panic in batchCheckTemporaryUniqueKey

[wjhuang2016]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

I don't figure out how to reproduce it. What I know now it's the error in the tidb log.

["panic in the recoverable goroutine"] [label=ddl] [funcInfo=backfillWorker.run] [r={}] [stack="github.com/pingcap/tidb/util.Recover\n\t/Users/pingcap/workspace/build-common@4/go/src/github.com/pingcap/tidb/util/misc.go:120\nruntime.gopanic\n\t/usr/local/go1.19.3/src/runtime/panic.go:884\nruntime.goPanicIndex\n\t/usr/local/go1.19.3/src/runtime/panic.go:113\nencoding/binary.bigEndian.Uint64\n\t/usr/local/go1.19.3/src/encoding/binary/binary.go:179\ngithub.com/pingcap/tidb/tablecodec.DecodeHandleInUniqueIndexValue\n\t/Users/pingcap/workspace/build-common@4/go/src/github.com/pingcap/tidb/tablecodec/tablecodec.go:1532\ngithub.com/pingcap/tidb/ddl.(*mergeIndexWorker).batchCheckTemporaryUniqueKey\n\t/Users/pingcap/workspace/build-common@4/go/src/github.com/pingcap/tidb/ddl/index_merge_tmp.go:63\ngithub.com/pingcap/tidb/ddl.(*mergeIndexWorker).BackfillDataInTxn.func1\n\t/Users/pingcap/workspace/build-common@4/go/src/github.com/pingcap/tidb/ddl/index_merge_tmp.go:133\ngithub.com/pingcap/tidb/kv.RunInNewTxn\n\t/Users/pingcap/workspace/build-common@4/go/src/github.com/pingcap/tidb/kv/txn.go:129\ngithub.com/pingcap/tidb/ddl.(*mergeIndexWorker).BackfillDataInTxn\n\t/Users/pingcap/workspace/build-common@4/go/src/github.com/pingcap/tidb/ddl/index_merge_tmp.go:118\ngithub.com/pingcap/tidb/ddl.(*backfillWorker).handleBackfillTask\n\t/Users/pingcap/workspace/build-common@4/go/src/github.com/pingcap/tidb/ddl/backfilling.go:377\ngithub.com/pingcap/tidb/ddl.(*backfillWorker).run\n\t/Users/pingcap/workspace/build-common@4/go/src/github.com/pingcap/tidb/ddl/backfilling.go:479"]

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

No error

3. What did you see instead (Required)

Add unique index can't finish because of the panic.

4. What is your TiDB version? (Required)

master