Merge mysql.com:/usr/home/bar/mysql-4.1

into  mysql.com:/usr/home/bar/mysql-4.1.b9509

mysql-test/r/ctype_utf8.result

@@ -924,6 +924,37 @@ NULL
 select ifnull(NULL, _utf8'string');
 ifnull(NULL, _utf8'string')
 string
+set names utf8;
+create table t1 (s1 char(5) character set utf8 collate utf8_lithuanian_ci);
+insert into t1 values ('I'),('K'),('Y');
+select * from t1 where s1 < 'K' and s1 = 'Y';
+s1
+I
+Y
+select * from t1 where 'K' > s1 and s1 = 'Y';
+s1
+I
+Y
+drop table t1;
+create table t1 (s1 char(5) character set utf8 collate utf8_czech_ci);
+insert into t1 values ('c'),('d'),('h'),('ch'),('CH'),('cH'),('Ch'),('i');
+select * from t1 where s1 > 'd' and s1 = 'CH';
+s1
+ch
+CH
+Ch
+select * from t1 where 'd' < s1 and s1 = 'CH';
+s1
+ch
+CH
+Ch
+select * from t1 where s1 = 'cH' and s1 <> 'ch';
+s1
+cH
+select * from t1 where 'cH' = s1 and s1 <> 'ch';
+s1
+cH
+drop table t1;
 create table t1 (a varchar(255)) default character set utf8;
 insert into t1 values (1.0);
 drop table t1;

mysql-test/t/ctype_utf8.test

@@ -727,6 +727,24 @@ drop table t1;
 select repeat(_utf8'+',3) as h union select NULL;
 select ifnull(NULL, _utf8'string');
 
+#
+# Bug#9509 Optimizer: wrong result after AND with comparisons
+#
+set names utf8;
+create table t1 (s1 char(5) character set utf8 collate utf8_lithuanian_ci);
+insert into t1 values ('I'),('K'),('Y');
+select * from t1 where s1 < 'K' and s1 = 'Y';
+select * from t1 where 'K' > s1 and s1 = 'Y';
+drop table t1;
+
+create table t1 (s1 char(5) character set utf8 collate utf8_czech_ci);
+insert into t1 values ('c'),('d'),('h'),('ch'),('CH'),('cH'),('Ch'),('i');
+select * from t1 where s1 > 'd' and s1 = 'CH';
+select * from t1 where 'd' < s1 and s1 = 'CH';
+select * from t1 where s1 = 'cH' and s1 <> 'ch';
+select * from t1 where 'cH' = s1 and s1 <> 'ch';
+drop table t1;
+
 #
 # Bug#10714: Inserting double value into utf8 column crashes server
 #

sql/sql_select.cc

@@ -4549,6 +4549,8 @@ change_cond_ref_to_const(THD *thd, I_List<COND_CMP> *save_list,
        left_item->collation.collation == value->collation.collation))
   {
     Item *tmp=value->new_item();
+    tmp->collation.set(right_item->collation);
+    
     if (tmp)
     {
       thd->change_item_tree(args + 1, tmp);
@@ -4570,6 +4572,8 @@ change_cond_ref_to_const(THD *thd, I_List<COND_CMP> *save_list,
             right_item->collation.collation == value->collation.collation))
   {
     Item *tmp=value->new_item();
+    tmp->collation.set(left_item->collation);
+    
     if (tmp)
     {
       thd->change_item_tree(args, tmp);