26 lines
833 B
MySQL
26 lines
833 B
MySQL
|
-- 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;
|