sessionctx: set skipInit false for TiDBOptProjectionPushDown and TiDBOptAggPushDown (#35491)

[ti-srebot]

cherry-pick #35491 to release-6.1
You can switch your code base to this Pull Request by using git-extras:

# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/35594

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/tidb.git pr/35594:release-6.1-f89466daa2eb

---

What problem does this PR solve?

Issue Number: close #35083

Problem Summary:

What is changed and how it works?

Set skipInit false for TiDBOptProjectionPushDown and TiDBOptAggPushDown.

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]

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[ti-chi-bot]

@ti-srebot: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

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[ti-srebot]

/run-all-tests

[ti-srebot]

@xuyifangreeneyes you're already a collaborator in bot's repo.

[ti-chi-bot]

@ti-srebot: PR needs rebase.

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[ti-chi-bot]

@ti-srebot: 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	4f377b3	link	true	/test unit-test
idc-jenkins-ci-tidb/build	4f377b3	link	true	/test build
idc-jenkins-ci-tidb/check_dev_2	4f377b3	link	true	/test check-dev2
idc-jenkins-ci-tidb/check_dev	4f377b3	link	true	/test check-dev
idc-jenkins-ci-tidb/mysql-test	4f377b3	link	true	/test mysql-test

Full PR test history. Your PR dashboard.

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