move placement into not keywords

[xhebox]

Signed-off-by: xhe xw897002528@gmail.com

What problem does this PR solve?

placement is not a keyword in mysql. Precedence is used to avoid ambiguity.

Check List

Tests

• Unit test
• Integration test

Related changes

• Need to be included in the release note

[ti-chi-bot]

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[dveeden]

This looks related to https://github.com/pingcap/docs/pull/6195

[xhebox]

This looks related to pingcap/docs#6195

Yes, I was meant to update the document. But after an internal discussion, we now agreed to workaround the parser and make it a real unreserved/not-token keyword, instead of adding it to the reserved(which is not compatible with mysql).

I'll review other tokens proposed in the doc repository later.

[tisonkun]

@xhebox could you explicit @ the participants of the "internal discussion"? like After an offline discussion with @a and @b, ....

[xhebox]

@xhebox could you explicit @ the participants of the "internal discussion"? like After an offline discussion with @a and @b, ....

It is online but in the lark. @bb7133 @djshow832

Anyway, I will merge it now.

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 47ca67b60e50b7e7ef9238d942de7518298c1d55