planner: fix Merge hint for view (#36678)

[ti-srebot]

cherry-pick #36678 to release-6.2
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/36760

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

git push [email protected]:ti-srebot/tidb.git pr/36760:release-6.2-1f6f7da778b0

---

What problem does this PR solve?

Issue Number: close #36666

Problem Summary:
When the CTE query has view, hint will not work. Because the current CTE's hint information will be overwritten in BuildView, so we save the CTE hint information and pass it back after BuildView.

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]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• winoros
• wjhuang2016

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[ti-srebot]

/run-all-tests

[ti-srebot]

@dayicklp please accept the invitation then you can push to the cherry-pick pull requests. Comment with /cherry-pick-invite if the invitation is expired.
https://github.com/ti-srebot/tidb/invitations

[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/16f8c0efa33f8f8b234546d72221ed0cd5c0973f

[dayicklp]

/cherry-pick-invite

[ti-srebot]

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

[wjhuang2016]

/merge

[ti-chi-bot]

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

Commit hash: 16f8c0e