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https://issues.apache.org/jira/browse/SPARK-21073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16047579#comment-16047579
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Apache Spark commented on SPARK-21073:
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User 'darionyaphet' has created a pull request for this issue:
https://github.com/apache/spark/pull/18287
> Support map_keys and map_values functions in DataSet
> ----------------------------------------------------
>
> Key: SPARK-21073
> URL: https://issues.apache.org/jira/browse/SPARK-21073
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 2.0.2, 2.1.1
> Reporter: darion yaphet
>
> Add *map_keys* to get keys from a MapType cloumn and *map_values* to get
> values from a MapType column.
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