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Fix for bug #20709: Collation not used in group by on 4.1.

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myisam/mi_uniue.c:mi_check_unique() should skip trailing spaces comparing 
TEXT and VARTTEXT key segments.
This commit is contained in:
ramil/ram@mysql.com/myoffice.izhnet.ru 2006-08-10 15:06:22 +05:00
parent 8e4460343f
commit 50ae5b7989
3 changed files with 31 additions and 1 deletions
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2
myisam/mi_unique.c
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@ -185,7 +185,7 @@ int mi_unique_comp(MI_UNIQUEDEF *def, const byte *a, const byte *b,
if (type == HA_KEYTYPE_TEXT || type == HA_KEYTYPE_VARTEXT)
{
if (mi_compare_text(keyseg->charset, (uchar *) pos_a, length,
(uchar *) pos_b, length, 0, 0))
(uchar *) pos_b, length, 0, 1))
return 1;
}
else

16
mysql-test/r/ctype_utf8.result
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@ -1293,3 +1293,19 @@ id tid val
42749 72 VOLNİ ADSL
44205 72 VOLNİ ADSL
DROP TABLE t1;
create table t1(a char(200) collate utf8_unicode_ci NOT NULL default '')
default charset=utf8 collate=utf8_unicode_ci;
insert into t1 values (unhex('65')), (unhex('C3A9')), (unhex('65'));
explain select distinct a from t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using temporary
select distinct a from t1;
a
e
explain select a from t1 group by a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using temporary; Using filesort
select a from t1 group by a;
a
e
drop table t1;

14
mysql-test/t/ctype_utf8.test
View File

@ -1040,4 +1040,18 @@ ALTER TABLE t1 ADD KEY idx (tid,val(11));
SELECT * FROM t1 WHERE tid=72 and val LIKE 'VOLNÝ ADSL';
DROP TABLE t1;
#
# Bug 20709: problem with utf8 fields in temporary tables
#
create table t1(a char(200) collate utf8_unicode_ci NOT NULL default '')
default charset=utf8 collate=utf8_unicode_ci;
insert into t1 values (unhex('65')), (unhex('C3A9')), (unhex('65'));
explain select distinct a from t1;
select distinct a from t1;
explain select a from t1 group by a;
select a from t1 group by a;
drop table t1;
# End of 4.1 tests