bit_length function error

[DinoZhang]

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bit_length function error

MySQL [(none)]> select bit_length("abc");
ERROR 1064 (HY000): errCode = 2, detailMessage = No matching function with signature: bit_length(varchar(-1)).

in mysql

mysql> select bit_length("abc");
+-------------------+
| bit_length('abc') |
+-------------------+
|                24 |
+-------------------+
1 row in set (0.01 sec)