[SPARK-11781][SPARKR] SparkR has problem in inferring type of raw type.#9769

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sun-rui wants to merge 6 commits intoapache:masterfrom

sun-rui:SPARK-11781

Commits on Nov 23, 2015

[SPARK-11781][SPARKR] SparkR has problem in inferring type of raw type.
Sun Rui
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Minor style fix.
Sun Rui
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Fix R style.
Sun Rui
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Use schema to determine if a collected column can be coerced into an atomic vector.
Sun Rui
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Commits on Nov 27, 2015

Fix R style.
Sun Rui
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Commits on Nov 29, 2015

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Sun Rui
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