Commit ae0acc84 authored by unknown's avatar unknown
Browse files

Bug #6019 SELECT tries to use too short prefix index on utf8 data

parent a5484c0c

mysql-test/r/ctype_utf8.result

+11 −0
Original line number Diff line number Diff line
@@ -779,3 +779,14 @@ id term 
2	testetest

3	testtest

DROP TABLE t1;

set names utf8;

create table t1 (

a int primary key,

b varchar(6),

index b3(b(3))

) engine=myisam character set=utf8;

insert into t1 values(1,'foo'),(2,'foobar');

select * from t1 where b like 'foob%';

a	b

2	foobar

drop table t1;

mysql-test/t/ctype_utf8.test

+15 −0
Original line number Diff line number Diff line
@@ -620,3 +620,18 @@ SELECT id, term FROM t1 where (list_id = 1) AND (term = "test 
SELECT id, term FROM t1 where (list_id = 1) AND (term = "testetest");

SELECT id, term FROM t1 where (list_id = 1) AND (term = "testtest");

DROP TABLE t1;



#

# Bug #6019 SELECT tries to use too short prefix index on utf8 data

#

set names utf8;

--disable_warnings

create table t1 (

  a int primary key,

  b varchar(6),

  index b3(b(3))

) engine=myisam character set=utf8;

--enable_warnings

insert into t1 values(1,'foo'),(2,'foobar');

select * from t1 where b like 'foob%';

drop table t1;

strings/ctype-mb.c

+4 −0
Original line number Diff line number Diff line
@@ -499,6 +499,10 @@ my_bool my_like_range_mb(CHARSET_INFO *cs, 
    {

      char buf[10];

      uint buflen;

      uint charlen= my_charpos(cs, min_org, min_str, res_length/cs->mbmaxlen);

      

      if (charlen < (uint) (min_str - min_org))

        min_str= min_org + charlen;

      

      /* Write min key  */

      *min_length= (uint) (min_str - min_org);

strings/ctype-utf8.c

+2 −2
Original line number Diff line number Diff line
@@ -2059,7 +2059,7 @@ static MY_COLLATION_HANDLER my_collation_ci_handler = 
    my_strnncoll_utf8,

    my_strnncollsp_utf8,

    my_strnxfrm_utf8,

    my_like_range_simple,

    my_like_range_mb,

    my_wildcmp_mb,

    my_strcasecmp_utf8,

    my_instr_mb,
@@ -2119,7 +2119,7 @@ CHARSET_INFO my_charset_utf8_general_ci= 
    1,                  /* mbminlen     */

    3,                  /* mbmaxlen     */

    0,                  /* min_sort_char */

    255,                /* max_sort_char */

    0xFFFF,             /* max_sort_char */

    &my_charset_utf8_handler,

    &my_collation_ci_handler

};