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https://issues.apache.org/jira/browse/SPARK-18122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15673246#comment-15673246
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Apache Spark commented on SPARK-18122:
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User 'windpiger' has created a pull request for this issue:
https://github.com/apache/spark/pull/15918
> Fallback to Kryo for unknown classes in ExpressionEncoder
> ---------------------------------------------------------
>
> Key: SPARK-18122
> URL: https://issues.apache.org/jira/browse/SPARK-18122
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.0.1
> Reporter: Michael Armbrust
> Priority: Critical
>
> In Spark 2.0 we fail to generate an encoder if any of the fields of the class
> are not of a supported type. One example is {{Option\[Set\[Int\]\]}}, but
> there are many more. We should give the user the option to fall back on
> opaque kryo serialization in these cases for subtrees of the encoder, rather
> than failing.
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