Github user marmbrus commented on the pull request: https://github.com/apache/spark/pull/2230#issuecomment-54252034 Thanks for working on this! The changes made to the parser seem reasonable to me. Thanks for the thorough explanation. Can you explain your changes to LogicalPlan a little more and add some inline comments. Thats a very crucial piece of code and I'm a little nervous about changing it. Also it seems like we might be missing the distinct logic based on the failing test case.
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