executor: fix the wrong output when the whole data of partition table…

[winoros]

What problem does this PR solve?

Issue Number: close #41801

Problem Summary:

What is changed and how it works?

In the master branch, we support the merge operation for Reader executor.
In this release branch, we provide a quick fix on the order prop push down for partitioned table miss the corner case for index scan.

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.

Fix the bug that TiDB might return wrong results when the partition table is tiny and is put into only one region.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• Defined2014
• time-and-fate

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

The full list of commands accepted by this bot can be found here.

Details

Reviewer can indicate their review by submitting an approval review.
Reviewer can cancel approval by submitting a request changes review.

[hawkingrei]

/retest

[hawkingrei]

/merge

[ti-chi-bot]

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

Details

Commit hash: 998c5f1

[hawkingrei]

/retest

[chrysan]

/retest

[hawkingrei]

/retest

[Defined2014]

It's not a unstable test :(
PTAL about TestIndexJoinUnionScan @winoros

[Defined2014]

/hold

[winoros]

/merge

[ti-chi-bot]

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

Details

Commit hash: 7177845

[winoros]

/unhold

[winoros]

/merge

[ti-chi-bot]

@winoros: The following test 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	4f48c81	link	true	/test unit-test

Full PR test history. Your PR dashboard.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.