Affects Version/s: 10.0.4
Fix Version/s: 10.0.5
ADDTIME(expr1,expr2) is a hybrid function.
- In case when expr1 is DATETIME, the result type is DATETIME.
- In case when expr1 is TIME, the result type is TIME.
- Otherwise, the result type is VARCHAR, and the choice between
DATETIME or TIME format is done per-row.
In case of VARCHAR result, the function must follow the standard
character set and collation of a string function returning a result
from numeric or temporal input should be set according to
@@character_set_connection and @@collation_connection
In MySQL 5.6, implicit conversion of a numeric or temporal value to string produces a value that has a character set and collation determined by the character_set_connection and collation_connection system variables.
Consider this SQL script:
MySQL-5.6 does follow this rule, and the output is:
Notice: ucs2 is consistently reported in both tables in the output.
MariaDB does not follow this rule, and the output is:
Moreover, the result of CHARSET() and of "SHOW CREATE" do not
match to each over (binary vs latin1).
The same problem is observed with another temporal hybrid function DATE_ADD.
Results from MySQL-5.6 are consistently correct:
Result from MariaDB-10.0 are wrong and non-consistent: