BUG#9535 Warning for "create table t as select uuid();"

 - Set max_length of Item_func_uuid to max_length*system_charset_info->mbmaxlen
  Note! Item_func_uuid should be set to use 'ascii' charset when hex(), format(), md5() etc will use 'ascii'

mysql-test/r/func_misc.result

@@ -51,3 +51,11 @@ select a from t1 where mid(a+0,6,3) = ( mid(20040106123400,6,3) );
 a
 2004-01-06 12:34:00
 drop table t1;
+create table t1 as select uuid(), length(uuid());
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `uuid()` varchar(36) character set utf8 NOT NULL default '',
+  `length(uuid())` int(10) NOT NULL default '0'
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+drop table t1;

mysql-test/t/func_misc.test

@@ -38,3 +38,11 @@ select a from t1 where mid(a+0,6,3) = ( mid(20040106123400,6,3) );
 
 drop table t1;
 
+# Test for BUG#9535
+create table t1 as select uuid(), length(uuid());
+show create table t1;
+drop table t1;
+
+
+
+

sql/item_strfunc.h

@@ -727,7 +727,12 @@ public:
   Item_func_uuid(): Item_str_func() {}
   void fix_length_and_dec() {
     collation.set(system_charset_info);
-    max_length= UUID_LENGTH;
+    /*
+       NOTE! uuid() should be changed to use 'ascii'
+       charset when hex(), format(), md5(), etc, and implicit
+       number-to-string conversion will use 'ascii'
+    */
+    max_length= UUID_LENGTH * system_charset_info->mbmaxlen;
   }
   const char *func_name() const{ return "uuid"; }
   String *val_str(String *);