Adds alter database stmt from non-main db

src/backend/distributed/commands/utility_hook.c

@@ -213,6 +213,8 @@ static const NonMainDbDistributedStatementInfo NonMainDbSupportedStatements[] =
 	{ T_AlterRoleStmt, NO_DIST_OBJECT_OPERATION, NULL },
 	{ T_GrantStmt, NO_DIST_OBJECT_OPERATION, NonMainDbCheckSupportedObjectTypeForGrant },
 	{ T_CreatedbStmt, NO_DIST_OBJECT_OPERATION, NULL },
+	{ T_AlterDatabaseStmt, NO_DIST_OBJECT_OPERATION, NULL },
+	{ T_AlterDatabaseSetStmt, NO_DIST_OBJECT_OPERATION, NULL },
 	{ T_DropdbStmt, NO_DIST_OBJECT_OPERATION, NULL },
 	{ T_SecLabelStmt, NO_DIST_OBJECT_OPERATION,
 	  NonMainDbCheckSupportedObjectTypeForSecLabel },

src/test/regress/multi_1_schedule

@@ -63,6 +63,7 @@ test: alter_database_propagation
 
 test: citus_shards
 test: reassign_owned
+test: alter_database_from_nonmain_db
 
 # ----------
 # multi_citus_tools tests utility functions written for citus tools

src/test/regress/sql/alter_database_from_nonmain_db.sql

@@ -0,0 +1,8 @@
+
+--SET citus.superuser TO 'postgres';
+set citus.enable_create_database_propagation=on;
+
+create database test_alter_db_from_nonmain_db;
+
+create database altered_database;
+reset citus.enable_create_database_propagation;