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Add more tests for EXTRACT of date type

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EXTRACT of date type is implemented as a wrapper around EXTRACT of
timestamp, so the code is already tested there.  But the externally
visible behavior of EXTRACT on date is not recorded anywhere.  Since
there is some discussion about reimplementing or refactoring some of
this, add some more explicit tests of EXTRACT on date, similar in
structure to existing EXTRACT tests on other data types.

Discussion: https://www.postgresql.org/message-id/flat/42b73d2d-da12-ba9f-570a-420e0cce19d9@phystech.edu
This commit is contained in:
Peter Eisentraut
2020-09-10 14:52:36 +02:00
parent 994a58407c
commit 540612fa46
3 changed files with 228 additions and 17 deletions
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49
src/test/regress/sql/date.sql
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@@ -20,12 +20,13 @@ INSERT INTO DATE_TBL VALUES ('2000-04-03');
INSERT INTO DATE_TBL VALUES ('2038-04-08');
INSERT INTO DATE_TBL VALUES ('2039-04-09');
INSERT INTO DATE_TBL VALUES ('2040-04-10');
INSERT INTO DATE_TBL VALUES ('2040-04-10 BC');
SELECT f1 AS "Fifteen" FROM DATE_TBL;
SELECT f1 FROM DATE_TBL;
SELECT f1 AS "Nine" FROM DATE_TBL WHERE f1 < '2000-01-01';
SELECT f1 FROM DATE_TBL WHERE f1 < '2000-01-01';
SELECT f1 AS "Three" FROM DATE_TBL
SELECT f1 FROM DATE_TBL
WHERE f1 BETWEEN '2000-01-01' AND '2001-01-01';
--
@@ -218,6 +219,23 @@ SELECT date 'tomorrow' - date 'yesterday' AS "Two days";
--
-- test extract!
--
SELECT f1 as "date",
date_part('year', f1) AS year,
date_part('month', f1) AS month,
date_part('day', f1) AS day,
date_part('quarter', f1) AS quarter,
date_part('decade', f1) AS decade,
date_part('century', f1) AS century,
date_part('millennium', f1) AS millennium,
date_part('isoyear', f1) AS isoyear,
date_part('week', f1) AS week,
date_part('dow', f1) AS dow,
date_part('isodow', f1) AS isodow,
date_part('doy', f1) AS doy,
date_part('julian', f1) AS julian,
date_part('epoch', f1) AS epoch
FROM date_tbl;
--
-- epoch
--
SELECT EXTRACT(EPOCH FROM DATE '1970-01-01'); -- 0
@@ -264,6 +282,31 @@ SELECT EXTRACT(DECADE FROM DATE '0012-12-31 BC'); -- -2
SELECT EXTRACT(CENTURY FROM NOW())>=21 AS True; -- true
SELECT EXTRACT(CENTURY FROM TIMESTAMP '1970-03-20 04:30:00.00000'); -- 20
--
-- all possible fields
--
SELECT EXTRACT(MICROSECONDS FROM DATE '2020-08-11');
SELECT EXTRACT(MILLISECONDS FROM DATE '2020-08-11');
SELECT EXTRACT(SECOND FROM DATE '2020-08-11');
SELECT EXTRACT(MINUTE FROM DATE '2020-08-11');
SELECT EXTRACT(HOUR FROM DATE '2020-08-11');
SELECT EXTRACT(DAY FROM DATE '2020-08-11');
SELECT EXTRACT(MONTH FROM DATE '2020-08-11');
SELECT EXTRACT(YEAR FROM DATE '2020-08-11');
SELECT EXTRACT(DECADE FROM DATE '2020-08-11');
SELECT EXTRACT(CENTURY FROM DATE '2020-08-11');
SELECT EXTRACT(MILLENNIUM FROM DATE '2020-08-11');
SELECT EXTRACT(ISOYEAR FROM DATE '2020-08-11');
SELECT EXTRACT(QUARTER FROM DATE '2020-08-11');
SELECT EXTRACT(WEEK FROM DATE '2020-08-11');
SELECT EXTRACT(DOW FROM DATE '2020-08-11');
SELECT EXTRACT(ISODOW FROM DATE '2020-08-11');
SELECT EXTRACT(DOY FROM DATE '2020-08-11');
SELECT EXTRACT(TIMEZONE FROM DATE '2020-08-11');
SELECT EXTRACT(TIMEZONE_M FROM DATE '2020-08-11');
SELECT EXTRACT(TIMEZONE_H FROM DATE '2020-08-11');
SELECT EXTRACT(EPOCH FROM DATE '2020-08-11');
SELECT EXTRACT(JULIAN FROM DATE '2020-08-11');
--
-- test trunc function!
--
SELECT DATE_TRUNC('MILLENNIUM', TIMESTAMP '1970-03-20 04:30:00.00000'); -- 1001