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a2da77cdb4661826482ebf2ddba1f953bc74afe4
postgresql/src/test/regress/sql/timestamp.sql
Peter Eisentraut a2da77cdb4 Change return type of EXTRACT to numeric 
The previous implementation of EXTRACT mapped internally to
date_part(), which returned type double precision (since it was
implemented long before the numeric type existed).  This can lead to
imprecise output in some cases, so returning numeric would be
preferrable.  Changing the return type of an existing function is a
bit risky, so instead we do the following:  We implement a new set of
functions, which are now called "extract", in parallel to the existing
date_part functions.  They work the same way internally but use
numeric instead of float8.  The EXTRACT construct is now mapped by the
parser to these new extract functions.  That way, dumps of views
etc. from old versions (which would use date_part) continue to work
unchanged, but new uses will map to the new extract functions.

Additionally, the reverse compilation of EXTRACT now reproduces the
original syntax, using the new mechanism introduced in
40c24bfef92530bd846e111c1742c2a54441c62c.

The following minor changes of behavior result from the new
implementation:

- The column name from an isolated EXTRACT call is now "extract"
  instead of "date_part".

- Extract from date now rejects inappropriate field names such as
  HOUR.  It was previously mapped internally to extract from
  timestamp, so it would silently accept everything appropriate for
  timestamp.

- Return values when extracting fields with possibly fractional
  values, such as second and epoch, now have the full scale that the
  value has internally (so, for example, '1.000000' instead of just
  '1').

Reported-by: Petr Fedorov <petr.fedorov@phystech.edu>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/42b73d2d-da12-ba9f-570a-420e0cce19d9@phystech.edu
2021-04-06 07:20:42 +02:00

