field length convertion (bytes->chars) should be done with rounding UP.

mysql-test/r/ctype_utf8.result

+drop table if exists t1;
 set names utf8;
 select left(_utf8 0xD0B0D0B1D0B2,1);
 left(_utf8 0xD0B0D0B1D0B2,1)
@@ -68,3 +69,13 @@ this	is a	test
 select insert("aa",100,1,"b"),insert("aa",1,3,"b");
 insert("aa",100,1,"b")	insert("aa",1,3,"b")
 aa	b
+create table t1 select date_format("2004-01-19 10:10:10", "%Y-%m-%d");
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `date_format("2004-01-19 10:10:10", "%Y-%m-%d")` char(4) character set utf8 default NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+select * from t1;
+date_format("2004-01-19 10:10:10", "%Y-%m-%d")
+2004-01-19
+drop table t1;

mysql-test/t/ctype_utf8.test

@@ -2,6 +2,9 @@
 # Tests with the utf8 character set
 #
 
+--disable_warnings
+drop table if exists t1;
+--enable_warnings
 set names utf8;
 
 select left(_utf8 0xD0B0D0B1D0B2,1);
@@ -41,3 +44,12 @@ select _utf8 0xD0B0D0B1D0B2 like concat(_utf8'%',_utf8 0xD0B1,_utf8 '%');
 #
 select insert('txs',2,1,'hi'),insert('is ',4,0,'a'),insert('txxxxt',2,4,'es');
 select insert("aa",100,1,"b"),insert("aa",1,3,"b");
+
+#
+# CREATE ... SELECT
+#
+create table t1 select date_format("2004-01-19 10:10:10", "%Y-%m-%d");
+show create table t1;
+select * from t1;
+drop table t1;
+

sql/field.cc

@@ -5611,11 +5611,11 @@ create_field::create_field(Field *old_field,Field *orig_field)
         case  3: sql_type= FIELD_TYPE_MEDIUM_BLOB; break;
         default: sql_type= FIELD_TYPE_LONG_BLOB; break;
       }
-      length /= charset->mbmaxlen;		// QQ: Probably not needed
+      length=(length+charset->mbmaxlen-1)/charset->mbmaxlen; // QQ: Probably not needed
       break;
     case FIELD_TYPE_STRING:
     case FIELD_TYPE_VAR_STRING:
-      length /= charset->mbmaxlen;
+      length=(length+charset->mbmaxlen-1)/charset->mbmaxlen;
       break;
     default:
       break;