server: split the code and create parse

[hawkingrei]

What problem does this PR solve?

Issue Number: close #44940

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

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-06-28 03:13:44.47340567 +0000 UTC m=+763789.874656113: ☑️ agreed by lcwangchao.
• 2023-06-28 03:39:51.753423991 +0000 UTC m=+765357.154674440: ☑️ agreed by Defined2014.