planner: Manual revert of #24282 (#35298)

[ti-srebot]

cherry-pick #35298 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/37268

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

git push git@github.com:ti-srebot/tidb.git pr/37268:release-6.1-2ba2a9ef56c3

---

What problem does this PR solve?

Issue Number: close #35181, closes #33966, ref #22079

Problem Summary:
In PR #24282 there was an optimization added to remove conditions that was used when calculating the pruned partitions, but it has issues with index-out-of-range and having other side-effects, like index usage is no-longer possible. The optimization is also very limited, since it only removes one selection/comparison (if it would be fixed to work as expected) and could only be used if the partition range is consisting of a single value. So it is better to remove the optimization.

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.

Fixed an issue with index-out-of-range and non-used-index by removing a small optimization.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• chrysan
• qw4990

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[ti-srebot]

/run-all-tests

[ti-srebot]

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

[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/e6afc73acd3bb8566cebc460826b819a84873bcc

[chrysan]

/merge

[ti-chi-bot]

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

Commit hash: d5eb9ba

[chrysan]

/merge