of client equals to character set of connection, possibly required
conversion to character set of column is not performed
(prepared statements, data is supplied using placeholders).


sql/item.cc:
  Fix for the bug reported by Reggie: if character_set_connection
  is equal to character_set_client, placeholder's value is not converted
  furhter to character set of column when it's different.
  This is because the original implementation left placeholder's character
  set intact (binary) if there were no need for client->connection conversion.
tests/client_test.c:
  A test case for the conversion bug.