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17 lines
443 B
MySQL
17 lines
443 B
MySQL
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CREATE OR REPLACE FUNCTION hot_rank(score numeric, published timestamp without time zone)
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RETURNS integer
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AS $$
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DECLARE
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hours_diff numeric := EXTRACT(EPOCH FROM (timezone('utc', now()) - published)) / 3600;
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BEGIN
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IF (hours_diff > 0) THEN
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RETURN floor(10000 * log(greatest(1, score + 3)) / power((hours_diff + 2), 1.8))::integer;
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ELSE
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RETURN 0;
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END IF;
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END;
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$$
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LANGUAGE plpgsql
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IMMUTABLE PARALLEL SAFE;
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