Support enum with index 0 (#8533)

[ti-chi-bot]

This is an automated cherry-pick of #8533

What problem does this PR solve?

Issue Number: close #8311

Problem Summary:

• According to https://dev.mysql.com/doc/refman/8.0/en/enum.html, enum index 0 is valid.
• For ENUM values, the index number is used in the calculation.

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

Fix the issue that TiFlash can not handle enum with index 0

[solotzg]

/approve

[ti-chi-bot]

@solotzg: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[solotzg]

/run-unit-test

[solotzg]

/cc @windtalker

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: solotzg, zanmato1984

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Needs approval from an approver in each of these files:

• OWNERS [solotzg,zanmato1984]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-05-11 12:32:22.093829385 +0000 UTC m=+1310895.850964956: ☑️ agreed by solotzg.
• 2024-05-31 01:49:01.821212388 +0000 UTC m=+3000295.578347961: ☑️ agreed by zanmato1984.

[JaySon-Huang]

/run-all-tests