TiDB support help statement

[longlongago7777]

Change Request

同样的mysql命令行，mysql数据库help show 可以显示具体的help contents；
而TiDB不能显示，是不是缺失了帮助信息？
mysql> help show
ERROR 8108 (HY000): Unsupported type *ast.HelpStmt

mysql 命令行版本信息如下：
[root@centos76_vm ~]# mysql -uroot -pTidb123! -h 172.16.7.223 -P4000
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 15
Server version: 5.7.25-TiDB-v5.4.0 TiDB Server (Apache License 2.0) Community Edition, MySQL 5.7 compatible

Copyright (c) 2000, 2022, Oracle and/or its affiliates.

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.

[ran-huang]

Thanks for the feedback! Since this is not a documentation issue, I'm transferring it to the tidb repo, where you might get timely help.

[Defined2014]

TiDB doesn't support help stmt right now, change to feature request.

[dbakit]

+1, help statement is very very convenient for daily work. Otherwise I must open a browser, and search command on pingcap web document..

[longlongago7777]

and sometimes, pingcap web would redirect to the Mysql office documentation.

[shawn0915]

+1, this's very important feature, also recorded in asktug.com,
https://asktug.com/t/topic/903592

[dveeden]

I started to work on this in 2021 in #25485

The main issue is getting help data in a usable format, e.g. extracting this from the docs repo.

Another option would be to basically store and/or generate URLS based on the function and version that a user can then open in a browser.