[SPARK-18067] Avoid shuffling child if join keys are superset of child's partitioning keys#19054

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Commits on Jan 19, 2018

[SPARK-18067] Avoid shuffling child if join keys are superset of child's partitioning keys
tejasapatil
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bug fix: use Seq instead of Set
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Commits on Jan 20, 2018

rebase + updates
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