create database if not exists test;
 use test;
 DROP TABLE IF EXISTS select_tab;
 CREATE TABLE `select_tab` (
   `pk` bigint(11) NOT NULL AUTO_INCREMENT,
   `year_test` year(4) DEFAULT NULL,
   PRIMARY KEY (`pk`),
   KEY `index_year_test` (`year_test`)
 ) ENGINE=InnoDB AUTO_INCREMENT=1001 DEFAULT CHARSET=gbk ROW_FORMAT=DYNAMIC;
 show create table select_tab\G
 insert into  select_tab  (pk , year_test) values(1,2014);
 select count(*) FROM select_tab  where year_test < 2155;
 select count(*) FROM select_tab  where year_test < 2156;
 
 ALTER TABLE select_tab engine=myisam;
 show create table select_tab\G
 select count(*) FROM select_tab  where year_test < 2155;
 select count(*) FROM select_tab  where year_test < 2156;
 
 
 ## 5.1.77, 5.5.59 -- not affected
 
 [umshastr@hod03]/export/umesh/server/binaries/GABuilds/mysql-5.1.77: bin/mysql -uroot -S /tmp/mysql_ushastry.sock
 Welcome to the MySQL monitor.  Commands end with ; or \g.
 Your MySQL connection id is 1
 Server version: 5.1.77 Source distribution
 
 Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
 
 Oracle is a registered trademark of Oracle Corporation and/or its
 affiliates. Other names may be trademarks of their respective
 owners.
 
 Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
 
 mysql>  create database if not exists test;
 Query OK, 1 row affected, 1 warning (0.00 sec)
 
 mysql>  use test;
 Database changed
 mysql>  DROP TABLE IF EXISTS select_tab;
 Query OK, 0 rows affected, 1 warning (0.00 sec)
 
 mysql>  CREATE TABLE `select_tab` (
     ->    `pk` bigint(11) NOT NULL AUTO_INCREMENT,
     ->    `year_test` year(4) DEFAULT NULL,
     ->    PRIMARY KEY (`pk`),
     ->    KEY `index_year_test` (`year_test`)
     ->  ) ENGINE=InnoDB AUTO_INCREMENT=1001 DEFAULT CHARSET=gbk ROW_FORMAT=DYNAMIC;
 Query OK, 0 rows affected (0.00 sec)
 
 mysql>  show create table select_tab\G
 *************************** 1. row ***************************
        Table: select_tab
 Create Table: CREATE TABLE `select_tab` (
   `pk` bigint(11) NOT NULL AUTO_INCREMENT,
   `year_test` year(4) DEFAULT NULL,
   PRIMARY KEY (`pk`),
   KEY `index_year_test` (`year_test`)
 ) ENGINE=InnoDB AUTO_INCREMENT=1001 DEFAULT CHARSET=gbk ROW_FORMAT=DYNAMIC
 1 row in set (0.00 sec)
 
 mysql>  insert into  select_tab  (pk , year_test) values(1,2014);
 Query OK, 1 row affected (0.00 sec)
 
 mysql>  select count(*) FROM select_tab  where year_test < 2155;
 +----------+
 | count(*) |
 +----------+
 |        1 |
 +----------+
 1 row in set (0.00 sec)
 
 mysql>  select count(*) FROM select_tab  where year_test < 2156;
 +----------+
 | count(*) |
 +----------+
 |        1 |
 +----------+
 1 row in set (0.00 sec)
 
[umshastr@hod03]/export/umesh/server/binaries/GABuilds/mysql-5.5.59: bin/mysql -uroot -S /tmp/mysql_ushastry.sock
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.5.59 MySQL Community Server (GPL)

