test_unique_table.groovy and test_unique_table_like.groovy both use database test_unique_db.
If they run at the same time, we may got the following errors:
java.sql.SQLException: errCode = 2, detailMessage = There are still some transactions in the COMMITTED state waiting to be completed. The database [default_cluster:test_unique_db] cannot be dropped. If you want to forcibly drop(cannot be recovered), please use "DROP database FORCE".
Both Master & Branch2.0 have this problem.
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