Add Type_handler::Key_part_spec_init_ft

      if ((sql_field->real_field_type() != MYSQL_TYPE_STRING &&

           sql_field->real_field_type() != MYSQL_TYPE_VARCHAR &&

           !f_is_blob(sql_field->pack_flag)) ||

          sql_field->charset == &my_charset_bin ||

          sql_field->charset->mbminlen > 1 || // ucs2 doesn't work yet

          (ft_key_charset && sql_field->charset != ft_key_charset))

      {

          my_error(ER_BAD_FT_COLUMN, MYF(0), column->field_name.str);

          DBUG_RETURN(-1);

      }

      ft_key_charset=sql_field->charset;

      /*

        for fulltext keys keyseg length is 1 for blobs (it's ignored in ft

        code anyway, and 0 (set to column width later) for char's. it has

        to be correct col width for char's, as char data are not prefixed

        with length (unlike blobs, where ft code takes data length from a

        data prefix, ignoring column->length).

      */

       column->length= MY_TEST(f_is_blob(sql_field->pack_flag));

virtual bool Key_part_spec_init_ft(Key_part_spec *part,

                                   const Column_definition &def) const;