[SPARK-13523] [SQL] Reuse exchanges in a query#11403

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davies wants to merge 6 commits into

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Commits on Mar 4, 2016

WIP: reuse exchanges in a query
Davies Liu
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fix style
Davies Liu
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fix flakyness of sameResult
Davies Liu
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Commits on Mar 8, 2016

Merge branch 'master' of github.com:apache/spark into dedup
Davies Liu
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address comments
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Commits on Mar 9, 2016

address comments
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committed