codec: Don't convert set or enum datum to float64 when encoding them (#32308)

[ti-srebot]

cherry-pick #32308 to release-5.4
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/32355

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---

Signed-off-by: ekexium ekexium@gmail.com

What problem does this PR solve?

Issue Number: close #32302

Problem Summary:

When a enum or a set datum is encoded, it's uint64 value is converted to float64 and then converted back to uint64, resulting in the loss of lower bits.

What is changed and how it works?

Use the original Value, don't convert.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• sticnarf
• tiancaiamao

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[ti-srebot]

/run-all-tests

[ti-srebot]

@ekexium you're already a collaborator in bot's repo.

[ekexium]

/run-check_dev

[ekexium]

/run-check_dev

[tiancaiamao]

Please address conflict @ekexium

[ti-chi-bot]

@ti-srebot: PR needs rebase.

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[ekexium]

PTAL @cfzjywxk @MyonKeminta

[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/1a8e34ccf32de001b48bbb3908df89d76b869cd5

[TonsnakeLin]

LGTM

[ti-chi-bot]

@TonsnakeLin: Thanks for your review. The bot only counts approvals from reviewers and higher roles in list, but you're still welcome to leave your comments.

In response to this:

LGTM

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[tiancaiamao]

/merge

[ti-chi-bot]

@tiancaiamao: /merge in this pull request requires 2 approval(s).

In response to this:

/merge

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[sticnarf]

/merge

[ti-chi-bot]

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

Commit hash: 76a6414

[ti-chi-bot]

@ti-srebot: Your PR was out of date, I have automatically updated it for you.

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