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>  create database if not exists test;
Query OK, 1 row affected, 1 warning (0.00 sec)

mysql>  use test;
Database changed
mysql>  DROP TABLE IF EXISTS select_tab;
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql>  CREATE TABLE `select_tab` (
    ->    `pk` bigint(11) NOT NULL AUTO_INCREMENT,
    ->    `year_test` year(4) DEFAULT NULL,
    ->    PRIMARY KEY (`pk`),
    ->    KEY `index_year_test` (`year_test`)
    ->  ) ENGINE=InnoDB AUTO_INCREMENT=1001 DEFAULT CHARSET=gbk ROW_FORMAT=DYNAMIC;
Query OK, 0 rows affected, 2 warnings (0.01 sec)

mysql>  show create table select_tab\G
*************************** 1. row ***************************
       Table: select_tab
Create Table: CREATE TABLE `select_tab` (
  `pk` bigint(11) NOT NULL AUTO_INCREMENT,
  `year_test` year(4) DEFAULT NULL,
  PRIMARY KEY (`pk`),
  KEY `index_year_test` (`year_test`)
) ENGINE=InnoDB AUTO_INCREMENT=1001 DEFAULT CHARSET=gbk ROW_FORMAT=DYNAMIC
1 row in set (0.00 sec)

mysql>  insert into  select_tab  (pk , year_test) values(1,2014);
Query OK, 1 row affected (0.00 sec)

mysql>  select count(*) FROM select_tab  where year_test < 2155;
+----------+
| count(*) |
+----------+
|        1 |
+----------+
1 row in set (0.00 sec)

mysql>  select count(*) FROM select_tab  where year_test < 2156;
+----------+
| count(*) |
+----------+
|        1 |
+----------+
1 row in set (0.01 sec)

mysql> \q

-- 5.6.39, 5.7.21 -- affected

[umshastr@hod03]/export/umesh/server/binaries/GABuilds/mysql-5.6.39: bin/mysql -uroot -S /tmp/mysql_ushastry.sock
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.6.39 MySQL Community Server (GPL)

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>  create database if not exists test;
Query OK, 1 row affected, 1 warning (0.00 sec)

mysql>  use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql>  DROP TABLE IF EXISTS select_tab;
Query OK, 0 rows affected (0.00 sec)

mysql>  CREATE TABLE `select_tab` (
    ->    `pk` bigint(11) NOT NULL AUTO_INCREMENT,
    ->    `year_test` year(4) DEFAULT NULL,
    ->    PRIMARY KEY (`pk`),
    ->    KEY `index_year_test` (`year_test`)
    ->  ) ENGINE=InnoDB AUTO_INCREMENT=1001 DEFAULT CHARSET=gbk ROW_FORMAT=DYNAMIC;
Query OK, 0 rows affected (0.00 sec)

mysql>  show create table select_tab\G
*************************** 1. row ***************************
       Table: select_tab
Create Table: CREATE TABLE `select_tab` (
  `pk` bigint(11) NOT NULL AUTO_INCREMENT,
  `year_test` year(4) DEFAULT NULL,
  PRIMARY KEY (`pk`),
  KEY `index_year_test` (`year_test`)
) ENGINE=InnoDB AUTO_INCREMENT=1001 DEFAULT CHARSET=gbk ROW_FORMAT=DYNAMIC
1 row in set (0.00 sec)

mysql>  insert into  select_tab  (pk , year_test) values(1,2014);
Query OK, 1 row affected (0.00 sec)

mysql>  select count(*) FROM select_tab  where year_test < 2155;
+----------+
| count(*) |
+----------+
|        1 |
+----------+
1 row in set (0.00 sec)

mysql>  select count(*) FROM select_tab  where year_test < 2156;
+----------+
| count(*) |
+----------+
|        0 |
+----------+
1 row in set (0.00 sec)

