | evttags         | text[]
- pg_extension            | extcondition    | text[]
- pg_extension            | extconfig       | oid[]
- pg_extension            | extversion      | text
- pg_foreign_data_wrapper | fdwacl          | aclitem[]
- pg_foreign_data_wrapper | fdwoptions      | text[]
- pg_foreign_server       | srvacl          | aclitem[]
- pg_foreign_server       | srvoptions      | text[]
- pg_foreign_server       | srvtype         | text
- pg_foreign_server       | srvversion      | text
- pg_foreign_table        | ftoptions       | text[]
- pg_index                | indexprs        | pg_node_tree
- pg_index                | indpred         | pg_node_tree
- pg_init_privs           | initprivs       | aclitem[]
- pg_language             | lanacl          | aclitem[]
- pg_largeobject          | data            | bytea
- pg_largeobject_metadata | lomacl          | aclitem[]
- pg_namespace            | nspacl          | aclitem[]
- pg_partitioned_table    | partexprs       | pg_node_tree
- pg_pltemplate           | tmplacl         | aclitem[]
- pg_pltemplate           | tmplhandler     | text
- pg_pltemplate           | tmplinline      | text
- pg_pltemplate           | tmpllibrary     | text
- pg_pltemplate           | tmplvalidator   | text
- pg_policy               | polqual         | pg_node_tree
- pg_policy               | polroles        | oid[]
- pg_policy               | polwithcheck    | pg_node_tree
- pg_replication_origin   | roname          | text
- pg_subscription         | subconninfo     | text
- pg_subscription         | subpublications | text[]
- pg_subscription         | subsynccommit   | text
- pg_tablespace           | spcacl          | aclitem[]
- pg_tablespace           | spcoptions      | text[]
- pg_ts_dict              | dictinitoption  | text
- pg_type                 | typacl          | aclitem[]
- pg_type                 | typdefault      | text
- pg_type                 | typdefaultbin   | pg_node_tree
- pg_user_mapping         | umoptions       | text[]
-(51 rows)
+         relname         |    attname    |   atttypid   
+-------------------------+---------------+--------------
+ pg_attribute            | attacl        | aclitem[]
+ pg_attribute            | attfdwoptions | text[]
+ pg_attribute            | attmissingval | anyarray
+ pg_attribute            | attoptions    | text[]
+ pg_class                | relacl        | aclitem[]
+ pg_class                | reloptions    | text[]
+ pg_class                | relpartbound  | pg_node_tree
+ pg_index                | indexprs      | pg_node_tree
+ pg_index                | indpred       | pg_node_tree
+ pg_largeobject          | data          | bytea
+ pg_largeobject_metadata | lomacl        | aclitem[]
+(11 rows)
 

src/test/regress/sql/misc_sanity.sql

@@ -75,10 +75,14 @@ end$$;
 
 -- **************** pg_class ****************
 
--- Look for system tables with varlena columns but no toast table.  At
--- the moment, the result just records the status quo so that changes
--- are deliberate.  Which system tables have toast tables is a bit
--- arbitrary at the moment.
+-- Look for system tables with varlena columns but no toast table. All
+-- system tables with toastable columns should have toast tables, with
+-- the following exceptions:
+-- 1. pg_class, pg_attribute, and pg_index, due to fear of recursive
+-- dependencies as toast tables depend on them.
+-- 2. pg_largeobject and pg_largeobject_metadata.  Large object catalogs
+-- and toast tables are mutually exclusive and large object data is handled
+-- as user data by pg_upgrade, which would cause failures.
 
 SELECT relname, attname, atttypid::regtype
 FROM pg_class c JOIN pg_attribute a ON c.oid = attrelid