[SPARK-11086][SPARKR] Use dropFactors column-wise instead of nested loop when createDataFrame#9099

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zero323:SPARK-11086

Commits on Oct 15, 2015

[SPARK-11086] Use dropFactors column-wise instead of nested loop when createDataFrame from a data.frame
zero323
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Commits on Oct 17, 2015

Make sure list columns won't be flattened by mapply
zero323
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Commits on Nov 15, 2015

Add type checking inside createDataFrame
zero323
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