session: reset CTEStorageMap before txn conflict and retry() (#49399)

[ti-chi-bot]

This is an automated cherry-pick of #49399

What problem does this PR solve?

Issue Number: close #46522

Problem Summary:

sctx.CTEStorageMap was set to nil in finishStmt, the code may call retry() in doCommitWithRetry() and rebuild the statement, during the rebuild process, sctx.CTEStorageMap type assertion fail.

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.

None

[ti-chi-bot]

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[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

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