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-- First rename current newest comment time to newest_comment_time_necro
-- necro means that time is limited to 2 days, whereas newest_comment_time ignores that.
alter table post_aggregates rename column newest_comment_time to newest_comment_time_necro;
-- Add the newest_comment_time column
alter table post_aggregates add column newest_comment_time timestamp not null default now();
-- Set the current newest_comment_time based on the old ones
update post_aggregates set newest_comment_time = newest_comment_time_necro;
-- Add the indexes for this new column
create index idx_post_aggregates_newest_comment_time on post_aggregates (newest_comment_time desc);
create index idx_post_aggregates_stickied_newest_comment_time on post_aggregates (stickied desc, newest_comment_time desc);
-- Forgot to add index w/ stickied first for most comments:
create index idx_post_aggregates_stickied_comments on post_aggregates (stickied desc, comments desc);
-- Alter the comment trigger to set the newest_comment_time, and newest_comment_time_necro
create or replace function post_aggregates_comment_count()
returns trigger language plpgsql
as $$
begin
IF (TG_OP = 'INSERT') THEN
update post_aggregates pa
set comments = comments + 1,
newest_comment_time = NEW.published
where pa.post_id = NEW.post_id;
-- A 2 day necro-bump limit
update post_aggregates pa
set newest_comment_time_necro = NEW.published
where pa.post_id = NEW.post_id
and published > ('now'::timestamp - '2 days'::interval);
ELSIF (TG_OP = 'DELETE') THEN
-- Join to post because that post may not exist anymore
update post_aggregates pa
set comments = comments - 1
from post p
where pa.post_id = p.id
and pa.post_id = OLD.post_id;
END IF;
return null;
end $$;