Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/11443#issuecomment-194252311
@marmbrus After this migration, the following Java code doesn't compile any
more:
```java
Array<Row> = df.collect()
```
This is because `Dataset.collect()` now returns `Array[T]`, while Java
doesn't allow returning generic array, and thus erased the type to `Object` on
Java side. I added `collectRows()`/`takeRows()` mostly for compiling existing
MLlib code without significant potential performance regression.
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