fix: fixed_hash supports Decimal types.

[RinChanNOWWW]

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Summary

Summary about this PR

Closes #10953

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Name	Status	Preview	Comments	Updated (UTC)
databend	⬜️ Ignored (Inspect)			Apr 6, 2023 9:47am

[mergify]

This pull request's title is not fulfill the requirements. @RinChanNOWWW please update it 🙏.

Valid format:

fix(query): fix group by string bug
  ^         ^---------------------^
  |         |
  |         +-> Summary in present tense.
  |
  +-------> Type: rfc, feat, fix, refactor, ci, docs, chore

Valid types:

• rfc: this PR proposes a new RFC
• feat: this PR introduces a new feature to the codebase
• fix: this PR patches a bug in codebase
• refactor: this PR changes the code base without new features or bugfix
• ci: this PR changes build/testing/ci steps
• docs: this PR changes the documents or websites
• chore: this PR only has small changes that no need to record

[RinChanNOWWW]

We can abstract the marshalling of large-sized integers (i128,u128,i256,u256) by databendlabs/opensrv#45.

They are marshlled manually in thie PR.