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Description
STR_TO_DATE returns NULL with a warning in case of a correct input
in combination with ucs2, utf16, utf16le, or utf32:
MySQL [test]> set character_set_connection=ucs2; select str_to_date('2001-01-01','%Y-%m-%d');show warnings;
Query OK, 0 rows affected (0.00 sec)
+--------------------------------------+
| str_to_date('2001-01-01','%Y-%m-%d') |
+--------------------------------------+
| NULL |
+--------------------------------------+
1 row in set, 1 warning (0.00 sec)
+---------+------+-------------------------------------------------------+
| Level | Code | Message |
+---------+------+-------------------------------------------------------+
| Warning | 1411 | Incorrect datetime value: '' for function str_to_date |
+---------+------+-------------------------------------------------------+
1 row in set (0.00 sec)
The expected result is: 2001-01-01.
Note, MySQL-5.6 demonstrates the same problem.
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Pushed into 5.3, 5.5, 10.0-base.