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--
-- TIMESTAMP
--
CREATE TABLE TIMESTAMP_TBL (d1 timestamp(2) without time zone);
-- Test shorthand input values
-- We can't just "select" the results since they aren't constants; test for
-- equality instead. We can do that by running the test inside a transaction
-- block, within which the value of 'now' shouldn't change, and so these
-- related values shouldn't either.
BEGIN;
INSERT INTO TIMESTAMP_TBL VALUES ('today');
INSERT INTO TIMESTAMP_TBL VALUES ('yesterday');
INSERT INTO TIMESTAMP_TBL VALUES ('tomorrow');
-- time zone should be ignored by this data type
INSERT INTO TIMESTAMP_TBL VALUES ('tomorrow EST');
INSERT INTO TIMESTAMP_TBL VALUES ('tomorrow zulu');
SELECT count(*) AS One FROM TIMESTAMP_TBL WHERE d1 = timestamp without time zone 'today';
SELECT count(*) AS Three FROM TIMESTAMP_TBL WHERE d1 = timestamp without time zone 'tomorrow';
SELECT count(*) AS One FROM TIMESTAMP_TBL WHERE d1 = timestamp without time zone 'yesterday';
COMMIT;
DELETE FROM TIMESTAMP_TBL;
-- Verify that 'now' *does* change over a reasonable interval such as 100 msec,
-- and that it doesn't change over the same interval within a transaction block
INSERT INTO TIMESTAMP_TBL VALUES ('now');
SELECT pg_sleep(0.1);
BEGIN;
INSERT INTO TIMESTAMP_TBL VALUES ('now');
SELECT pg_sleep(0.1);
INSERT INTO TIMESTAMP_TBL VALUES ('now');
SELECT pg_sleep(0.1);
SELECT count(*) AS two FROM TIMESTAMP_TBL WHERE d1 = timestamp(2) without time zone 'now';
SELECT count(d1) AS three, count(DISTINCT d1) AS two FROM TIMESTAMP_TBL;
COMMIT;
TRUNCATE TIMESTAMP_TBL;
-- Special values
INSERT INTO TIMESTAMP_TBL VALUES ('-infinity');
INSERT INTO TIMESTAMP_TBL VALUES ('infinity');
INSERT INTO TIMESTAMP_TBL VALUES ('epoch');
-- Postgres v6.0 standard output format
INSERT INTO TIMESTAMP_TBL VALUES ('Mon Feb 10 17:32:01 1997 PST');
-- Variations on Postgres v6.1 standard output format
INSERT INTO TIMESTAMP_TBL VALUES ('Mon Feb 10 17:32:01.000001 1997 PST');
INSERT INTO TIMESTAMP_TBL VALUES ('Mon Feb 10 17:32:01.999999 1997 PST');
INSERT INTO TIMESTAMP_TBL VALUES ('Mon Feb 10 17:32:01.4 1997 PST');
INSERT INTO TIMESTAMP_TBL VALUES ('Mon Feb 10 17:32:01.5 1997 PST');
INSERT INTO TIMESTAMP_TBL VALUES ('Mon Feb 10 17:32:01.6 1997 PST');
-- ISO 8601 format
INSERT INTO TIMESTAMP_TBL VALUES ('1997-01-02');
INSERT INTO TIMESTAMP_TBL VALUES ('1997-01-02 03:04:05');
INSERT INTO TIMESTAMP_TBL VALUES ('1997-02-10 17:32:01-08');
INSERT INTO TIMESTAMP_TBL VALUES ('1997-02-10 17:32:01-0800');
INSERT INTO TIMESTAMP_TBL VALUES ('1997-02-10 17:32:01 -08:00');
INSERT INTO TIMESTAMP_TBL VALUES ('19970210 173201 -0800');
INSERT INTO TIMESTAMP_TBL VALUES ('1997-06-10 17:32:01 -07:00');
INSERT INTO TIMESTAMP_TBL VALUES ('2001-09-22T18:19:20');
-- POSIX format (note that the timezone abbrev is just decoration here)
INSERT INTO TIMESTAMP_TBL VALUES ('2000-03-15 08:14:01 GMT+8');
INSERT INTO TIMESTAMP_TBL VALUES ('2000-03-15 13:14:02 GMT-1');
INSERT INTO TIMESTAMP_TBL VALUES ('2000-03-15 12:14:03 GMT-2');
INSERT INTO TIMESTAMP_TBL VALUES ('2000-03-15 03:14:04 PST+8');
INSERT INTO TIMESTAMP_TBL VALUES ('2000-03-15 02:14:05 MST+7:00');
-- Variations for acceptable input formats
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 10 17:32:01 1997 -0800');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 10 17:32:01 1997');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 10 5:32PM 1997');
INSERT INTO TIMESTAMP_TBL VALUES ('1997/02/10 17:32:01-0800');
INSERT INTO TIMESTAMP_TBL VALUES ('1997-02-10 17:32:01 PST');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb-10-1997 17:32:01 PST');
INSERT INTO TIMESTAMP_TBL VALUES ('02-10-1997 17:32:01 PST');
INSERT INTO TIMESTAMP_TBL VALUES ('19970210 173201 PST');
set datestyle to ymd;
INSERT INTO TIMESTAMP_TBL VALUES ('97FEB10 5:32:01PM UTC');
INSERT INTO TIMESTAMP_TBL VALUES ('97/02/10 17:32:01 UTC');
reset datestyle;
INSERT INTO TIMESTAMP_TBL VALUES ('1997.041 17:32:01 UTC');
INSERT INTO TIMESTAMP_TBL VALUES ('19970210 173201 America/New_York');
-- this fails (even though TZ is a no-op, we still look it up)
