Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/11559#issuecomment-193496075
@holdenk @rxin I added the Java iterator support due to the wholestage
codegen version of `Sample` in #11517. I was using Scala iterator but as
`RandomSampler` interface can't accept Java iterator it is quite annoying that
I need to use Scala mutable collection such as `ArrayBuffer` in codegen's Java
code. By doing this, there seems weird janino error happened. The solution
approach is to Java list and iterator and let `RandomSampler` interface simply
accepts Java iterator like this.
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