Github user mengxr commented on the pull request: https://github.com/apache/spark/pull/3319#issuecomment-64310622 @brkyvz Two comments on the API: 1) For the APIs we provide, could you add a JAVA test suite and verify that all methods work in Java. 2) `horzCat` and `vertCat` are not MATLAB operators, nor NumPy's. Maybe we should rename them to `hstack` and `vstack`, which are at least known by NumPy users.
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