lemmy/migrations/2023-07-18-082614_post_aggregates_community_id/down.sql
Sander Saarend b511c2e6cb
Denormalize community_id into post_aggregates for a 1000x speed-up when loading posts (#3653)
* Denormalize community_id into post_aggregates for a 1000x speed-up when loading posts

* Remove unused index

* Add creator_id to post_aggregates

* Use post_aggregates as main table for PostQuery

* Make post_aggregates the main table for PostView

* Reformat SQL
2023-07-20 11:13:21 -04:00

20 lines
567 B
PL/PgSQL

-- This file should undo anything in `up.sql`
CREATE OR REPLACE FUNCTION post_aggregates_post()
RETURNS trigger
LANGUAGE plpgsql
AS
$$
BEGIN
IF (TG_OP = 'INSERT') THEN
INSERT INTO post_aggregates (post_id, published, newest_comment_time, newest_comment_time_necro)
VALUES (NEW.id, NEW.published, NEW.published, NEW.published);
ELSIF (TG_OP = 'DELETE') THEN
DELETE FROM post_aggregates WHERE post_id = OLD.id;
END IF;
RETURN NULL;
END
$$;
ALTER TABLE post_aggregates DROP COLUMN community_id, DROP COLUMN creator_id;