show query support format

[TCeason]

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Summary

Actually we have three ideas:

1. For every should support format cause's query modify the planner but that will modify so many planner code.

2. In clickhouse handler token the SQL and use nom cut the FORMAT keyword and then get the format value. But it has a bad case like this: select format from default.format format xxx;

3. In this pr, all of the statement is #statment_body and the format is always at the last of the statement body. So we just need to modify the final rule.

Changelog

• New Feature

Related Issues

Fixes #6298

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1 Ignored Deployment

Name	Status	Preview	Updated
databend	⬜️ Ignored (Inspect)		Jun 30, 2022 at 0:32AM (UTC)

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[BohuTANG]

Need a stateless test for it, to avoid someone breaking it in the future, and we can easy to document it from the test case.

[TCeason]

Need a stateless test for it, to avoid someone breaking it in the future, and we can easy to document it from the test case.

Yes because the ClickHouse http handler will use old parser to parse the sql. If err it’ll directly return err.

So I only add new parser test.

And now in old parser not support format keyword in show or other query like desc.

Maybe we can set the or to draft. when the planer v2 is enable default add some test?

[BohuTANG]

ditto