Merge bk@192.168.21.1:mysql-5.0-opt

into  mysql.com:/home/hf/work/31758/my50-31758

mysql-test/r/func_str.result

@@ -722,9 +722,9 @@ Warning	1265	Data truncated for column 'format(130,10)' at row 1
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
-  `bin(130)` varchar(64) NOT NULL default '',
-  `oct(130)` varchar(64) NOT NULL default '',
-  `conv(130,16,10)` varchar(64) NOT NULL default '',
+  `bin(130)` varchar(64) default NULL,
+  `oct(130)` varchar(64) default NULL,
+  `conv(130,16,10)` varchar(64) default NULL,
   `hex(130)` varchar(6) NOT NULL default '',
   `char(130)` varbinary(4) NOT NULL default '',
   `format(130,10)` varchar(4) NOT NULL default '',
@@ -1095,6 +1095,18 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	0	const row not found
 Warnings:
 Note	1003	select decode('','zxcv') AS `enc` from `test`.`t1`
+drop table t1;
+create table t1 (a bigint not null)engine=myisam;
+insert into t1 set a = 1024*1024*1024*4;
+delete from t1 order by (inet_ntoa(a)) desc limit 10;
+drop table t1;
+create table t1 (a char(36) not null)engine=myisam;
+insert ignore into t1 set a = ' ';
+insert ignore into t1 set a = ' ';
+select * from t1 order by (oct(a));
+a
+
+
 drop table t1;
 End of 4.1 tests
 create table t1 (d decimal default null);

mysql-test/t/func_str.test

@@ -738,6 +738,19 @@ explain extended select encode(f1,'zxcv') as 'enc' from t1;
 explain extended select decode(f1,'zxcv') as 'enc' from t1;
 drop table t1;
 
+#
+# Bug #31758 inet_ntoa, oct, crashes server with null + filesort 
+#
+create table t1 (a bigint not null)engine=myisam;
+insert into t1 set a = 1024*1024*1024*4;
+delete from t1 order by (inet_ntoa(a)) desc limit 10;
+drop table t1;
+create table t1 (a char(36) not null)engine=myisam;
+insert ignore into t1 set a = ' ';
+insert ignore into t1 set a = ' ';
+select * from t1 order by (oct(a));
+drop table t1;
+
 --echo End of 4.1 tests
 
 #

sql/item_strfunc.h

@@ -584,7 +584,8 @@ class Item_func_conv :public Item_str_func
   void fix_length_and_dec()
   {
     collation.set(default_charset());
-    max_length= 64;
+    max_length=64;
+    maybe_null= 1;
   }
 };
 
@@ -682,7 +683,7 @@ class Item_func_inet_ntoa : public Item_str_func
     }
   String* val_str(String* str);
   const char *func_name() const { return "inet_ntoa"; }
-  void fix_length_and_dec() { decimals = 0; max_length=3*8+7; }
+  void fix_length_and_dec() { decimals = 0; max_length=3*8+7; maybe_null=1;}
 };
 
 class Item_func_quote :public Item_str_func