expression: implement rightShift function pushdown

[Willendless]

What problem does this PR solve?

Issue Number: close #35871
Related Issue: pingcap/tiflash#5100

Problem Summary:

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.

Support to pushdown rightShift to TiFlash

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• guo-shaoge
• zanmato1984

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[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/a175151e49289b642033f0c93419ea907048d2d6

[Willendless]

/run-mysql-test

[SeaRise]

we can add a UT in

tidb/expression/expr_to_pb_test.go

Line 506 in ab27d49

func TestExprPushDownToFlash(t *testing.T) {

[SeaRise]

And we can add UT in https://github.com/pingcap/tidb/blob/ab27d4918a5a07d565ce3ef98761b6de6e90c9cc/planner/core/integration_test.go, like

func Test${func_name}PushDownToTiFlash(t *testing.T) {
        store, clean := testkit.CreateMockStore(t)
        defer clean()
        tk := testkit.NewTestKit(t, store)
        tk.MustExec("use test")
        tk.MustExec("drop table if exists t")
        tk.MustExec("create table t (id int, value decimal(6,3), name char(128))")
        tk.MustExec("set @@tidb_allow_mpp=1; set @@tidb_enforce_mpp=1;")
        tk.MustExec("set @@tidb_isolation_read_engines = 'tiflash'")

        // Create virtual tiflash replica info.
        dom := domain.GetDomain(tk.Session())
        is := dom.InfoSchema()
        db, exists := is.SchemaByName(model.NewCIStr("test"))
        require.True(t, exists)
        for _, tblInfo := range db.Tables {
                if tblInfo.Name.L == "t" {
                        tblInfo.TiFlashReplica = &model.TiFlashReplicaInfo{
                                Count:     1,
                                Available: true,
                        }
                }
        }
        
        tk.MustQuery("explain select ${func}(a) from t;").Check(testkit.Rows(${plan}))
}

[Willendless]

Got it!

[zanmato1984]

LGTM

[SeaRise]

/lgtm

[zanmato1984]

/merge

[ti-chi-bot]

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

Commit hash: 4d733d2bafbdb55c8f6246c45e4f7971f75b5a52

[zanmato1984]

/merge

[guo-shaoge]

/merge

[ti-chi-bot]

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

Commit hash: f07ae51

[sre-bot]

TiDB MergeCI notify

🔴 Bad News! New failing [1] after this pr merged.
These new failed integration tests seem to be caused by the current PR, please try to fix these new failed integration tests, thanks!

CI Name	Result	Duration	Compare with Parent commit
idc-jenkins-ci-tidb/common-test	🟥 failed 1, success 11, total 12	13 min	New failing
idc-jenkins-ci/integration-cdc-test	✅ all 36 tests passed	25 min	Fixed
idc-jenkins-ci-tidb/integration-common-test	🟢 all 11 tests passed	31 min	Existing passed
idc-jenkins-ci-tidb/sqllogic-test-2	🟢 all 28 tests passed	12 min	Existing passed
idc-jenkins-ci-tidb/sqllogic-test-1	🟢 all 26 tests passed	7 min 53 sec	Existing passed
idc-jenkins-ci-tidb/integration-ddl-test	🟢 all 6 tests passed	5 min 53 sec	Existing passed
idc-jenkins-ci-tidb/tics-test	🟢 all 1 tests passed	5 min 4 sec	Existing passed
idc-jenkins-ci-tidb/integration-compatibility-test	🟢 all 1 tests passed	2 min 55 sec	Existing passed
idc-jenkins-ci-tidb/mybatis-test	🟢 all 1 tests passed	2 min 43 sec	Existing passed
idc-jenkins-ci-tidb/plugin-test	🟢 build success, plugin test success	4min	Existing passed