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]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[tiprow]

Hi @qw4990. Thanks for your PR.

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[ti-chi-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.

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

---

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For example:

Tests

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

[ti-chi-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/build	6964c42	link	true	/test build
idc-jenkins-ci-tidb/unit-test	6964c42	link	true	/test unit-test
idc-jenkins-ci-tidb/check_dev	6964c42	link	true	/test check-dev
idc-jenkins-ci-tidb/check_dev_2	6964c42	link	true	/test check-dev2

Full PR test history. Your PR dashboard.

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.