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CREATE OR REPLACE FUNCTION pgl_ddl_deploy.execute_queued_ddl()
RETURNS trigger
LANGUAGE plpgsql
AS $function$
BEGIN
/***
Native logical replication does not support row filtering, so as a result,
we need to do processing downstream to ensure we only process rows we care about.
For example, if we propagate some DDL to system 1 and some other to system 2,
all rows will still come through this trigger. We filter out rows based on
matching pubnames with pg_subscription.subpublications
If a row arrives here (the subscriber), it must mean that it was propagated
***/
-- This handles potential duplicates with multiple subscriptions to same publisher db.
IF EXISTS (
SELECT NEW.*
INTERSECT
SELECT * FROM pgl_ddl_deploy.queue) THEN
RETURN NULL;
END IF;
IF NEW.message_type = pgl_ddl_deploy.queue_ddl_message_type() AND
(pgl_ddl_deploy.override() OR ((SELECT COUNT(1) FROM pg_subscription s
WHERE subpublications && NEW.pubnames) > 0)) THEN
-- See https://www.postgresql.org/message-id/CAMa1XUh7ZVnBzORqjJKYOv4_pDSDUCvELRbkF0VtW7pvDW9rZw@mail.gmail.com
IF NEW.message ~* 'pgl_ddl_deploy.notify_subscription_refresh' THEN
INSERT INTO pgl_ddl_deploy.subscriber_logs
(set_name,
provider_pid,
provider_node_name,
provider_set_config_id,
executed_as_role,
subscriber_pid,
executed_at,
ddl_sql,
full_ddl_sql,
succeeded,
error_message)
VALUES
(NEW.pubnames[1],
NULL,
NULL,
NULL,
current_role,
pg_backend_pid(),
current_timestamp,
NEW.message,
NEW.message,
FALSE,
'Unsupported automated ALTER SUBSCRIPTION ... REFRESH PUBLICATION until bugfix');
ELSE
EXECUTE 'SET ROLE '||quote_ident(NEW.role)||';';
EXECUTE NEW.message::TEXT;
END IF;
RETURN NEW;
ELSE
RETURN NULL;
END IF;
END;
$function$
;
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