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Bug#12891:

Browse Source 
UNION doesn't return DISTINCT result for multi-byte characters
hp_hash.c:
  This piece of code was pretty wrong, looks
  like no necessary changes were made after
  cut-and-paste from fixed length segment processing.
  Itroduced two new variables safe_length1 and
  safe_length2 to remember the original lengths.
  Fixing my_charpos and set_if_smaller calls
  to pass correct parameters.
ctype_utf8.result, ctype_utf8.test:
  adding test case


heap/hp_hash.c:
   Bug#12891:
  UNION doesn't return DISTINCT result for multi-byte characters
  This piece of code was pretty wrong.
mysql-test/t/ctype_utf8.test:
  adding test case
mysql-test/r/ctype_utf8.result:
  adding test case
This commit is contained in:
unknown
2005-09-01 19:31:08 +05:00
parent b5f8734487
commit 600b5fea57
3 changed files with 29 additions and 4 deletions
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10
heap/hp_hash.c
View File

@ -551,11 +551,13 @@ int hp_rec_key_cmp(HP_KEYDEF *keydef, const byte *rec1, const byte *rec2,
}
if (cs->mbmaxlen > 1)
{
uint safe_length1= char_length1;
uint safe_length2= char_length2;
uint char_length= seg->length / cs->mbmaxlen;
char_length1= my_charpos(cs, pos1, pos1 + char_length1, char_length1);
set_if_smaller(char_length1, seg->length);
char_length2= my_charpos(cs, pos2, pos2 + char_length2, char_length2);
set_if_smaller(char_length2, seg->length);
char_length1= my_charpos(cs, pos1, pos1 + char_length1, char_length);
set_if_smaller(char_length1, safe_length1);
char_length2= my_charpos(cs, pos2, pos2 + char_length2, char_length);
set_if_smaller(char_length2, safe_length2);
}
if (cs->coll->strnncollsp(seg->charset,

12
mysql-test/r/ctype_utf8.result
View File

@ -1023,3 +1023,15 @@ aa
xxx
yyy
DROP TABLE t1;
set names utf8;
create table t1 (a char(1)) default character set utf8;
create table t2 (a char(1)) default character set utf8;
insert into t1 values('a'),('a'),(0xE38182),(0xE38182);
insert into t1 values('i'),('i'),(0xE38184),(0xE38184);
select * from t1 union distinct select * from t2;
a
a
あ
i
い
drop table t1,t2;

11
mysql-test/t/ctype_utf8.test
View File

@ -857,3 +857,14 @@ SELECT DISTINCT id FROM t1;
SELECT DISTINCT id FROM t1 ORDER BY id;
DROP TABLE t1;
#
# Bug#12891: UNION doesn't return DISTINCT result for multi-byte characters
#
set names utf8;
create table t1 (a char(1)) default character set utf8;
create table t2 (a char(1)) default character set utf8;
insert into t1 values('a'),('a'),(0xE38182),(0xE38182);
insert into t1 values('i'),('i'),(0xE38184),(0xE38184);
select * from t1 union distinct select * from t2;
drop table t1,t2;