ddl, parser: make generated column and expression index same as MySQL (#39888)

[ti-chi-bot]

This is an automated cherry-pick of #39888

What problem does this PR solve?

Issue Number: close #39826

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]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Defined2014, tiancaiamao

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-12 06:41:41.990841067 +0000 UTC m=+511371.731265006: ☑️ agreed by Defined2014.
• 2024-09-12 06:44:15.445894141 +0000 UTC m=+511525.186318100: ☑️ agreed by tiancaiamao.

[Defined2014]

/retest

[codecov]

Codecov Report

Attention: Patch coverage is 93.33333% with 3 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-6.5@1e7b160). Learn more about missing BASE report.

Additional details and impacted files

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