Unity

[qw4990]

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary:

What changed and how does it work?

 explain format='unity' select * from t1, t2 where t1.a=1 and t1.b>t2.b;

{
    "Tables": {
        "test.t1": {
            "AsName": "", 
            "Columns": {
                "test.t1.a": {
                    "NDV": 2000, 
                    "Nulls": 0, 
                    "Min": "500", 
                    "Max": "1999", 
                    "Histogram": [
                        {
                            "Lower": "500", 
                            "Upper": "505", 
                            "Count": 7
                        }, 
                        {
                            "Lower": "506", 
                            "Upper": "511", 
                            "Count": 6
                        }
                    ]
                }, 
                "test.t1.b": {
                    "NDV": 2000, 
                    "Nulls": 0, 
                    "Min": "500", 
                    "Max": "1999", 
                    "Histogram": [
                        {
                            "Lower": "500", 
                            "Upper": "505", 
                            "Count": 7
                        }, 
                        {
                            "Lower": "506", 
                            "Upper": "511", 
                            "Count": 6
                        }
                    ]
                }
            }, 
            "Indexes": {
                "test.t1.a": {
                    "NDV": 2000, 
                    "Nulls": 0
                }
            }, 
            "RealtimeRows": 2000, 
            "ModifiedRows": 0
        }, 
        "test.t2": {
            "AsName": "", 
            "Columns": {
                "test.t2.b": {
                    "NDV": 2000, 
                    "Nulls": 0, 
                    "Min": "500", 
                    "Max": "1999", 
                    "Histogram": [
                        {
                            "Lower": "500", 
                            "Upper": "505", 
                            "Count": 7
                        }, 
                        {
                            "Lower": "506", 
                            "Upper": "511", 
                            "Count": 6
                        } 
                    ]
                }
            }, 
            "Indexes": {
                "test.t2.a": {
                    "NDV": 2000, 
                    "Nulls": 0
                }
            }, 
            "RealtimeRows": 2000, 
            "ModifiedRows": 0
        }
    }, 
    "Hints": [
        "merge_join(test.t1)", 
        "use_index(test.t2, test.t2.a)", 
        "index_join(test.t1)", 
        "leading(test.t1, test.t2)", 
        "hash_join(test.t1)", 
        "leading(test.t2, test.t1)", 
        "use_index(test.t1, test.t1.a)", 
        "hash_join(test.t2)", 
        "merge_join(test.t2)", 
        "index_join(test.t2)"
    ]
}

Check List

Tests

• [ ] Unit test
• [ ] Integration test
• [ ] Manual test (add detailed scripts or steps below)
• [ ] No need to test

  • [ ] I checked and no code files have been changed.

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[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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Needs approval from an approver in each of these files: - **[OWNERS](https://github.com/pingcap/tidb/blob/master/OWNERS)** - **[pkg/planner/OWNERS](https://github.com/pingcap/tidb/blob/master/pkg/planner/OWNERS)** Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[tiprow[bot]]

Hi @qw4990. Thanks for your PR.

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[ti-chi-bot[bot]]

[FORMAT CHECKER NOTIFICATION]

Notice: To remove the do-not-merge/invalid-title label, please follow title format, for example pkg [, pkg2, pkg3]: what is changed or *: what is changed.

_{:open_book: For more info, you can check the "Contribute Code" section in the development guide.}

---

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For example:

Tests

• [x] Unit test
• [ ] Integration test
• [ ] Manual test (add detailed scripts or steps below)
• [ ] No code

_{:open_book: For more info, you can check the "Contribute Code" section in the development guide.}

[ti-chi-bot[bot]]

@qw4990: 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	83cd0888a2a68d40dfb6110bfdedcda61a49c9c4	link	true	/test unit-test
idc-jenkins-ci-tidb/build	83cd0888a2a68d40dfb6110bfdedcda61a49c9c4	link	true	/test build
idc-jenkins-ci-tidb/check_dev	83cd0888a2a68d40dfb6110bfdedcda61a49c9c4	link	true	/test check-dev
idc-jenkins-ci-tidb/check_dev_2	83cd0888a2a68d40dfb6110bfdedcda61a49c9c4	link	true	/test check-dev2

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository. I understand the commands that are listed [here](https://go.k8s.io/bot-commands).