Bug #31758 inet_ntoa, oct crashes server with null+filesort

Item_func_inet_ntoa and Item_func_conv inherit 'maybe_null' flag from an
argument, which is wrong.
Both can be NULL with notnull arguments, so that's fixed.


mysql-test/r/func_str.result:
  Bug #31758 inet_ntoa, oct crashes server with null+filesort
  
  test case
mysql-test/t/func_str.test:
  Bug #31758 inet_ntoa, oct crashes server with null+filesort
  
  test result
sql/item_strfunc.h:
  Bug #31758 inet_ntoa, oct crashes server with null+filesort
  
  missing maybe_null flags set for Item_func_inet_ntoa and Item_func_conv

1 files changed, 15 insertions, 3 deletions

diff --git a/mysql-test/r/func_str.result b/mysql-test/r/func_str.result
index af6a4d20cff..3a429765c98 100644
--- a/mysql-test/r/func_str.result
+++ b/mysql-test/r/func_str.result
@@ -711,9 +711,9 @@ 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)` char(64) NOT NULL default '',
-  `oct(130)` char(64) NOT NULL default '',
-  `conv(130,16,10)` char(64) NOT NULL default '',
+  `bin(130)` char(64) default NULL,
+  `oct(130)` char(64) default NULL,
+  `conv(130,16,10)` char(64) default NULL,
   `hex(130)` char(6) NOT NULL default '',
   `char(130)` char(1) NOT NULL default '',
   `format(130,10)` char(4) NOT NULL default '',
@@ -1076,4 +1076,16 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 Warnings:
 Note	1003	select decode(test.t1.f1,'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