Commits on Oct 30, 2020

1. Update "Type system differences" for MySQL Compatibility …

   TiDB:
   ```
   mysql> SELECT tidb_version()\G
   *************************** 1. row ***************************
   tidb_version(): Release Version: v4.0.8
   Edition: Community
   Git Commit Hash: 66ac9fc31f1733e5eb8d11891ec1b38f9c422817
   Git Branch: heads/refs/tags/v4.0.8
   UTC Build Time: 2020-10-30 08:21:16
   GoVersion: go1.13
   Race Enabled: false
   TiKV Min Version: v3.0.0-60965b006877ca7234adaced7890d7b029ed1306
   Check Table Before Drop: false
   1 row in set (0.00 sec)
   
   mysql> CREATE TABLE t1 (id SERIAL, y SQL_TSI_YEAR, f FIXED(4,2));
   Query OK, 0 rows affected (0.11 sec)
   
   mysql> SHOW CREATE TABLE t1\G
   *************************** 1. row ***************************
          Table: t1
   Create Table: CREATE TABLE `t1` (
     `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
     `y` year(4) DEFAULT NULL,
     `f` decimal(4,2) DEFAULT NULL,
     UNIQUE KEY `id` (`id`)
   ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
   1 row in set (0.01 sec)
   ```
   
   MySQL:
   ```
   mysql> SELECT VERSION();
   +-----------+
   | VERSION() |
   +-----------+
   | 8.0.20    |
   +-----------+
   1 row in set (0.00 sec)
   
   mysql> CREATE TABLE t1 (id SERIAL, y SQL_TSI_YEAR, f FIXED(4,2));
   Query OK, 0 rows affected (0.06 sec)
   
   mysql> SHOW CREATE TABLE t1\G
   *************************** 1. row ***************************
          Table: t1
   Create Table: CREATE TABLE `t1` (
     `id` bigint unsigned NOT NULL AUTO_INCREMENT,
     `y` year DEFAULT NULL,
     `f` decimal(4,2) DEFAULT NULL,
     UNIQUE KEY `id` (`id`)
   ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
   1 row in set (0.00 sec)
   ```

   

   dveeden committed Oct 30, 2020
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