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[SPARK-2052] [SQL] Add optimization for CaseConversionExpression's.#990

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ueshin wants to merge 6 commits intoapache:masterfrom
ueshin:issues/SPARK-2052
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[SPARK-2052] [SQL] Add optimization for CaseConversionExpression's.#990
ueshin wants to merge 6 commits intoapache:masterfrom
ueshin:issues/SPARK-2052