types: fix clustered keyword regexp

[tangenta]

What problem does this PR solve?

Problem Summary:

According to MySQL documentation,

The key attribute PRIMARY KEY can also be specified as just KEY when given in a column definition.

We should also match the pattern for statements like

create table t1 (id int, a varchar(255) key clustered);

What is changed and how it works?

This is a patch for #23247.

Related changes

NA

Check List

Tests

• Unit test
• Integration test

Side effects

NA

Release note

• No release note

[lysu]

/LGTM

[coocood]

/lgtm

[coocood]

/merge

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• coocood
• lysu

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[ti-chi-bot]

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

Commit hash: e9560b3

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