Github user liancheng commented on the pull request: https://github.com/apache/spark/pull/5079#issuecomment-82967018 Hm, the problem is that we should also add the source code of `hello.jar` (probably after renaming it to `TestUdf.jar`). But I'm not quite sure where to put it for now. That's why I said we can merge the fix first, and later add the test in a proper way. In Hive, there is separate Maven module [`itest/test-serde`] [1], which results in a similar `TestSerDe.jar` solely for testing purposes. I wonder is there a simpler way to handle this. Adding a module seems to be an overkill. /cc @marmbrus @yhuai @pwendell [1]: https://github.com/apache/hive/tree/release-0.13.1/itests/test-serde
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