Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/2352#issuecomment-55441813
If you run `StatisticsSuite` separately with either `sbt test-only` or `mvn
-DwildcardSuites`, you can always reproduce the "default" database missing
exception. Because no command like `SHOW TABLES` gets executed, thus the
"default" database is not created in the temporary testing warehouse directory.
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