DATA RACE in the builtin_other_vec_generated_test.go

[hawkingrei]

Bug Report

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 WARNING: DATA RACE
Read at 0x00c0006d10e8 by goroutine 247:
  github.com/pingcap/tidb/expression.DisableParseJSONFlag4Expr()
      /go/tidb/expression/util.go:727 +0x99
  github.com/pingcap/tidb/expression.(*inFunctionClass).getFunction()
      /go/tidb/expression/builtin_other.go:100 +0x3e4
  github.com/pingcap/tidb/expression.newFunctionImpl()
      /go/tidb/expression/scalar_function.go:219 +0x69a
  github.com/pingcap/tidb/expression.NewFunction()
      /go/tidb/expression/scalar_function.go:250 +0x756
  github.com/pingcap/tidb/expression.genVecExprBenchCase()
      /go/tidb/expression/bench_test.go:1109 +0x70a
  github.com/pingcap/tidb/expression.testVectorizedEvalOneVec()
      /go/tidb/expression/bench_test.go:1126 +0x209
  github.com/pingcap/tidb/expression.TestVectorizedBuiltinOtherEvalOneVecGenerated()
      /go/tidb/expression/builtin_other_vec_generated_test.go:286 +0x44
  testing.tRunner()
      /usr/local/go/src/testing/testing.go:1259 +0x22f
  testing.(*T).Run·dwrap·21()
      /usr/local/go/src/testing/testing.go:1306 +0x47
Previous write at 0x00c0006d10e8 by goroutine 248:
  [failed to restore the stack]
Goroutine 247 (running) created at:
  testing.(*T).Run()
      /usr/local/go/src/testing/testing.go:1306 +0x726
  testing.runTests.func1()
      /usr/local/go/src/testing/testing.go:1598 +0x99
  testing.tRunner()
      /usr/local/go/src/testing/testing.go:1259 +0x22f
  testing.runTests()
      /usr/local/go/src/testing/testing.go:1596 +0x7ca
  testing.(*M).Run()
      /usr/local/go/src/testing/testing.go:1504 +0x9d1
  github.com/pingcap/tidb/testkit/testmain.(*testingM).Run()
      /go/tidb/testkit/testmain/wrapper.go:28 +0x42
  go.uber.org/goleak.VerifyTestMain()
      /home/prow/go/pkg/mod/go.uber.org/goleak@v1.1.12/testmain.go:53 +0x59
  github.com/pingcap/tidb/expression.TestMain()
      /go/tidb/expression/main_test.go:64 +0x445
  main.main()
      _testmain.go:1005 +0x264
Goroutine 248 (running) created at:
  testing.(*T).Run()
      /usr/local/go/src/testing/testing.go:1306 +0x726
  testing.runTests.func1()
      /usr/local/go/src/testing/testing.go:1598 +0x99
  testing.tRunner()
      /usr/local/go/src/testing/testing.go:1259 +0x22f
  testing.runTests()
      /usr/local/go/src/testing/testing.go:1596 +0x7ca
  testing.(*M).Run()
      /usr/local/go/src/testing/testing.go:1504 +0x9d1
  github.com/pingcap/tidb/testkit/testmain.(*testingM).Run()
      /go/tidb/testkit/testmain/wrapper.go:28 +0x42
  go.uber.org/goleak.VerifyTestMain()
      /home/prow/go/pkg/mod/go.uber.org/goleak@v1.1.12/testmain.go:53 +0x59
  github.com/pingcap/tidb/expression.TestMain()
      /go/tidb/expression/main_test.go:64 +0x445
  main.main()
      _testmain.go:1005 +0x264
================== 

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