server: ignore Preprocess error for the prefetchPointPlanKeys optimization (#39945)

[ti-chi-bot]

This is an automated cherry-pick of #39945

What problem does this PR solve?

Issue Number: close #39664

Problem Summary:

What is changed and how it works?

The error is throw from the Preprocess() in the prefetchPointPlanKeys.
prefetchPointPlanKeys is quite tricky, it does not reuse the common code path for the sake of performance.

Premature optimization is the root of all evil.
This tricky optimization helped us improve the performance by 100 times and won the deal, and now it's time to pay the (technical) debt.

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]

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[ti-chi-bot]

@ti-chi-bot: This cherry pick PR is for a release branch and has not yet been approved by release team.
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:

• 2024-04-01 08:47:15.170709251 +0000 UTC m=+260896.698249789: ☑️ agreed by Defined2014.
• 2024-04-01 08:49:11.865077112 +0000 UTC m=+261013.392617658: ☑️ agreed by tiancaiamao.

[Defined2014]

/retest

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.5@1a2b9bf). Click here to learn what that means.
The diff coverage is 0.0000%.

Additional details and impacted files

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