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FLOOR postgres DATETIME_DIFF to match BigQuery #2059

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FLOOR postgres DATETIME_DIFF to match BigQuery #2059

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6 changes: 4 additions & 2 deletions mimic-iii/concepts_postgres/postgres-functions.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -71,15 +71,17 @@ LANGUAGE PLPGSQL;
-- i.e. encapsulate it in single quotes
CREATE OR REPLACE FUNCTION DATETIME_DIFF(endtime TIMESTAMP(3), starttime TIMESTAMP(3), datepart TEXT) RETURNS NUMERIC AS $$
BEGIN
RETURN
-- FLOOR to match BigQuery DATETIME_DIFF truncation (#1549).
RETURN FLOOR(
EXTRACT(EPOCH FROM endtime - starttime) /
CASE
WHEN datepart = 'SECOND' THEN 1.0
WHEN datepart = 'MINUTE' THEN 60.0
WHEN datepart = 'HOUR' THEN 3600.0
WHEN datepart = 'DAY' THEN 24*3600.0
WHEN datepart = 'YEAR' THEN 365.242*24*3600.0
ELSE NULL END;
ELSE NULL END
);
END; $$
LANGUAGE PLPGSQL;

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6 changes: 4 additions & 2 deletions mimic-iv/concepts_postgres/postgres-functions.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -75,15 +75,17 @@ LANGUAGE PLPGSQL;
-- i.e. encapsulate it in single quotes
CREATE OR REPLACE FUNCTION DATETIME_DIFF(endtime TIMESTAMP(3), starttime TIMESTAMP(3), datepart TEXT) RETURNS NUMERIC AS $$
BEGIN
RETURN
-- FLOOR to match BigQuery DATETIME_DIFF truncation (#1549).
RETURN FLOOR(
EXTRACT(EPOCH FROM endtime - starttime) /
CASE
WHEN datepart = 'SECOND' THEN 1.0
WHEN datepart = 'MINUTE' THEN 60.0
WHEN datepart = 'HOUR' THEN 3600.0
WHEN datepart = 'DAY' THEN 24*3600.0
WHEN datepart = 'YEAR' THEN 365.242*24*3600.0
ELSE NULL END;
ELSE NULL END
);
END; $$
LANGUAGE PLPGSQL;

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