session: set EnableWindowFunction for all SessionVars (#55991)

[winoros]

Manually cherry-pick #55991

What problem does this PR solve?

Issue Number: ref #55981

Problem Summary:

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]

@winoros: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/unit-test	6623546	link	true	/test unit-test
idc-jenkins-ci-tidb/check_dev	6623546	link	true	/test check-dev

Full PR test history. Your PR dashboard.

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-10 16:29:58.174881895 +0000 UTC m=+373867.915305837: ☑️ agreed by qw4990.
• 2024-09-10 16:58:24.750180921 +0000 UTC m=+375574.490604856: ☑️ agreed by hawkingrei.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, qw4990

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