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https://issues.apache.org/jira/browse/SPARK-10050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14699863#comment-14699863
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Shivaram Venkataraman commented on SPARK-10050:
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I think the comments in https://sparkr.atlassian.net/browse/SPARKR-230 are
useful. For MapType we will need to support deserializing maps with string keys
to `env`. If there are maps with other keys we can do one of two things on the
Scala side (a) use toString to convert key to string (b) print an error saying
maps with non-string keys are not supported
> Support collecting data of MapType in DataFrame
> -----------------------------------------------
>
> Key: SPARK-10050
> URL: https://issues.apache.org/jira/browse/SPARK-10050
> Project: Spark
> Issue Type: Sub-task
> Components: SparkR
> Reporter: Sun Rui
>
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