pg_event_trigger_ddl_commands() with DROP TABLE command - postgresql

Question

CREATE OR REPLACE FUNCTION ddl_command_test()
RETURNS event_trigger
AS $$
DECLARE
obj record;
BEGIN
FOR obj IN SELECT * FROM pg_event_trigger_ddl_commands()
LOOP
RAISE NOTICE '% commnad on oid: %',
tg_tag,
obj.objid;
RAISE NOTICE 'triggered';
END LOOP;
END; $$ LANGUAGE plpgsql;
CREATE EVENT TRIGGER test_ddl ON ddl_command_end
EXECUTE FUNCTION ddl_command_test();
While pg_event_trigger_ddl_commands() function returns info for table creation:
CREATE TABLE test_table(
col int
);
It not prints notification message when table is dropped:
DROP TABLE test_table;
Don't get why, because event-trigger-matrix shows that ddl_​command_​end includes DROP TABLE command also.

Answer 1

Although the documentation event-trigger-matrix says that ddl_command_end can be used for DROP statements, I also struggled with that issue in the past.
Thereby, I found this workaround, which involves creating a specific function that fetches FROM pg_event_trigger_dropped_objects(), to notify when the DROP statement is used.
CREATE OR REPLACE FUNCTION ddl_drop_command_test()
RETURNS event_trigger
AS $$
DECLARE
obj record;
BEGIN
FOR obj IN SELECT * FROM pg_event_trigger_dropped_objects()
LOOP
RAISE NOTICE '% commnad on oid: %',
tg_tag,
obj.objid;
RAISE NOTICE 'triggered';
END LOOP;
END; $$ LANGUAGE plpgsql;
Further, you need to use ON sql_drop to create your event trigger. The WHEN TAG can be incremented with DROP SCHEMA and other Postgres objects.
CREATE EVENT TRIGGER drop_test ON sql_drop
WHEN TAG IN ('DROP TABLE')
EXECUTE PROCEDURE ddl_drop_command_test();