4 files changed, 103 insertions, 16 deletions
diff --git a/mysql-test/r/auto_increment.result b/mysql-test/r/auto_increment.result
index f5ec5f1f852..428b2769fdb 100644
--- a/mysql-test/r/auto_increment.result
+++ b/mysql-test/r/auto_increment.result
@@ -289,3 +289,55 @@ a	b
 0	13
 500	14
 drop table t1;
+create table t1 (a bigint);
+insert into t1 values (1), (2), (3), (NULL), (NULL);
+alter table t1 modify a bigint not null auto_increment primary key;
+select * from t1;
+a
+1
+2
+3
+4
+5
+drop table t1;
+create table t1 (a bigint);
+insert into t1 values (1), (2), (3), (0), (0);
+alter table t1 modify a bigint not null auto_increment primary key;
+select * from t1;
+a
+1
+2
+3
+4
+5
+drop table t1;
+create table t1 (a bigint);
+insert into t1 values (0), (1), (2), (3);
+set sql_mode=NO_AUTO_VALUE_ON_ZERO;
+alter table t1 modify a bigint not null auto_increment primary key;
+set sql_mode= '';
+select * from t1;
+a
+0
+1
+2
+3
+drop table t1;
+create table t1 (a int auto_increment primary key , b int null);
+set sql_mode=NO_AUTO_VALUE_ON_ZERO;
+insert into t1 values (0,1),(1,2),(2,3);
+select * from t1;
+a	b
+0	1
+1	2
+2	3
+set sql_mode= '';
+alter table t1 modify b varchar(255);
+insert into t1 values (0,4);
+select * from t1;
+a	b
+0	1
+1	2
+2	3
+3	4
+drop table t1;
diff --git a/mysql-test/r/type_timestamp.result b/mysql-test/r/type_timestamp.result
index 4dd94b26a73..42fdc7e50c6 100644
--- a/mysql-test/r/type_timestamp.result
+++ b/mysql-test/r/type_timestamp.result
@@ -405,17 +405,14 @@ a	b
 NULL	NULL
 NULL	2003-01-01 00:00:00
 drop table t1;
-create table t1 (ts timestamp(19));
-show create table t1;
-Table	Create Table
-t1	CREATE TABLE `t1` (
-  `ts` timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP
-) ENGINE=MyISAM DEFAULT CHARSET=latin1
-set TIMESTAMP=1000000000;
-insert into t1 values ();
+create table t1 (a bigint, b bigint);
+insert into t1 values (NULL, NULL), (20030101000000, 20030102000000);
+set timestamp=1000000019;
+alter table t1 modify a timestamp, modify b timestamp;
 select * from t1;
-ts
-2001-09-09 04:46:40
+a	b
+2001-09-09 04:46:59	2001-09-09 04:46:59
+2003-01-01 00:00:00	2003-01-02 00:00:00
 drop table t1;
 create table t1 (a char(2), t timestamp);
 insert into t1 values ('a', '2004-01-01 00:00:00'), ('a', '2004-01-01 01:00:00'),
diff --git a/mysql-test/t/auto_increment.test b/mysql-test/t/auto_increment.test
index e5986e6755d..8e11a3d68a5 100644
--- a/mysql-test/t/auto_increment.test
+++ b/mysql-test/t/auto_increment.test
@@ -168,3 +168,41 @@ update t1 set a=NULL where b=13;
 update t1 set a=500 where b=14;
 select * from t1 order by b;
 drop table t1;
+
+#
+# Test of behavior of ALTER TABLE when coulmn containing NULL or zeroes is
+# converted to AUTO_INCREMENT column
+#
+create table t1 (a bigint);
+insert into t1 values (1), (2), (3), (NULL), (NULL);
+alter table t1 modify a bigint not null auto_increment primary key; 
+select * from t1;
+drop table t1;
+
+create table t1 (a bigint);
+insert into t1 values (1), (2), (3), (0), (0);
+alter table t1 modify a bigint not null auto_increment primary key; 
+select * from t1;
+drop table t1;
+
+# We still should be able to preserve zero in NO_AUTO_VALUE_ON_ZERO mode
+create table t1 (a bigint);
+insert into t1 values (0), (1), (2), (3);
+set sql_mode=NO_AUTO_VALUE_ON_ZERO;
+alter table t1 modify a bigint not null auto_increment primary key; 
+set sql_mode= '';
+select * from t1;
+drop table t1;
+
+# It also sensible to preserve zeroes if we are converting auto_increment
+# column to auto_increment column (or not touching it at all, which is more
+# common case probably)
+create table t1 (a int auto_increment primary key , b int null);
+set sql_mode=NO_AUTO_VALUE_ON_ZERO;
+insert into t1 values (0,1),(1,2),(2,3);
+select * from t1;
+set sql_mode= '';
+alter table t1 modify b varchar(255);
+insert into t1 values (0,4);
+select * from t1;
+drop table t1;
diff --git a/mysql-test/t/type_timestamp.test b/mysql-test/t/type_timestamp.test
index 5978c24ddc4..a8a0cf8703c 100644
--- a/mysql-test/t/type_timestamp.test
+++ b/mysql-test/t/type_timestamp.test
@@ -267,13 +267,13 @@ select * from t1;
 drop table t1;
 
 #
-# Test for bug #4491, TIMESTAMP(19) should be possible to create and not
-# only read in 4.0
+# Let us test behavior of ALTER TABLE when it converts columns 
+# containing NULL to TIMESTAMP columns.
 #
-create table t1 (ts timestamp(19));
-show create table t1;
-set TIMESTAMP=1000000000;
-insert into t1 values ();
+create table t1 (a bigint, b bigint);
+insert into t1 values (NULL, NULL), (20030101000000, 20030102000000);
+set timestamp=1000000019;
+alter table t1 modify a timestamp, modify b timestamp;
 select * from t1;
 drop table t1;