Invalidate relcache for publications defined for all tables.

Updates/Deletes on a relation were allowed even without replica identity
after we define the publication for all tables. This would later lead to
an error on subscribers. The reason was that for such publications we were
not invalidating the relcache and the publication information for
relations was not getting rebuilt. Similarly, we were not invalidating the
relcache after dropping of such publications which will prohibit
Updates/Deletes without replica identity even without any publication.

Author: Vignesh C and Hou Zhijie
Reviewed-by: Hou Zhijie, Kyotaro Horiguchi, Amit Kapila
Backpatch-through: 10, where it was introduced
Discussion: https://postgr.es/m/CALDaNm0pF6zeWqCA8TCe2sDuwFAy8fCqba=nHampCKag-qLixg@mail.gmail.com

Author: Amit Kapila

src/backend/catalog/dependency.c

@@ -1460,6 +1460,10 @@ doDeletion(const ObjectAddress *object, int flags)
 			RemovePublicationRelById(object->objectId);
 			break;
 
+		case OCLASS_PUBLICATION:
+			RemovePublicationById(object->objectId);
+			break;
+
 		case OCLASS_CAST:
 		case OCLASS_COLLATION:
 		case OCLASS_CONVERSION:
@@ -1478,7 +1482,6 @@ doDeletion(const ObjectAddress *object, int flags)
 		case OCLASS_USER_MAPPING:
 		case OCLASS_DEFACL:
 		case OCLASS_EVENT_TRIGGER:
-		case OCLASS_PUBLICATION:
 		case OCLASS_TRANSFORM:
 			DropObjectById(object);
 			break;

src/backend/commands/publicationcmds.c

@@ -234,6 +234,11 @@ CreatePublication(ParseState *pstate, CreatePublicationStmt *stmt)
 		PublicationAddTables(puboid, rels, true, NULL);
 		CloseTableList(rels);
 	}
+	else if (stmt->for_all_tables)
+	{
+		/* Invalidate relcache so that publication info is rebuilt. */
+		CacheInvalidateRelcacheAll();
+	}
 
 	table_close(rel, RowExclusiveLock);
 
@@ -504,6 +509,35 @@ RemovePublicationRelById(Oid proid)
 	table_close(rel, RowExclusiveLock);
 }
 
+/*
+ * Remove the publication by mapping OID.
+ */
+void
+RemovePublicationById(Oid pubid)
+{
+	Relation	rel;
+	HeapTuple	tup;
+	Form_pg_publication pubform;
+
+	rel = table_open(PublicationRelationId, RowExclusiveLock);
+
+	tup = SearchSysCache1(PUBLICATIONOID, ObjectIdGetDatum(pubid));
+	if (!HeapTupleIsValid(tup))
+		elog(ERROR, "cache lookup failed for publication %u", pubid);
+
+	pubform = (Form_pg_publication)GETSTRUCT(tup);
+
+	/* Invalidate relcache so that publication info is rebuilt. */
+	if (pubform->puballtables)
+		CacheInvalidateRelcacheAll();
+
+	CatalogTupleDelete(rel, &tup->t_self);
+
+	ReleaseSysCache(tup);
+
+	table_close(rel, RowExclusiveLock);
+}
+
 /*
  * Open relations specified by a PublicationTable list.
  * In the returned list of PublicationRelInfo, tables are locked

src/include/commands/publicationcmds.h

@@ -20,6 +20,7 @@
 
 extern ObjectAddress CreatePublication(ParseState *pstate, CreatePublicationStmt *stmt);
 extern void AlterPublication(ParseState *pstate, AlterPublicationStmt *stmt);
+extern void RemovePublicationById(Oid pubid);
 extern void RemovePublicationRelById(Oid proid);
 
 extern ObjectAddress AlterPublicationOwner(const char *name, Oid newOwnerId);

src/test/regress/expected/publication.out

@@ -158,6 +158,21 @@ Tables:
 
 DROP TABLE testpub_parted1;
 DROP PUBLICATION testpub_forparted, testpub_forparted1;
+-- Test cache invalidation FOR ALL TABLES publication
+SET client_min_messages = 'ERROR';
+CREATE TABLE testpub_tbl4(a int);
+INSERT INTO testpub_tbl4 values(1);
+UPDATE testpub_tbl4 set a = 2;
+CREATE PUBLICATION testpub_foralltables FOR ALL TABLES;
+RESET client_min_messages;
+-- fail missing REPLICA IDENTITY
+UPDATE testpub_tbl4 set a = 3;
+ERROR:  cannot update table "testpub_tbl4" because it does not have a replica identity and publishes updates
+HINT:  To enable updating the table, set REPLICA IDENTITY using ALTER TABLE.
+DROP PUBLICATION testpub_foralltables;
+-- should pass after dropping the publication
+UPDATE testpub_tbl4 set a = 3;
+DROP TABLE testpub_tbl4;
 -- fail - view
 CREATE PUBLICATION testpub_fortbl FOR TABLE testpub_view;
 ERROR:  cannot add relation "testpub_view" to publication

src/test/regress/sql/publication.sql

@@ -93,6 +93,20 @@ ALTER PUBLICATION testpub_forparted SET (publish_via_partition_root = true);
 DROP TABLE testpub_parted1;
 DROP PUBLICATION testpub_forparted, testpub_forparted1;
 
+-- Test cache invalidation FOR ALL TABLES publication
+SET client_min_messages = 'ERROR';
+CREATE TABLE testpub_tbl4(a int);
+INSERT INTO testpub_tbl4 values(1);
+UPDATE testpub_tbl4 set a = 2;
+CREATE PUBLICATION testpub_foralltables FOR ALL TABLES;
+RESET client_min_messages;
+-- fail missing REPLICA IDENTITY
+UPDATE testpub_tbl4 set a = 3;
+DROP PUBLICATION testpub_foralltables;
+-- should pass after dropping the publication
+UPDATE testpub_tbl4 set a = 3;
+DROP TABLE testpub_tbl4;
+
 -- fail - view
 CREATE PUBLICATION testpub_fortbl FOR TABLE testpub_view;
 SET client_min_messages = 'ERROR';