CSC issue # 3299 fix:

ENUM and SET type didn't compute their length correctly.
That showed up for example while converting into a CHAR column.

mysql-test/r/ctype_utf8.result

 drop table if exists t1;
+drop table if exists t2;
 set names utf8;
 select left(_utf8 0xD0B0D0B1D0B2,1);
 left(_utf8 0xD0B0D0B1D0B2,1)
@@ -246,6 +247,28 @@ select 'zвасяz' rlike '[[:<:]]вася[[:>:]]';
 CREATE TABLE t1 (a enum ('Y', 'N') DEFAULT 'N' COLLATE utf8_unicode_ci);
 ALTER TABLE t1 ADD COLUMN b CHAR(20);
 DROP TABLE t1;
+set names utf8;
+create table t1 (a enum('aaaa','проба') character set utf8);
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` enum('aaaa','проба') character set utf8 default NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+insert into t1 values ('проба');
+select * from t1;
+a
+проба
+create table t2 select ifnull(a,a) from t1;
+show create table t2;
+Table	Create Table
+t2	CREATE TABLE `t2` (
+  `ifnull(a,a)` char(5) character set utf8 default NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+select * from t2;
+ifnull(a,a)
+проба
+drop table t1;
+drop table t2;
 create table t1 (c varchar(30) character set utf8, unique(c(10)));
 insert into t1 values ('1'),('2'),('3'),('x'),('y'),('z');
 insert into t1 values ('aaaaaaaaaa');

mysql-test/t/ctype_utf8.test

@@ -4,6 +4,7 @@
 
 --disable_warnings
 drop table if exists t1;
+drop table if exists t2;
 --enable_warnings
 set names utf8;
 
@@ -172,6 +173,20 @@ CREATE TABLE t1 (a enum ('Y', 'N') DEFAULT 'N' COLLATE utf8_unicode_ci);
 ALTER TABLE t1 ADD COLUMN b CHAR(20);
 DROP TABLE t1;
 
+# Customer Support Center issue # 3299 
+# ENUM and SET multibyte fields computed their length wronly 
+# when converted into a char field
+set names utf8;
+create table t1 (a enum('aaaa','проба') character set utf8);
+show create table t1;
+insert into t1 values ('проба');
+select * from t1;
+create table t2 select ifnull(a,a) from t1;
+show create table t2;
+select * from t2;
+drop table t1;
+drop table t2;
+
 #
 # Bug 4521: unique key prefix interacts poorly with utf8
 # Check keys with prefix compression
@@ -220,3 +235,4 @@ insert into t1 values ('ꪪꪪ');
 --error 1062
 insert into t1 values ('ꪪꪪꪪ');
 drop table t1;
+

sql/field.cc

@@ -5667,6 +5667,10 @@ void create_field::create_length_to_internal_length(void)
       pack_length= calc_pack_length(sql_type == FIELD_TYPE_VAR_STRING ?
 				    FIELD_TYPE_STRING : sql_type, length);
       break;
+    case MYSQL_TYPE_ENUM:
+    case MYSQL_TYPE_SET:
+      length*= charset->mbmaxlen;
+      break;
     default:
       /* do nothing */
       break;

sql/sql_parse.cc

@@ -4381,7 +4381,10 @@ bool add_field_to_list(THD *thd, char *field_name, enum_field_types type,
       new_field->length=0;
       for (const char **pos=interval->type_names; *pos ; pos++)
       {
-	new_field->length+=(uint) strip_sp((char*) *pos)+1;
+        uint length= (uint) strip_sp((char*) *pos)+1;
+        CHARSET_INFO *cs= thd->variables.character_set_client;
+        length= cs->cset->numchars(cs, *pos, *pos+length);
+        new_field->length+= length;
       }
       new_field->length--;
       set_if_smaller(new_field->length,MAX_FIELD_WIDTH-1);
@@ -4411,8 +4414,10 @@ bool add_field_to_list(THD *thd, char *field_name, enum_field_types type,
       new_field->length=(uint) strip_sp((char*) interval->type_names[0]);
       for (const char **pos=interval->type_names+1; *pos ; pos++)
       {
-	uint length=(uint) strip_sp((char*) *pos);
-	set_if_bigger(new_field->length,length);
+        uint length=(uint) strip_sp((char*) *pos);
+        CHARSET_INFO *cs= thd->variables.character_set_client;
+        length= cs->cset->numchars(cs, *pos, *pos+length);
+        set_if_bigger(new_field->length,length);
       }
       set_if_smaller(new_field->length,MAX_FIELD_WIDTH-1);
       if (default_value)