The following bug has been logged on the website:
Bug reference: 16177
Logged by: Andrei Pozolotin
Email address: andrei.pozolotin@gmail.com
PostgreSQL version: 11.6
Operating system: linux
Description:
1. use case is to delete rows with oid references to the table before "drop
table"
2. one way to do that is with event_trigger, see code snippet below
3. the problem is that:
pg_event_trigger_ddl_commands() returns empty set for ddl_command_start and
"drop table"
4. this issue was already mentioned before:
https://postgrespro.com/list/thread-id/2394772
5. sample code:
CREATE OR REPLACE FUNCTION pglogical_assign_repset()
RETURNS event_trigger AS $$
DECLARE obj record;
BEGIN
RAISE NOTICE 'pglogical assign: % %', tg_event, tg_tag;
FOR obj IN SELECT * FROM pg_event_trigger_ddl_commands()
LOOP
IF obj.object_type = 'table' THEN
IF obj.schema_name = 'public' THEN
IF tg_tag IN ('CREATE TABLE') THEN
PERFORM
pglogical.replication_set_add_table('default', obj.objid);
END IF;
IF tg_tag IN ('DROP TABLE') THEN
PERFORM
pglogical.replication_set_remove_table('default', obj.objid);
END IF;
END IF;
END IF;
END LOOP;
END;
$$ LANGUAGE plpgsql;
---
DROP EVENT TRIGGER IF EXISTS
pglogical_assign_repset_create;
CREATE EVENT TRIGGER
pglogical_assign_repset_create
ON ddl_command_end
WHEN TAG IN ('CREATE TABLE')
EXECUTE FUNCTION pglogical_assign_repset();
---
DROP EVENT TRIGGER IF EXISTS
pglogical_assign_repset_delete;
CREATE EVENT TRIGGER
pglogical_assign_repset_delete
ON ddl_command_start
WHEN TAG IN ('DROP TABLE')
EXECUTE FUNCTION pglogical_assign_repset();
---
