lemmy/migrations/2023-07-26-000217_create_controversial_indexes/down.sql

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-- Update comment_aggregates_score trigger function to exclude controversy_rank update
CREATE OR REPLACE FUNCTION comment_aggregates_score ()
RETURNS TRIGGER
LANGUAGE plpgsql
AS $$
BEGIN
IF (TG_OP = 'INSERT') THEN
UPDATE
comment_aggregates ca
SET
score = score + NEW.score,
upvotes = CASE WHEN NEW.score = 1 THEN
upvotes + 1
ELSE
upvotes
END,
downvotes = CASE WHEN NEW.score = - 1 THEN
downvotes + 1
ELSE
downvotes
END
WHERE
ca.comment_id = NEW.comment_id;
ELSIF (TG_OP = 'DELETE') THEN
-- Join to comment because that comment may not exist anymore
UPDATE
comment_aggregates ca
SET
score = score - OLD.score,
upvotes = CASE WHEN OLD.score = 1 THEN
upvotes - 1
ELSE
upvotes
END,
downvotes = CASE WHEN OLD.score = - 1 THEN
downvotes - 1
ELSE
downvotes
END
FROM
comment c
WHERE
ca.comment_id = c.id
AND ca.comment_id = OLD.comment_id;
END IF;
RETURN NULL;
END
$$;
-- Update post_aggregates_score trigger function to exclude controversy_rank update
CREATE OR REPLACE FUNCTION post_aggregates_score ()
RETURNS TRIGGER
LANGUAGE plpgsql
AS $$
BEGIN
IF (TG_OP = 'INSERT') THEN
UPDATE
post_aggregates pa
SET
score = score + NEW.score,
upvotes = CASE WHEN NEW.score = 1 THEN
upvotes + 1
ELSE
upvotes
END,
downvotes = CASE WHEN NEW.score = - 1 THEN
downvotes + 1
ELSE
downvotes
END
WHERE
pa.post_id = NEW.post_id;
ELSIF (TG_OP = 'DELETE') THEN
-- Join to post because that post may not exist anymore
UPDATE
post_aggregates pa
SET
score = score - OLD.score,
upvotes = CASE WHEN OLD.score = 1 THEN
upvotes - 1
ELSE
upvotes
END,
downvotes = CASE WHEN OLD.score = - 1 THEN
downvotes - 1
ELSE
downvotes
END
FROM
post p
WHERE
pa.post_id = p.id
AND pa.post_id = OLD.post_id;
END IF;
RETURN NULL;
END
$$;
-- Drop the indexes
DROP INDEX IF EXISTS idx_post_aggregates_featured_local_controversy;
DROP INDEX IF EXISTS idx_post_aggregates_featured_community_controversy;
DROP INDEX IF EXISTS idx_comment_aggregates_controversy;
-- Remove the added columns from the tables
ALTER TABLE post_aggregates
DROP COLUMN controversy_rank;
ALTER TABLE comment_aggregates
DROP COLUMN controversy_rank;
-- Remove function
DROP FUNCTION controversy_rank (numeric, numeric);