Disable nonmaindb interface

src/backend/distributed/shared_library_init.c

@@ -1834,16 +1834,6 @@ RegisterCitusConfigVariables(void)
 		GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE | GUC_UNIT_MS,
 		NULL, NULL, NULL);
 
-	DefineCustomStringVariable(
-		"citus.main_db",
-		gettext_noop("Which database is designated as the main_db"),
-		NULL,
-		&MainDb,
-		"",
-		PGC_POSTMASTER,
-		GUC_STANDARD,
-		NULL, NULL, NULL);
-
 	DefineCustomIntVariable(
 		"citus.max_adaptive_executor_pool_size",
 		gettext_noop("Sets the maximum number of connections per worker node used by "

src/backend/distributed/sql/citus--12.1-1--12.2-1.sql

@@ -4,29 +4,21 @@
 #include "udfs/citus_internal_database_command/12.2-1.sql"
 #include "udfs/citus_add_rebalance_strategy/12.2-1.sql"
 
-#include "udfs/start_management_transaction/12.2-1.sql"
-#include "udfs/execute_command_on_remote_nodes_as_user/12.2-1.sql"
-#include "udfs/mark_object_distributed/12.2-1.sql"
 DROP FUNCTION pg_catalog.citus_unmark_object_distributed(oid, oid, int);
 #include "udfs/citus_unmark_object_distributed/12.2-1.sql"
-#include "udfs/commit_management_command_2pc/12.2-1.sql"
 
 ALTER TABLE pg_catalog.pg_dist_transaction ADD COLUMN outer_xid xid8;
 
 #include "udfs/citus_internal_acquire_citus_advisory_object_class_lock/12.2-1.sql"
 
 GRANT USAGE ON SCHEMA citus_internal TO PUBLIC;
-REVOKE ALL ON FUNCTION citus_internal.commit_management_command_2pc FROM PUBLIC;
-REVOKE ALL ON FUNCTION citus_internal.execute_command_on_remote_nodes_as_user FROM PUBLIC;
 REVOKE ALL ON FUNCTION citus_internal.find_groupid_for_node FROM PUBLIC;
-REVOKE ALL ON FUNCTION citus_internal.mark_object_distributed FROM PUBLIC;
 REVOKE ALL ON FUNCTION citus_internal.pg_dist_node_trigger_func FROM PUBLIC;
 REVOKE ALL ON FUNCTION citus_internal.pg_dist_rebalance_strategy_trigger_func FROM PUBLIC;
 REVOKE ALL ON FUNCTION citus_internal.pg_dist_shard_placement_trigger_func FROM PUBLIC;
 REVOKE ALL ON FUNCTION citus_internal.refresh_isolation_tester_prepared_statement FROM PUBLIC;
 REVOKE ALL ON FUNCTION citus_internal.replace_isolation_tester_func FROM PUBLIC;
 REVOKE ALL ON FUNCTION citus_internal.restore_isolation_tester_func FROM PUBLIC;
-REVOKE ALL ON FUNCTION citus_internal.start_management_transaction FROM PUBLIC;
 
 #include "udfs/citus_internal_add_colocation_metadata/12.2-1.sql"
 #include "udfs/citus_internal_add_object_metadata/12.2-1.sql"

src/backend/distributed/sql/downgrades/citus--12.2-1--12.1-1.sql

@@ -5,24 +5,9 @@ DROP FUNCTION citus_internal.acquire_citus_advisory_object_class_lock(int, cstri
 
 #include "../udfs/citus_add_rebalance_strategy/10.1-1.sql"
 
-DROP FUNCTION citus_internal.start_management_transaction(
-    outer_xid xid8
-);
-
-DROP FUNCTION citus_internal.execute_command_on_remote_nodes_as_user(
-    query text,
-    username text
-);
-
-DROP FUNCTION citus_internal.mark_object_distributed(
-    classId Oid, objectName text, objectId Oid, connectionUser text
-);
-
 DROP FUNCTION pg_catalog.citus_unmark_object_distributed(oid,oid,int,boolean);
 #include "../udfs/citus_unmark_object_distributed/10.0-1.sql"
 
-DROP FUNCTION citus_internal.commit_management_command_2pc();
-
 ALTER TABLE pg_catalog.pg_dist_transaction DROP COLUMN outer_xid;
 REVOKE USAGE ON SCHEMA citus_internal FROM PUBLIC;