Details
-
Bug
-
Status: Confirmed (View Workflow)
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Major
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Resolution: Unresolved
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5.5.62, 10.11.1
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ubuntu 18.04
Description
Description:
In theory, the result of sql2(DISTINCT) ⊆ the result of sql1:
SELECT PI()+~1&f2 AS f1 FROM (SELECT DATE_SUB(DATE_ADD('2009-10-15', INTERVAL 1 MICROSECOND), INTERVAL 1 DAY_SECOND) AS f2 FROM t) AS t1; -- sql1 |
SELECT PI()+~1&f2 AS f1 FROM (SELECT DISTINCT DATE_SUB(DATE_ADD('2009-10-15', INTERVAL 1 MICROSECOND), INTERVAL 1 DAY_SECOND) AS f2 FROM t) AS t1; -- sql2 |
However, the value 20091014235959 changed to 2009 after adding DISTINCT, seems like a logical bug:
mysql> select version(); |
+-----------------------------------------+ |
| version() |
|
+-----------------------------------------+ |
| 10.11.1-MariaDB-1:10.11.1+maria~ubu2204 |
|
+-----------------------------------------+ |
1 row in set (0.00 sec) |
|
|
mysql> SELECT PI()+~1&f2 AS f1 FROM (SELECT DATE_SUB(DATE_ADD('2009-10-15', INTERVAL 1 MICROSECOND), INTERVAL 1 DAY_SECOND) AS f2 FROM t) AS t1; -- sql1 |
+----------------+ |
| f1 |
|
+----------------+ |
| 20091014235959 |
|
+----------------+ |
1 row in set, 1 warning (0.00 sec) |
|
|
mysql> SELECT PI()+~1&f2 AS f1 FROM (SELECT DISTINCT DATE_SUB(DATE_ADD('2009-10-15', INTERVAL 1 MICROSECOND), INTERVAL 1 DAY_SECOND) AS f2 FROM t) AS t1; -- sql2 |
+------+ |
| f1 |
|
+------+ |
| 2009 |
|
+------+ |
1 row in set, 2 warnings (0.00 sec) |
How to repeat:
drop table if exists t; |
CREATE TABLE t (c1 INT); |
INSERT INTO t VALUES (1); |
|
|
SELECT PI()+~1&f2 AS f1 FROM (SELECT DATE_SUB(DATE_ADD('2009-10-15', INTERVAL 1 MICROSECOND), INTERVAL 1 DAY_SECOND) AS f2 FROM t) AS t1; -- sql1 |
SELECT PI()+~1&f2 AS f1 FROM (SELECT DISTINCT DATE_SUB(DATE_ADD('2009-10-15', INTERVAL 1 MICROSECOND), INTERVAL 1 DAY_SECOND) AS f2 FROM t) AS t1; -- sql2 |
Hope these can be helpful for your debugging:
1. The bug cannot be reproduced after removing the date function (change to '2009-10-15' AS f2);
2. The bug cannot be reproduced after removing FROM t;
3. We look for the first version of the bug in all docker images (with format x.x.x) of https://hub.docker.com/_/mariadb/tags
We found that the bug first occurred in mariadb:5.5.62, it cannot be reproduced in mariadb:5.5.61:
MariaDB [TEST]> select version(); |
+-------------------------+ |
| version() |
|
+-------------------------+ |
| 5.5.62-MariaDB-1~trusty |
|
+-------------------------+ |
1 row in set (0.00 sec) |
|
|
MariaDB [TEST]> SELECT PI()+~1&f2 AS f1 FROM (SELECT DATE_SUB(DATE_ADD('2009-10-15', INTERVAL 1 MICROSECOND), INTERVAL 1 DAY_SECOND) AS f2 FROM t) AS t1; -- sql1 |
+----------------+ |
| f1 |
|
+----------------+ |
| 20091014235959 |
|
+----------------+ |
1 row in set (0.00 sec) |
|
|
MariaDB [TEST]> SELECT PI()+~1&f2 AS f1 FROM (SELECT DISTINCT DATE_SUB(DATE_ADD('2009-10-15', INTERVAL 1 MICROSECOND), INTERVAL 1 DAY_SECOND) AS f2 FROM t) AS t1; -- sql2 |
+------+ |
| f1 |
|
+------+ |
| 2009 |
|
+------+ |
1 row in set, 1 warning (0.00 sec) |
|
|
MariaDB [TEST]> select version(); |
+-------------------------+ |
| version() |
|
+-------------------------+ |
| 5.5.61-MariaDB-1~trusty |
|
+-------------------------+ |
1 row in set (0.00 sec) |
|
|
MariaDB [TEST]> SELECT PI()+~1&f2 AS f1 FROM (SELECT DATE_SUB(DATE_ADD('2009-10-15', INTERVAL 1 MICROSECOND), INTERVAL 1 DAY_SECOND) AS f2 FROM t) AS t1; -- sql1 |
+------+ |
| f1 |
|
+------+ |
| 0 |
|
+------+ |
1 row in set (0.00 sec) |
|
|
MariaDB [TEST]> SELECT PI()+~1&f2 AS f1 FROM (SELECT DISTINCT DATE_SUB(DATE_ADD('2009-10-15', INTERVAL 1 MICROSECOND), INTERVAL 1 DAY_SECOND) AS f2 FROM t) AS t1; -- sql2 |
+------+ |
| f1 |
|
+------+ |
| 0 |
|
+------+ |
1 row in set, 1 warning (0.00 sec) |
Attachments
Issue Links
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