INSERT INTO TIMESTAMP_TBL VALUES ('19970710 173201 America/Does_not_exist');
-- Check date conversion and date arithmetic
INSERT INTO TIMESTAMP_TBL VALUES ('1997-06-10 18:32:01 PDT');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 10 17:32:01 1997');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 11 17:32:01 1997');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 12 17:32:01 1997');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 13 17:32:01 1997');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 14 17:32:01 1997');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 15 17:32:01 1997');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 16 17:32:01 1997');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 16 17:32:01 0097 BC');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 16 17:32:01 0097');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 16 17:32:01 0597');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 16 17:32:01 1097');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 16 17:32:01 1697');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 16 17:32:01 1797');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 16 17:32:01 1897');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 16 17:32:01 1997');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 16 17:32:01 2097');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 28 17:32:01 1996');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 29 17:32:01 1996');
INSERT INTO TIMESTAMP_TBL VALUES ('Mar 01 17:32:01 1996');
INSERT INTO TIMESTAMP_TBL VALUES ('Dec 30 17:32:01 1996');
INSERT INTO TIMESTAMP_TBL VALUES ('Dec 31 17:32:01 1996');
INSERT INTO TIMESTAMP_TBL VALUES ('Jan 01 17:32:01 1997');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 28 17:32:01 1997');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 29 17:32:01 1997');
INSERT INTO TIMESTAMP_TBL VALUES ('Mar 01 17:32:01 1997');
INSERT INTO TIMESTAMP_TBL VALUES ('Dec 30 17:32:01 1997');
INSERT INTO TIMESTAMP_TBL VALUES ('Dec 31 17:32:01 1997');
INSERT INTO TIMESTAMP_TBL VALUES ('Dec 31 17:32:01 1999');
INSERT INTO TIMESTAMP_TBL VALUES ('Jan 01 17:32:01 2000');
INSERT INTO TIMESTAMP_TBL VALUES ('Dec 31 17:32:01 2000');
INSERT INTO TIMESTAMP_TBL VALUES ('Jan 01 17:32:01 2001');
-- Currently unsupported syntax and ranges
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 16 17:32:01 -0097');
INSERT INTO TIMESTAMP_TBL VALUES ('Feb 16 17:32:01 5097 BC');
SELECT d1 FROM TIMESTAMP_TBL;
-- Check behavior at the boundaries of the timestamp range
SELECT '4714-11-24 00:00:00 BC'::timestamp;
SELECT '4714-11-23 23:59:59 BC'::timestamp; -- out of range
SELECT '294276-12-31 23:59:59'::timestamp;
SELECT '294277-01-01 00:00:00'::timestamp; -- out of range
-- Demonstrate functions and operators
SELECT d1 FROM TIMESTAMP_TBL
WHERE d1 > timestamp without time zone '1997-01-02';
SELECT d1 FROM TIMESTAMP_TBL
WHERE d1 < timestamp without time zone '1997-01-02';
SELECT d1 FROM TIMESTAMP_TBL
WHERE d1 = timestamp without time zone '1997-01-02';
SELECT d1 FROM TIMESTAMP_TBL
WHERE d1 != timestamp without time zone '1997-01-02';
SELECT d1 FROM TIMESTAMP_TBL
WHERE d1 <= timestamp without time zone '1997-01-02';
SELECT d1 FROM TIMESTAMP_TBL
WHERE d1 >= timestamp without time zone '1997-01-02';
SELECT d1 - timestamp without time zone '1997-01-02' AS diff
FROM TIMESTAMP_TBL WHERE d1 BETWEEN '1902-01-01' AND '2038-01-01';
SELECT date_trunc( 'week', timestamp '2004-02-29 15:44:17.71393' ) AS week_trunc;
-- verify date_bin behaves the same as date_trunc for relevant intervals
-- case 1: AD dates, origin < input
SELECT
str,
interval,
date_trunc(str, ts) = date_bin(interval::interval, ts, timestamp '2001-01-01') AS equal
FROM (
VALUES
('week', '7 d'),
('day', '1 d'),
('hour', '1 h'),
('minute', '1 m'),
('second', '1 s'),
('millisecond', '1 ms'),
('microsecond', '1 us')
) intervals (str, interval),
(VALUES (timestamp '2020-02-29 15:44:17.71393')) ts (ts);
-- case 2: BC dates, origin < input
SELECT
str,
interval,
date_trunc(str, ts) = date_bin(interval::interval, ts, timestamp '2000-01-01 BC') AS equal
FROM (
VALUES
('week', '7 d'),
