Github user avulanov commented on the pull request: https://github.com/apache/spark/pull/8648#issuecomment-138679510 @feynmanliang Thank you for reviewing the code! I made one pass. It seems that UFunc simplifies it a lot. However I am not sure about `.flatten` and `.flatMap` on array of large arrays. We need to perform performance comparison. Could you run the benchmark from https://github.com/avulanov/ann-benchmark before and after refactoring to see the difference?
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