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);