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https://issues.apache.org/jira/browse/SPARK-6820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14546451#comment-14546451
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Apache Spark commented on SPARK-6820:
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User 'hqzizania' has created a pull request for this issue:
https://github.com/apache/spark/pull/6190
> 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
> Assignee: Qian Huang
> Priority: Critical
>
> 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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