fix substring wrong result bug (#9603)

[ti-chi-bot]

This is an automated cherry-pick of #9603

What problem does this PR solve?

Issue Number: close #9604

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

fix substring wrong result when the second argument is negative

[ti-chi-bot]

@ti-chi-bot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-integration-test	0a3765a	link	true	/test pull-integration-test

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: guo-shaoge

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-19 03:45:54.362451526 +0000 UTC m=+932716.553320524: ☑️ agreed by guo-shaoge.