executor: fix aggregating enum zero value gets different results from mysql (#36208)

[ti-srebot]

cherry-pick #36208 to release-6.1
You can switch your code base to this Pull Request by using git-extras:

# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/36466

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git push [email protected]:ti-srebot/tidb.git pr/36466:release-6.1-065563a8ea4e

---

What problem does this PR solve?

Issue Number: close #26885

Problem Summary:

What is changed and how it works?

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

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

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[ti-srebot]

/run-all-tests

[ti-srebot]

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

[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/786c0d1549f2db8a1c749dcd4d3cf681462a6ed9

[ywqzzy]

/close

[ti-chi-bot]

@ywqzzy: Closed this PR.

In response to this:

/close

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[ywqzzy]

/close