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Bug#23451 GROUP_CONCAT truncates a multibyte utf8 character

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Problem: GROUP_CONCAT on a multi-byte column can truncate
  in the middle of a multibyte character when applying
  group_concat_max_len limit. It produces an invalid
  multi-byte character in the result string.
  
The second, easier version - reusing old "warning_for_row" flag,
instead of introducing of "result_is_full" - which was
added in the previous commit.
This commit is contained in:
bar@mysql.com/bar.intranet.mysql.r18.ru
2006-11-07 12:45:48 +04:00
parent 31abddb5e1
commit 599b731660
3 changed files with 102 additions and 4 deletions
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24
mysql-test/t/func_gconcat.test
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@@ -390,6 +390,30 @@ select f1, group_concat(f1+1) from t1 group by f1 with rollup;
select count(distinct (f1+1)) from t1 group by f1 with rollup;
drop table t1;
#
# Bug#23451 GROUP_CONCAT truncates a multibyte utf8 character
#
set names utf8;
create table t1
(
x text character set utf8 not null,
y integer not null
);
insert into t1 values (repeat('a', 1022), 0), (repeat(_utf8 0xc3b7, 4), 0);
let $1= 10;
while ($1)
{
eval set group_concat_max_len= 1022 + $1;
--disable_result_log
select @x:=group_concat(x) from t1 group by y;
--enable_result_log
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
dec $1;
}
drop table t1;
set group_concat_max_len=1024;
set names latin1;
#
# Bug#14169 type of group_concat() result changed to blob if tmp_table was used
#