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https://issues.apache.org/jira/browse/SPARK-12131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15038121#comment-15038121
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Apache Spark commented on SPARK-12131:
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User 'liancheng' has created a pull request for this issue:
https://github.com/apache/spark/pull/10133
> Cannot create ExpressionEncoder for Array[T] where T is a nested class
> ----------------------------------------------------------------------
>
> Key: SPARK-12131
> URL: https://issues.apache.org/jira/browse/SPARK-12131
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.6.0
> Reporter: Cheng Lian
> Assignee: Cheng Lian
>
> The following snippet reproduces this issue under {{spark-shell}}:
> {noformat}
> import sqlContext._
> case class N(i: Int)
> case class T(a: Array[N])
> val ds = Seq(T(Array(N(1)))).toDS
> ds.show()
> {noformat}
> Note that, classes defined in Scala REPL are inherently nested.
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