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https://issues.apache.org/jira/browse/SPARK-17414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16130852#comment-16130852
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Alexander Bessonov commented on SPARK-17414:
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Fixed in SPARK-21204
> Set type is not supported for creating data frames
> --------------------------------------------------
>
> Key: SPARK-17414
> URL: https://issues.apache.org/jira/browse/SPARK-17414
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Emre Colak
> Priority: Minor
>
> For a case class that has a field of type Set, createDataFrame() method
> throws an exception saying "Schema for type Set is not supported". Exception
> is raised by the org.apache.spark.sql.catalyst.ScalaReflection class where
> Array, Seq and Map types are supported but Set is not. It would be nice to
> support Set here by default instead of having to write a custom Encoder.
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