Github user mccheah commented on the pull request:
https://github.com/apache/spark/pull/4972#issuecomment-78764036
Latest just uses ScalaRunTime which also doesn't use the native
java.lang.reflect.Array. The underlying implementation is basically identical
to the first Java implementation that I wrote on here, except I need to do an
extra "asInstanceOf[AnyRef]" to convert from Any (which is what
ScalaRunTime.array_apply returns) to AnyRef (which is what we want in
SizeEstimator).
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