('day', '1 d'),
('hour', '1 h'),
('minute', '1 m'),
('second', '1 s'),
('millisecond', '1 ms'),
('microsecond', '1 us')
) intervals (str, interval),
(VALUES (timestamp '0055-6-10 15:44:17.71393 BC')) ts (ts);
-- bin timestamps into arbitrary intervals
SELECT
interval,
ts,
origin,
date_bin(interval::interval, ts, origin)
FROM (
VALUES
('15 days'),
('2 hours'),
('1 hour 30 minutes'),
('15 minutes'),
('10 seconds'),
('100 milliseconds'),
('250 microseconds')
) intervals (interval),
(VALUES (timestamp '2020-02-11 15:44:17.71393')) ts (ts),
(VALUES (timestamp '2001-01-01')) origin (origin);
-- shift bins using the origin parameter:
SELECT date_bin('5 min'::interval, timestamp '2020-02-01 01:01:01', timestamp '2020-02-01 00:02:30');
-- disallow intervals with months or years
SELECT date_bin('5 months'::interval, timestamp '2020-02-01 01:01:01', timestamp '2001-01-01');
SELECT date_bin('5 years'::interval, timestamp '2020-02-01 01:01:01', timestamp '2001-01-01');
-- Test casting within a BETWEEN qualifier
SELECT d1 - timestamp without time zone '1997-01-02' AS diff
FROM TIMESTAMP_TBL
WHERE d1 BETWEEN timestamp without time zone '1902-01-01'
AND timestamp without time zone '2038-01-01';
-- DATE_PART (timestamp_part)
SELECT d1 as "timestamp",
date_part( 'year', d1) AS year, date_part( 'month', d1) AS month,
date_part( 'day', d1) AS day, date_part( 'hour', d1) AS hour,
date_part( 'minute', d1) AS minute, date_part( 'second', d1) AS second
FROM TIMESTAMP_TBL;
SELECT d1 as "timestamp",
date_part( 'quarter', d1) AS quarter, date_part( 'msec', d1) AS msec,
date_part( 'usec', d1) AS usec
FROM TIMESTAMP_TBL;
SELECT d1 as "timestamp",
date_part( 'isoyear', d1) AS isoyear, date_part( 'week', d1) AS week,
date_part( 'isodow', d1) AS isodow, date_part( 'dow', d1) AS dow,
date_part( 'doy', d1) AS doy
FROM TIMESTAMP_TBL;
SELECT d1 as "timestamp",
date_part( 'decade', d1) AS decade,
date_part( 'century', d1) AS century,
date_part( 'millennium', d1) AS millennium,
round(date_part( 'julian', d1)) AS julian,
date_part( 'epoch', d1) AS epoch
FROM TIMESTAMP_TBL;
-- extract implementation is mostly the same as date_part, so only
-- test a few cases for additional coverage.
SELECT d1 as "timestamp",
extract(microseconds from d1) AS microseconds,
extract(milliseconds from d1) AS milliseconds,
extract(seconds from d1) AS seconds,
round(extract(julian from d1)) AS julian,
extract(epoch from d1) AS epoch
FROM TIMESTAMP_TBL;
-- value near upper bound uses special case in code
SELECT date_part('epoch', '294270-01-01 00:00:00'::timestamp);
SELECT extract(epoch from '294270-01-01 00:00:00'::timestamp);
-- another internal overflow test case
SELECT extract(epoch from '5000-01-01 00:00:00'::timestamp);
-- TO_CHAR()
SELECT to_char(d1, 'DAY Day day DY Dy dy MONTH Month month RM MON Mon mon')
FROM TIMESTAMP_TBL;
SELECT to_char(d1, 'FMDAY FMDay FMday FMMONTH FMMonth FMmonth FMRM')
FROM TIMESTAMP_TBL;
SELECT to_char(d1, 'Y,YYY YYYY YYY YY Y CC Q MM WW DDD DD D J')
FROM TIMESTAMP_TBL;
SELECT to_char(d1, 'FMY,YYY FMYYYY FMYYY FMYY FMY FMCC FMQ FMMM FMWW FMDDD FMDD FMD FMJ')
FROM TIMESTAMP_TBL;
SELECT to_char(d1, 'HH HH12 HH24 MI SS SSSS')
FROM TIMESTAMP_TBL;
SELECT to_char(d1, E'"HH:MI:SS is" HH:MI:SS "\\"text between quote marks\\""')
FROM TIMESTAMP_TBL;
SELECT to_char(d1, 'HH24--text--MI--text--SS')
FROM TIMESTAMP_TBL;
SELECT to_char(d1, 'YYYYTH YYYYth Jth')
FROM TIMESTAMP_TBL;
SELECT to_char(d1, 'YYYY A.D. YYYY a.d. YYYY bc HH:MI:SS P.M. HH:MI:SS p.m. HH:MI:SS pm')
FROM TIMESTAMP_TBL;
SELECT to_char(d1, 'IYYY IYY IY I IW IDDD ID')
FROM TIMESTAMP_TBL;
SELECT to_char(d1, 'FMIYYY FMIYY FMIY FMI FMIW FMIDDD FMID')
FROM TIMESTAMP_TBL;
SELECT to_char(d, 'FF1 FF2 FF3 FF4 FF5 FF6 ff1 ff2 ff3 ff4 ff5 ff6 MS US')
FROM (VALUES
('2018-11-02 12:34:56'::timestamp),
('2018-11-02 12:34:56.78'),
('2018-11-02 12:34:56.78901'),
('2018-11-02 12:34:56.78901234')
) d(d);
-- timestamp numeric fields constructor
SELECT make_timestamp(2014, 12, 28, 6, 30, 45.887);
SELECT make_timestamp(-44, 3, 15, 12, 30, 15);
-- should fail
select make_timestamp(0, 7, 15, 12, 30, 15);
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