Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

1. create table

create table test.t1 (a int, b int) SHARD_ROW_ID_BITS=2 PRE_SPLIT_REGIONS=2;
alter table test.t1 attributes "merge_option=deny";

2. snapshot backup and restore

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

show table test.t1 regions;
select * from information_schema.attributes from test.t1;

3. What did you see instead (Required)

nothing

4. What is your TiDB version? (Required)

master