storage: refine DeltaMergeStore

[Lloyd-Pottiger]

What problem does this PR solve?

Issue Number: ref #6233

Problem Summary:

What is changed and how it works?

storage: refine DeltaMergeStore

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

None

[CalvinNeo]

lgtm

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CalvinNeo, JaySon-Huang

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• OWNERS [CalvinNeo,JaySon-Huang]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-28 16:54:12.514520325 +0000 UTC m=+975647.648970442: ☑️ agreed by JaySon-Huang.
• 2024-08-29 04:36:03.216141523 +0000 UTC m=+1017758.350591655: ☑️ agreed by CalvinNeo.

[ti-chi-bot]

@Lloyd-Pottiger: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

trigger some heavy tests which will not run always when PR updated.

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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[Lloyd-Pottiger]

/retest