planner: fix tiflash path will be identified as table dual (#49338)

[ti-chi-bot]

This is an automated cherry-pick of #49338

What problem does this PR solve?

Issue Number: close #49285

Problem Summary:

What changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

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.

planner: fix tiflash path will be identified as table dual

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AilinKid, qw4990

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-12-22 07:08:52.142692727 +0000 UTC m=+1204023.179919655: ☑️ agreed by AilinKid.
• 2023-12-22 07:42:59.616653918 +0000 UTC m=+1206070.653880845: ☑️ agreed by qw4990.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.5@859fade). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
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[AilinKid]

/test unit-test

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@AilinKid: No presubmit jobs available for pingcap/[email protected]

In response to this:

/test unit-test

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[AilinKid]

/test unit-test

[tiprow]

@AilinKid: No presubmit jobs available for pingcap/[email protected]

In response to this:

/test unit-test

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