tangenta

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All the changes has been merged to master, so I will close this PR.

What about the naming like `addBatchDDLJobsV2`?

Please resolve the conflicts and update the dependency in TiDB.

这个文件是从 MySQL 8.0 的[语法文件](https://github.com/mysql/mysql-server/blob/8.0/sql/sql_yacc.yy)转换而成的。 --- This file is converted from the MySQL 8.0 [syntax file](https://github.com/mysql/mysql-server/blob/8.0/sql/sql_yacc.yy).

用 [bison](https://www.gnu.org/software/bison/) 指定 `-v` 参数传入语法文件,然后将不需要的部分删掉就行了。 --- Use bison to specify the -v parameter to pass in the syntax file, and then just delete the parts you don't need.

欢迎随时移步 [tidb-community slack](https://slack.tidb.io/invite?team=tidb-community&channel=everyone&ref=pingcap) 的 sig-sql-infra channel 进一步讨论。 --- Feel free to move to the sig-sql-infra channel of the tidb-community slack for further discussion.

What is the unit? Percentage?

v3.1.0 release is not the latest version and it lacks the package `parser_driver`. ``` go get -v github.com/pingcap/[email protected] ``` should fix the problem. See https://github.com/pingcap/parser/blob/master/docs/quickstart.md#import-dependencies.

Okay. As a workaround, you can specify the githash on `v4.0.0-rc.1`: ``` go get -v github.com/pingcap/parser@7329d80 ``` Let's figure out how to solve this annoying problem :(

The parser instance is expected to be reused.