# README

Parser

TiDB SQL Parser

How to update parser for TiDB

Assuming that you want to file a PR (pull request) to TiDB, and your PR includes a change in the parser, follow these steps to update the parser in TiDB.

Step 1: Make changes in your parser repository

Fork this repository to your own account and commit the changes to your repository.

Note:

Don't forget to run make test before you commit!

Make sure parser.go is updated.

Suppose the forked repository is https://github.com/your-repo/parser.

Step 2: Make your parser changes take effect in TiDB and run CI

In your TiDB repository, modify the go.mod file, remove github.com/pingcap/parser from the require instruction, and add a new line at the end of the file like this:
```
replace github.com/pingcap/parser => github.com/your-repo/parser v0.0.0-20181102150703-4acd198f5092
```
This change tells TiDB to use the modified parser from your repository.
You can get correct version information by running this command in your TiDB directory:
```
GO111MODULE=on go get -u github.com/your-repo/parser@master
```
If some error is reported, you can ignore it and still edit the go.mod file manually.
File a PR to TiDB.

Step 3: Merge the PR about the parser to this repository

File a PR to this repository. Link the related PR in TiDB in your PR description or comment.

This PR will be reviewed, and if everything goes well, it will be merged.

Step 4: Update TiDB to use the latest parser

In your TiDB pull request, modify the go.mod file manually or use this command:

GO111MODULE=on go get -u github.com/pingcap/parser@master

Make sure the replace instruction is changed back to the require instruction and the version is the latest.