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Generalize pattern for planning hash joins.
This will be helpful for [SPARK-1495](https://issues.apache.org/jira/browse/SPARK-1495) and other cases where we want to have custom hash join implementations but don't want to repeat the logic for finding the join keys. Author: Michael Armbrust <[email protected]> Closes apache#418 from marmbrus/hashFilter and squashes the following commits: d5cc79b [Michael Armbrust] Address @rxin 's comments. 366b6d9 [Michael Armbrust] style fixes 14560eb [Michael Armbrust] Generalize pattern for planning hash joins. f4809c1 [Michael Armbrust] Move common functions to PredicateHelper.
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