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