Github user blrunner commented on the pull request:
https://github.com/apache/tajo/pull/979#issuecomment-212331340
I implemented unit test cases for verifying following cases.
* ``DirectOutputCommitter`` can recover existing files successfully in
query failure case.
* ``DirectOutputCommitter`` can remove output files successfully in query
failure case.
* When executing ``INSERT INTO`` query, ``DirectOutputCommitter`` can
maintain existing files.
For the reference, I found that outputs of ``TestInsertQuery`` and
``TestTablePartitions`` with ``DirectOutputCommitter`` were equals to outputs
of them without ``DirectOutputCommitter``.
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