Bug #44367 valgrind warnings with find_in_set() functions

Description:
find_in_set function produces warnings like:
Conditional jump or move depends on uninitialised value(s)

in function Item_func_find_in_set::val_int() (item_func.cc:2750)

See file attached for full outputs.

How to repeat:
drop table if exists `test`;
create table `test` (`col5` set('test1','test2','test3') character set utf8 default null) engine=myisam default charset=latin1;
insert into `test` values (''),(null),(null),(''),(''),('');
select find_in_set(col5,col5) as a from t1,(select find_in_set(col5,col5) as b from t1) a ;
select find_in_set(col5,col5) as a from t1,(select find_in_set(col5,col5) as b from t1) a order by a ;

oops, proper testcase s/t1/test/ :
-------------------------------

drop table if exists `test`;
create table `test` (`col5` set('test1','test2','test3') character set utf8 default null) engine=myisam default charset=latin1;
insert into `test` values (''),(null),(null),(''),(''),('');
select find_in_set(col5,col5) as a from test,(select find_in_set(col5,col5) as b from test) a;
select find_in_set(col5,col5) as a from test,(select find_in_set(col5,col5) as b from test) a order by a ;

valgrind outputs

Attachment: bug44367_valgrind_warnings_5.1.35.txt (text/plain), 8.57 KiB.

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/commits/72544

2861 Sergey Glukhov	2009-04-21
      Bug#44367 valgrind warnings with find_in_set() functions
       init 'wc' variable
     @ mysql-test/r/func_set.result
        test result
     @ mysql-test/t/func_set.test
        test case
     @ sql/item_func.cc
        init 'wc' variable

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/commits/72699

2866 Sergey Glukhov	2009-04-23
      Bug#44367 valgrind warnings with find_in_set() functions
      init 'wc' variable
     @ mysql-test/r/func_set.result
        test result
     @ mysql-test/t/func_set.test
        test case
     @ sql/item_func.cc
        init 'wc' variable

Pushed into 5.1.35 (revid:davi.arnaut@sun.com-20090505190206-9xmh7dlc6kom8exp) (version source revid:davi.arnaut@sun.com-20090505190206-9xmh7dlc6kom8exp) (merge vers: 5.1.35) (pib:6)

Pushed into 6.0.12-alpha (revid:svoj@sun.com-20090506125450-yokcmvqf2g7jhujq) (version source revid:sergey.glukhov@sun.com-20090423084237-j570b1umgk6tb4ha) (merge vers: 6.0.11-alpha) (pib:6)

Noted in 5.1.35, 6.0.12 changelogs.

Valgrind warnings for the DECODE(), ENCRYPT(), and FIND_IN_SET()
functions were corrected.

Pushed into 5.1.35-ndb-6.3.26 (revid:jonas@mysql.com-20090615074202-0r5r2jmi83tww6sf) (version source revid:jonas@mysql.com-20090615070837-9pccutgc7repvb4d) (merge vers: 5.1.35-ndb-6.3.26) (pib:6)

Pushed into 5.1.35-ndb-7.0.7 (revid:jonas@mysql.com-20090615074335-9hcltksp5cu5fucn) (version source revid:jonas@mysql.com-20090615072714-rmfkvrbbipd9r32c) (merge vers: 5.1.35-ndb-7.0.7) (pib:6)

Pushed into 5.1.35-ndb-6.2.19 (revid:jonas@mysql.com-20090615061520-sq7ds4yw299ggugm) (version source revid:jonas@mysql.com-20090615054654-ebgpz7elwu1xj36j) (merge vers: 5.1.35-ndb-6.2.19) (pib:6)