SPARK-3462 push down filters and projections into Unions#2345

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Commits on Sep 10, 2014

SPARK-3462 push down filters and projections into Unions
Cody Koeninger
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Commits on Sep 11, 2014

SPARK-3462 add tests, handle compatible schema with different aliases, per marmbrus feedback
Cody Koeninger
committed
SPARK-3462 remove now-unused parameter
Cody Koeninger
committed