bug #20910 (NOT NULL reported as NULL for TIMESTAMP)

we intentionally reported that for TIMESTAMPS, which isn't right

mysql-test/r/type_timestamp.result

@@ -201,9 +201,9 @@ t1	CREATE TABLE `t1` (
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 show columns from t1;
 Field	Type	Null	Key	Default	Extra
-t1	timestamp	YES		2003-01-01 00:00:00	
+t1	timestamp	NO		2003-01-01 00:00:00	
 t2	datetime	YES		NULL	
-t3	timestamp	YES		0000-00-00 00:00:00	
+t3	timestamp	NO		0000-00-00 00:00:00	
 drop table t1;
 create table t1 (t1 timestamp default now(), t2 datetime, t3 timestamp);
 SET TIMESTAMP=1000000002;
@@ -225,9 +225,9 @@ t1	CREATE TABLE `t1` (
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 show columns from t1;
 Field	Type	Null	Key	Default	Extra
-t1	timestamp	YES		CURRENT_TIMESTAMP	
+t1	timestamp	NO		CURRENT_TIMESTAMP	
 t2	datetime	YES		NULL	
-t3	timestamp	YES		0000-00-00 00:00:00	
+t3	timestamp	NO		0000-00-00 00:00:00	
 drop table t1;
 create table t1 (t1 timestamp default '2003-01-01 00:00:00' on update now(), t2 datetime);
 SET TIMESTAMP=1000000004;
@@ -251,7 +251,7 @@ t1	CREATE TABLE `t1` (
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 show columns from t1;
 Field	Type	Null	Key	Default	Extra
-t1	timestamp	YES		2003-01-01 00:00:00	
+t1	timestamp	NO		2003-01-01 00:00:00	
 t2	datetime	YES		NULL	
 drop table t1;
 create table t1 (t1 timestamp default now() on update now(), t2 datetime);
@@ -276,7 +276,7 @@ t1	CREATE TABLE `t1` (
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 show columns from t1;
 Field	Type	Null	Key	Default	Extra
-t1	timestamp	YES		CURRENT_TIMESTAMP	
+t1	timestamp	NO		CURRENT_TIMESTAMP	
 t2	datetime	YES		NULL	
 drop table t1;
 create table t1 (t1 timestamp, t2 datetime, t3 timestamp);
@@ -302,9 +302,9 @@ t1	CREATE TABLE `t1` (
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 show columns from t1;
 Field	Type	Null	Key	Default	Extra
-t1	timestamp	YES		CURRENT_TIMESTAMP	
+t1	timestamp	NO		CURRENT_TIMESTAMP	
 t2	datetime	YES		NULL	
-t3	timestamp	YES		0000-00-00 00:00:00	
+t3	timestamp	NO		0000-00-00 00:00:00	
 drop table t1;
 create table t1 (t1 timestamp default current_timestamp on update current_timestamp, t2 datetime);
 SET TIMESTAMP=1000000009;
@@ -328,7 +328,7 @@ t1	CREATE TABLE `t1` (
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 show columns from t1;
 Field	Type	Null	Key	Default	Extra
-t1	timestamp	YES		CURRENT_TIMESTAMP	
+t1	timestamp	NO		CURRENT_TIMESTAMP	
 t2	datetime	YES		NULL	
 delete from t1;
 insert into t1 values ('2004-04-01 00:00:00', '2004-04-01 00:00:00');
@@ -493,3 +493,18 @@ a	b	c
 6	NULL	2006-06-06 06:06:06
 drop table t1;
 set time_zone= @@global.time_zone;
+CREATE TABLE t1 (
+`id` int(11) NOT NULL auto_increment,
+`username` varchar(80) NOT NULL default '',
+`posted_on` timestamp NOT NULL default '0000-00-00 00:00:00',
+PRIMARY KEY (`id`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1;
+show fields from t1;
+Field	Type	Null	Key	Default	Extra
+id	int(11)	NO	PRI	NULL	auto_increment
+username	varchar(80)	NO			
+posted_on	timestamp	NO		0000-00-00 00:00:00	
+select is_nullable from INFORMATION_SCHEMA.COLUMNS where TABLE_NAME='t1' and COLUMN_NAME='posted_on';
+is_nullable
+NO
+drop table t1;

mysql-test/t/type_timestamp.test

@@ -328,3 +328,14 @@ drop table t1;
 
 # Restore timezone to default
 set time_zone= @@global.time_zone;
+
+CREATE TABLE t1 (
+`id` int(11) NOT NULL auto_increment,
+`username` varchar(80) NOT NULL default '',
+`posted_on` timestamp NOT NULL default '0000-00-00 00:00:00',
+PRIMARY KEY (`id`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1;
+
+show fields from t1;
+select is_nullable from INFORMATION_SCHEMA.COLUMNS where TABLE_NAME='t1' and COLUMN_NAME='posted_on';
+drop table t1;

sql/sql_show.cc

@@ -2713,9 +2713,7 @@ static int get_schema_column_record(THD *thd, struct st_table_list *tables,
       table->field[5]->store("",0, cs);
       table->field[5]->set_notnull();
     }
-    pos=(byte*) ((flags & NOT_NULL_FLAG) &&
-                 field->type() != FIELD_TYPE_TIMESTAMP ?
-                 "NO" : "YES");
+    pos=(byte*) ((flags & NOT_NULL_FLAG) ?  "NO" : "YES");
     table->field[6]->store((const char*) pos,
                            strlen((const char*) pos), cs);
     is_blob= (field->type() == FIELD_TYPE_BLOB);