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MDEV-13995 MAX(timestamp) returns a wrong result near DST change

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This commit is contained in:
Alexander Barkov
2018-12-08 19:39:23 +04:00
parent 5b3db87134
commit 34eb98387f
26 changed files with 1850 additions and 16 deletions
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41
mysql-test/main/old-mode.result
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@ -180,3 +180,44 @@ a unix_timestamp(a)
2010-10-31 02:25:26 1288481126
drop table t1, t2;
set time_zone=DEFAULT;
#
# MDEV-13995 MAX(timestamp) returns a wrong result near DST change
#
SET global mysql56_temporal_format=false;
SET time_zone='+00:00';
CREATE TABLE t1 (a TIMESTAMP(0));
INSERT INTO t1 VALUES (FROM_UNIXTIME(1288477526) /*summer time in Moscow*/);
INSERT INTO t1 VALUES (FROM_UNIXTIME(1288477526+3599) /*winter time in Moscow*/);
SET time_zone='Europe/Moscow';
SELECT a, COALESCE(a), UNIX_TIMESTAMP(a) FROM t1;
a COALESCE(a) UNIX_TIMESTAMP(a)
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SELECT MIN(a), UNIX_TIMESTAMP(MIN(a)) AS a FROM t1;
MIN(a) a
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SELECT MAX(a), UNIX_TIMESTAMP(MAX(a)) AS a FROM t1;
MAX(a) a
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SELECT t1.a, UNIX_TIMESTAMP(t1.a), t2.a, UNIX_TIMESTAMP(t2.a) FROM t1 t1, t1 t2 WHERE t1.a=t2.a;
a UNIX_TIMESTAMP(t1.a) a UNIX_TIMESTAMP(t2.a)
2010-10-31 02:25:26 1288477526 2010-10-31 02:25:26 1288477526
2010-10-31 02:25:25 1288481125 2010-10-31 02:25:25 1288481125
ALTER TABLE t1 MODIFY a TIMESTAMP(1);
SELECT a, COALESCE(a), UNIX_TIMESTAMP(a) FROM t1;
a COALESCE(a) UNIX_TIMESTAMP(a)
2010-10-31 02:25:26.0 2010-10-31 02:25:26.0 1288477526.0
2010-10-31 02:25:25.0 2010-10-31 02:25:25.0 1288481125.0
SELECT MIN(a), UNIX_TIMESTAMP(MIN(a)) AS a FROM t1;
MIN(a) a
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SELECT MAX(a), UNIX_TIMESTAMP(MAX(a)) AS a FROM t1;
MAX(a) a
2010-10-31 02:25:25.0 1288481125.0
SELECT t1.a, UNIX_TIMESTAMP(t1.a), t2.a, UNIX_TIMESTAMP(t2.a) FROM t1 t1, t1 t2 WHERE t1.a=t2.a;
a UNIX_TIMESTAMP(t1.a) a UNIX_TIMESTAMP(t2.a)
2010-10-31 02:25:26.0 1288477526.0 2010-10-31 02:25:26.0 1288477526.0
2010-10-31 02:25:25.0 1288481125.0 2010-10-31 02:25:25.0 1288481125.0
DROP TABLE t1;
SET time_zone=DEFAULT;
SET global mysql56_temporal_format=true;