-- looks fine for myisam

mysql>  ALTER TABLE select_tab engine=myisam;
Query OK, 1 row affected (0.00 sec)
Records: 1  Duplicates: 0  Warnings: 0

mysql>  show create table select_tab\G
*************************** 1. row ***************************
       Table: select_tab
Create Table: CREATE TABLE `select_tab` (
  `pk` bigint(11) NOT NULL AUTO_INCREMENT,
  `year_test` year(4) DEFAULT NULL,
  PRIMARY KEY (`pk`),
  KEY `index_year_test` (`year_test`)
) ENGINE=MyISAM AUTO_INCREMENT=1001 DEFAULT CHARSET=gbk ROW_FORMAT=DYNAMIC
1 row in set (0.00 sec)

mysql>  select count(*) FROM select_tab  where year_test < 2155;
+----------+
| count(*) |
+----------+
|        1 |
+----------+
1 row in set (0.00 sec)

mysql>  select count(*) FROM select_tab  where year_test < 2156;
+----------+
| count(*) |
+----------+
|        1 |
+----------+
1 row in set (0.00 sec)

[umshastr@hod03]/export/umesh/server/binaries/GABuilds/mysql-5.7.21: bin/mysql -uroot -S /tmp/mysql_ushastry.sock
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.21 MySQL Community Server (GPL)

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>  create database if not exists test;
Query OK, 1 row affected (0.01 sec)

mysql>  use test;
Database changed
mysql>  DROP TABLE IF EXISTS select_tab;
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql>  CREATE TABLE `select_tab` (
    ->    `pk` bigint(11) NOT NULL AUTO_INCREMENT,
    ->    `year_test` year(4) DEFAULT NULL,
    ->    PRIMARY KEY (`pk`),
    ->    KEY `index_year_test` (`year_test`)
    ->  ) ENGINE=InnoDB AUTO_INCREMENT=1001 DEFAULT CHARSET=gbk ROW_FORMAT=DYNAMIC;
Query OK, 0 rows affected (0.01 sec)

mysql>  show create table select_tab\G
*************************** 1. row ***************************
       Table: select_tab
Create Table: CREATE TABLE `select_tab` (
  `pk` bigint(11) NOT NULL AUTO_INCREMENT,
  `year_test` year(4) DEFAULT NULL,
  PRIMARY KEY (`pk`),
  KEY `index_year_test` (`year_test`)
) ENGINE=InnoDB AUTO_INCREMENT=1001 DEFAULT CHARSET=gbk ROW_FORMAT=DYNAMIC
1 row in set (0.01 sec)

mysql>  insert into  select_tab  (pk , year_test) values(1,2014);
Query OK, 1 row affected (0.00 sec)

mysql>  select count(*) FROM select_tab  where year_test < 2155;
+----------+
| count(*) |
+----------+
|        1 |
+----------+
1 row in set (0.00 sec)

mysql>  select count(*) FROM select_tab  where year_test < 2156;
+----------+
| count(*) |
+----------+
|        0 |
+----------+
1 row in set (0.00 sec)

-- looks fine for myisam

mysql>  ALTER TABLE select_tab engine=myisam;
Query OK, 1 row affected (0.01 sec)
Records: 1  Duplicates: 0  Warnings: 0

mysql>  show create table select_tab\G
*************************** 1. row ***************************
       Table: select_tab
Create Table: CREATE TABLE `select_tab` (
  `pk` bigint(11) NOT NULL AUTO_INCREMENT,
  `year_test` year(4) DEFAULT NULL,
  PRIMARY KEY (`pk`),
  KEY `index_year_test` (`year_test`)
) ENGINE=MyISAM AUTO_INCREMENT=1001 DEFAULT CHARSET=gbk ROW_FORMAT=DYNAMIC
1 row in set (0.00 sec)

mysql>  select count(*) FROM select_tab  where year_test < 2155;
+----------+
| count(*) |
+----------+
|        1 |
+----------+
1 row in set (0.00 sec)

mysql>  select count(*) FROM select_tab  where year_test < 2156;
+----------+
| count(*) |
+----------+
|        1 |
+----------+
1 row in set (0.00 sec)