tablecodec.EncodeValue() benchmark function fail after pr/47522

[tiancaiamao]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

go test -tags intest github.com/pingcap/tidb/pkg/tablecodec -run TestBenchDaily -bench Ignore --outfile bench_daily.json

2. What did you expect to see? (Required)

No error

3. What did you see instead (Required)

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x1021b4d]

goroutine 72 [running]:
github.com/pingcap/tidb/pkg/tablecodec.flatten(0x442669?, {0x7, 0x0, 0x0, 0x0, {0x12d638c, 0x6}, {0xc00036e013, 0x1, 0x1}, ...}, ...)
        /home/genius/project/src/github.com/pingcap/tidb/pkg/tablecodec/tablecodec.go:401 +0x8d
github.com/pingcap/tidb/pkg/tablecodec.EncodeValue(0x11a6c20?, {0xc000098b78, 0x0, 0x10}, {0x7, 0x0, 0x0, 0x0, {0x12d638c, 0x6}, ...})
        /home/genius/project/src/github.com/pingcap/tidb/pkg/tablecodec/tablecodec.go:328 +0xa5
github.com/pingcap/tidb/pkg/tablecodec.BenchmarkEncodeValue(0xc00034c000)
        /home/genius/project/src/github.com/pingcap/tidb/pkg/tablecodec/tablecodec_test.go:568 +0x5c5
testing.(*B).runN(0xc00034c000, 0x1)
        /home/genius/project/go/src/testing/benchmark.go:193 +0x102
testing.(*B).run1.func1()
        /home/genius/project/go/src/testing/benchmark.go:233 +0x4e
created by testing.(*B).run1 in goroutine 50
        /home/genius/project/go/src/testing/benchmark.go:226 +0x90
exit status 2
FAIL    github.com/pingcap/tidb/pkg/tablecodec  7.580s

I need to check is there anything wrong, or break by that commit

4. What is your TiDB version? (Required)

master

[tiancaiamao]

Ref #25754

[Ranxy]

This seems to be because PR modified https://github.com/pingcap/tidb/blob/master/pkg/tablecodec/tablecodec.go#L401 and changed the parameter from sc to sc.TypeCtx, but in the benchmark test sc is nil