ddl: assign table record prefix to start/end key if it is empty (#39683)

[ti-chi-bot]

This is an automated cherry-pick of #39683

What problem does this PR solve?

Issue Number: close #39641

Problem Summary:

What is changed and how it works?

As the title said.

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

[zimulala]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-10-09 04:06:16.465403791 +0000 UTC m=+1025174.052513937: ☑️ agreed by zimulala.
• 2023-10-09 04:07:25.323973518 +0000 UTC m=+1025242.911083661: ☑️ agreed by Defined2014.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.5@c9dae10). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

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