Fixed conv function max_ length bug #380
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The max_length of the conv function is 64 bytes. In a multi-byte characters, the result may be truncated.
For example:
set names utf8mb4;
drop table if exists test;
create table test(id varchar(10));
insert into test values('abcdef');
correct result:
mysql> select conv(id, 16, 2) id from test;
+--------------------------+
| id |
+--------------------------+
| 101010111100110111101111 |
+--------------------------+
1 row in set (0.00 sec)
truncated:
mysql> select conv(id, 16, 2) id from test group by id;
+------------------+
| id |
+------------------+
| 1010101111001101 |
+------------------+
1 row in set, 1 warning (0.00 sec)
mysql> create table tmp select conv(id, 16, 2) id from test;
ERROR 1406 (22001): Data too long for column 'id' at row 1