I have a spark optimization query that I have posted on StackOverflow, any guidance on this would be appreciated. Please follow the link below, I have explained the problem in depth here with code. http://stackoverflow.com/questions/40192302/why-is-that-two-stages-in-apache-spark-are-computing-same-thing <http://stackoverflow.com/questions/40192302/why-is-that-two-stages-in-apache-spark-are-computing-same-thing>
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