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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.


mysql-test/r/func_gconcat.result:
  Adding test case
mysql-test/t/func_gconcat.test:
  Adding test case
sql/item_sum.cc:
  Adding well_formed_len() call not to cut
      in the middle of a multi-byte character.
This commit is contained in:
unknown
2006-11-07 12:45:48 +04:00
parent 2ab335a5b8
commit d9360eae3b
3 changed files with 102 additions and 4 deletions
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62
mysql-test/r/func_gconcat.result
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@ -599,12 +599,72 @@ count(distinct (f1+1))
1
3
drop table t1;
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);
set group_concat_max_len= 1022 + 10;
select @x:=group_concat(x) from t1 group by y;
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
1032 1031 1027 aaaaaaa,÷÷÷÷ C3B7C3B7C3B7
set group_concat_max_len= 1022 + 9;
select @x:=group_concat(x) from t1 group by y;
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
1031 1031 1027 aaaaaaa,÷÷÷÷ C3B7C3B7C3B7
set group_concat_max_len= 1022 + 8;
select @x:=group_concat(x) from t1 group by y;
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
1030 1029 1026 aaaaaaaa,÷÷÷ C3B7C3B7C3B7
set group_concat_max_len= 1022 + 7;
select @x:=group_concat(x) from t1 group by y;
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
1029 1029 1026 aaaaaaaa,÷÷÷ C3B7C3B7C3B7
set group_concat_max_len= 1022 + 6;
select @x:=group_concat(x) from t1 group by y;
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
1028 1027 1025 aaaaaaaaa,÷÷ 612CC3B7C3B7
set group_concat_max_len= 1022 + 5;
select @x:=group_concat(x) from t1 group by y;
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
1027 1027 1025 aaaaaaaaa,÷÷ 612CC3B7C3B7
set group_concat_max_len= 1022 + 4;
select @x:=group_concat(x) from t1 group by y;
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
1026 1025 1024 aaaaaaaaaa,÷ 6161612CC3B7
set group_concat_max_len= 1022 + 3;
select @x:=group_concat(x) from t1 group by y;
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
1025 1025 1024 aaaaaaaaaa,÷ 6161612CC3B7
set group_concat_max_len= 1022 + 2;
select @x:=group_concat(x) from t1 group by y;
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
1024 1023 1023 aaaaaaaaaaa, 61616161612C
set group_concat_max_len= 1022 + 1;
select @x:=group_concat(x) from t1 group by y;
select @@group_concat_max_len, length(@x), char_length(@x), right(@x,12), right(HEX(@x),12);
@@group_concat_max_len length(@x) char_length(@x) right(@x,12) right(HEX(@x),12)
1023 1023 1023 aaaaaaaaaaa, 61616161612C
drop table t1;
set group_concat_max_len=1024;
set names latin1;
create table t1 (f1 int unsigned, f2 varchar(255));
insert into t1 values (1,repeat('a',255)),(2,repeat('b',255));
select f2,group_concat(f1) from t1 group by f2;
Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
def test t1 t1 f2 f2 253 255 255 Y 0 0 8
def group_concat(f1) 252 400 1 Y 128 0 63
def group_concat(f1) 252 1024 1 Y 128 0 63
f2 group_concat(f1)
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 1
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb 2