[SQL] SPARK-6489: Optimize lateral view with explode to not unnecessary columns.#5358

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dreamquster wants to merge 7 commits intoapache:masterfrom

dreamquster:spark-explode-optimize

Commits on Apr 4, 2015

[SQL] SPARK-6489: Optimize lateral view with explode to not read unnecessary columns
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[SQL] SPARK-6489: adding test files
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Commits on Apr 8, 2015

SPARK-6489: explode optimize add project child plan in unittest
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