Description
Hive UT currently uses Derby DB with storage on disk which have some practical problems.
1. The run-time of Hive unit tests are high as need to operate on the disk quite often.
2. It can cause conflict if multiple test cases operates on the same table name (such as table being created already exist).
To solve these problems, we shall use an in-memory storage option of Derby DB which can be even persisted if the test case demands that.
https://db.apache.org/derby/docs/10.8/devguide/cdevdvlpinmemdb.html
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