planner: fix AccessPath.TableFilters got modified unexpectedly (#30966)

[ti-srebot]

cherry-pick #30966 to release-4.0
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/30975

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

git push git@github.com:ti-srebot/tidb.git pr/30975:release-4.0-e24493f411e6

---

What problem does this PR solve?

Issue Number: close #30965

Problem Summary:

SplitSelCondsWithVirtualColumn will modify the slice argument.

We pass AccessPath.TableFilters to SplitSelCondsWithVirtualColumn. This makes the following process of physical optimization generate wrong query plans.

What is changed and how it works?

SplitSelCondsWithVirtualColumn no longer modifies the argument slice. Now it returns two new slices.

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

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]

@time-and-fate you're already a collaborator in bot's repo.

[xhebox]

close for DMR version