telemetry: Add telemetry information about builtin functions usage

[leiysky]

What problem does this PR solve?

Issue Number: close #25947

Problem Summary:

What is changed and how it works?

Proposal: xxx

What's Changed:

How it Works:

Use a map[string]uint32 to record builtin functions usage information in each telemetry window.

Since for each expression in a single SQL query will be accessed by expressionRewriter, we can record the builtin functions usage information as soon as expressionRewriter.newFunction is invoked. Then we can submit the result to GlobalBuiltinFunctionUsageCollector after executing the query.

After adding this field, the telemetry data will look like:

{
    "beginAt": "2021-07-14T13:42:11.7490453+08:00",
    "executeCount": 0,
    "tiFlashUsage": {
        "pushDown": 0,
        "exchangePushDown": 0
    },
    "coprCacheUsage": {
        "gte0": 0,
        "gte1": 0,
        "gte10": 0,
        "gte20": 0,
        "gte40": 0,
        "gte80": 0,
        "gte100": 0
    },
    "SQLUsage": {
        "total": 0,
        "type": {}
    },
    "builtinFunctionsUsage": {
        "EQInt": 20,
        "EQString": 1,
        "GTInt": 545,
        "GTTime": 548,
        "InString": 1,
        "LTInt": 11,
        "LeftUTF8": 1,
        "PlusInt": 261,
        "SHA2": 1,
        "UnaryNotInt": 1
    }
}

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

• Add telemetry information about builtin functions usage

[leiysky]

/run-all-tests

[leiysky]

/run-all-tests

[leiysky]

/cc @kaixu120811

PTAL.

[tisonkun]

LGTM.

[ti-chi-bot]

@tisonkun: Thanks for your review. The bot only counts approvals from reviewers and higher roles in list, but you're still welcome to leave your comments.

In response to this:

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[leiysky]

/cc @breeswish

[LittleFall]

LGTM�

[ti-chi-bot]

@LittleFall: Thanks for your review. The bot only counts approvals from reviewers and higher roles in list, but you're still welcome to leave your comments.

In response to this:

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[LittleFall]

test need fix:

[2021-07-15T08:07:27.464Z] FAIL: planbuilder_test.go:144: testPlanBuilderSuite.TestDisableFold
[2021-07-15T08:07:27.464Z] 
[2021-07-15T08:07:27.464Z] planbuilder_test.go:184:
[2021-07-15T08:07:27.464Z]     c.Assert(rewritenArg, FitsTypeOf, expectedArg)
[2021-07-15T08:07:27.464Z] ... obtained *expression.Constant = &expression.Constant{Value:types.Datum{k:0x4, decimal:0x0, length:0x0, i:-4621415532179685754, collation:"", b:[]uint8(nil), x:interface {}(nil)}, RetType:(*types.FieldType)(0xc00080fc20), DeferredExpr:expression.Expression(nil), ParamMarker:(*expression.ParamMarker)(nil), hashcode:[]uint8(nil), collationInfo:expression.collationInfo{coer:5, coerInit:true, charset:"", collation:"", flen:0}} ("-0.45990349068959124")
[2021-07-15T08:07:27.464Z] ... sample *expression.ScalarFunction = &expression.ScalarFunction{FuncName:model.CIStr{O:"", L:""}, RetType:(*types.FieldType)(nil), Function:expression.builtinFunc(nil), hashcode:[]uint8(nil)} (%!q(PANIC=String method: runtime error: invalid memory address or nil pointer dereference))

[leiysky]

/run-all-tests

[ti-chi-bot]

@Vancior: Request changes is only allowed for the reviewers in list.

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[Vancior]

LGTM.
@lucklove

[lucklove]

/sig tiup

[lucklove]

LGTM

[leiysky]

/remove-sig tiup

[leiysky]

/remove-sig sql-infra

[LittleFall]

LGTM

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• LittleFall
• lucklove

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[LittleFall]

/merge

[leiysky]

/merge

[ti-chi-bot]

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

Commit hash: 3ea15b4

[ti-chi-bot]

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

Commit hash: 3ea15b4

[leiysky]

/sig tiup

[dveeden]

Please add details about this to https://docs.pingcap.com/tidb/stable/telemetry once merged

[lilyjazz]

doc pr: pingcap/docs-cn#6841

[breezewish]

@lzmhhh123 is performing additional review for this PR.