46 lines
1.7 KiB
MySQL
46 lines
1.7 KiB
MySQL
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-- Need to add immutable to the hot_rank function in order to index by it
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-- Rank = ScaleFactor * sign(Score) * log(1 + abs(Score)) / (Time + 2)^Gravity
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create or replace function hot_rank(
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score numeric,
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published timestamp without time zone)
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returns integer as $$
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begin
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-- hours_diff:=EXTRACT(EPOCH FROM (timezone('utc',now()) - published))/3600
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return floor(10000*log(greatest(1,score+3)) / power(((EXTRACT(EPOCH FROM (timezone('utc',now()) - published))/3600) + 2), 1.8))::integer;
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end; $$
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LANGUAGE plpgsql
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IMMUTABLE;
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-- Post
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create index idx_post_published on post (published desc);
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create index idx_post_stickied on post (stickied desc);
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-- Post_aggregates
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create index idx_post_aggregates_hot on post_aggregates (hot_rank(score, published) desc, published desc);
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create index idx_post_aggregates_active on post_aggregates (hot_rank(score, newest_comment_time) desc, newest_comment_time desc);
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create index idx_post_aggregates_score on post_aggregates (score desc);
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-- Comment
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create index idx_comment_published on comment (published desc);
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-- Comment_aggregates
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create index idx_comment_aggregates_hot on comment_aggregates (hot_rank(score, published) desc, published desc);
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create index idx_comment_aggregates_score on comment_aggregates (score desc);
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-- User
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create index idx_user_published on user_ (published desc);
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-- User_aggregates
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create index idx_user_aggregates_comment_score on user_aggregates (comment_score desc);
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-- Community
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create index idx_community_published on community (published desc);
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-- Community_aggregates
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create index idx_community_aggregates_hot on community_aggregates (hot_rank(subscribers, published) desc, published desc);
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create index idx_community_aggregates_subscribers on community_aggregates (subscribers desc);
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