[SPARK-4945] [SQL] Add overwrite option support for SchemaRDD.saveAsParquetFile#3780

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chenghao-intel wants to merge 3 commits intoapache:masterfrom

chenghao-intel:saveAsParquetFile

Commits on Jan 12, 2015

Support overwrite option in saveAsParquetFile
chenghao-intel
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Update the comment and fix bug for removing the existed path if overwrite specified
chenghao-intel
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Commits on Jan 21, 2015

code style issues
chenghao-intel
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