fix lpad/rpad trailing zero miss (#9610)

[ti-chi-bot]

This is an automated cherry-pick of #9610

What problem does this PR solve?

Issue Number: close #9465

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 lpad/rpad trailing zero miss

[windtalker]

lgtm

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-19 05:12:55.491028637 +0000 UTC m=+937937.681897619: ☑️ agreed by windtalker.
• 2024-11-20 06:16:37.543097147 +0000 UTC m=+12385.162751660: ☑️ agreed by guo-shaoge.

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Test name	Commit	Details	Required	Rerun command
pull-integration-test	f5a3179	link	true	/test pull-integration-test

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