Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/6894#issuecomment-114608019
One concern I have is supporting both ```Vector``` and
```Array[SomeNumericType]```. Ideally, we would eventually support both.
However, if we use the UnaryTransformer abstraction, we won't be able to. And
once we use that abstraction, we cannot remove it since it's a public API.
@mengxr What are your thoughts? Should we keep everything as a Vector?
The main downside I see is that people working in signal processing (and
other fields) will often be used to being able to use different types.
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