PartitionPruningRDD is using index from parent
PartitionPruningRDD is using index from parent(review changes)
Merge branch 'master' of github.com:tbfenet/incubator-spark

PartitionPruningRDD is using index from parent

I was getting a ArrayIndexOutOfBoundsException exception after doing union on pruned RDD. The index it was using on the partition was the index in the original RDD not the new pruned RDD.