failure tests of DeltaMergeStore

[JaySon-Huang]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

-- it's OK
./dbms/gtests_dbms --gtest_filter='*DeltaMergeStoreRWTest.DDLIssue*'
-- it's OK
./dbms/gtests_dbms --gtest_filter='*DeltaMergeStoreRWTest.TestFastScanWithMultipleBlockWithOverlap/V1_BlockOnly*'
-- it's fail
./dbms/gtests_dbms --gtest_filter='*DeltaMergeStoreRWTest.DDLIssue*:*DeltaMergeStoreRWTest.TestFastScanWithMultipleBlockWithOverlap/V1_BlockOnly*'

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

All tests passed

3. What did you see instead (Required)

4. What is your TiFlash version? (Required)

master