Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

1. tiup bench tpch --sf=1 prepare
2. alter database test set tiflash replica 1 before everything is done.
3. restart tiflash
4. the core is generated

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

3. What did you see instead (Required)

4. What is your TiFlash version? (Required)