*: prevent cursor read from being cancelled by GC (#39950)

[ti-chi-bot]

This is an automated cherry-pick of #39950

Signed-off-by: zyguan [email protected]

What problem does this PR solve?

Issue Number: close #39447

Problem Summary:

Cursor read might be cancelled by GC since min-start-ts is calculated by min([s.ProcessInfo.CurTxnStartTS for s in all sessions]) however the CurTxnStartTS will be reset once fetch returned.

What is changed and how it works?

1. Let each session hold a list of pretected timestamps.
2. Let session manager calculate the min-start-ts (considering protected timestamps).
3. When start to do cursor read, hold the start-ts until the result set gets close.

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]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• cfzjywxk
• ekexium

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[zyguan]

/retest

[cfzjywxk]

@zyguan
Please help to resolve the conflicts.

[cfzjywxk]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 5bed421