-- Rank = ScaleFactor * sign(Score) * log(1 + abs(Score)) / (Time + 2)^Gravity create or replace function hot_rank( score numeric, published timestamp without time zone) returns integer as $$ begin -- hours_diff:=EXTRACT(EPOCH FROM (timezone('utc',now()) - published))/3600 return floor(10000*log(greatest(1,score+3)) / power(((EXTRACT(EPOCH FROM (timezone('utc',now()) - published))/3600) + 2), 1.8))::integer; end; $$ LANGUAGE plpgsql; drop index idx_post_published, idx_post_stickied, idx_post_aggregates_hot, idx_post_aggregates_active, idx_post_aggregates_score, idx_comment_published, idx_comment_aggregates_hot, idx_comment_aggregates_score, idx_user_published, idx_user_aggregates_comment_score, idx_community_published, idx_community_aggregates_hot, idx_community_aggregates_subscribers;