Incompatible with MySQL 8.0 about create table with default expression #10377

➜  ~ tidiff 'create table ttest ( a int(10) default (rand()))'
MySQL(127.0.0.1:3306)> create table ttest ( a int(10) default (rand()))
Query OK (0.007 sec)

TiDB(127.0.0.1:4000)> create table ttest ( a int(10) default (rand()))
Error 1105: line 1 column 40 near "rand()))" (total length 48)

➜  ~ tidiff 'desc ttest'
MySQL(127.0.0.1:3306)> desc ttest
+------------------------------------------------------------+
| Field | Type    | Null | Key | Default | Extra             |
+------------------------------------------------------------+
| a     | int(10) | YES  |     | rand()  | DEFAULT_GENERATED |
+------------------------------------------------------------+
1 row in set (0.003 sec)

TiDB(127.0.0.1:4000)> desc ttest
Error 1146: Table 'test.ttest' doesn't exist

TiDB(127.0.0.1:4000)> select tidb_version()
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| tidb_version()                                                                                                                                                                                                                                                                                                                            |
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Release Version: v2.1.8-24-g7b36cdfb6-dirty
Git Commit Hash: 7b36cdfb6e8a4c279fc360ed79cf1c499b553688
Git Branch: failpoint-2.1
UTC Build Time: 2019-04-30 08:26:17
GoVersion: go version go1.12 darwin/amd64
Race Enabled: false
TiKV Min Version: 2.1.0-alpha.1-ff3dd160846b7d1aed9079c389fc188f7f5ea13e
Check Table Before Drop: false |
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.002 sec)