[SQL] SPARK-1800 Add broadcast hash join operator & associated hints.#1163

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concretevitamin wants to merge 18 commits intoapache:masterfrom

concretevitamin:auto-broadcast-hash-join

Commits on May 11, 2014

Copy records in executeCollect to avoid issues with mutable rows.
marmbrus
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Split out generic logic for hash joins and create two concrete physical operators: BroadcastHashJoin and ShuffledHashJoin.
marmbrus
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A simple strategy that broadcasts tables only when they are found in a configuration hint.
marmbrus
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Commits on May 12, 2014

Formatting.
marmbrus
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Commits on Jun 18, 2014

Commits on Jun 20, 2014

Commits on Jun 25, 2014