Shivaram Venkataraman created SPARK-6820:
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             Summary: Convert NAs to null type in SparkR DataFrames
                 Key: SPARK-6820
                 URL: https://issues.apache.org/jira/browse/SPARK-6820
             Project: Spark
          Issue Type: New Feature
          Components: SparkR, SQL
            Reporter: Shivaram Venkataraman


While converting RDD or local R DataFrame to a SparkR DataFrame we need to 
handle missing values or NAs.
We should convert NAs to SparkSQL's null type to handle the conversion correctly



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