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https://issues.apache.org/jira/browse/SPARK-38681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17514064#comment-17514064
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Apache Spark commented on SPARK-38681:
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User 'eejbyfeldt' has created a pull request for this issue:
https://github.com/apache/spark/pull/36004
> Support nested generic case classes
> -----------------------------------
>
> Key: SPARK-38681
> URL: https://issues.apache.org/jira/browse/SPARK-38681
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.3.0, 3.4.0
> Reporter: Emil Ejbyfeldt
> Priority: Major
>
> Spark fail to derive schemas when using nested case class with generic
> parameters.
> Example
> {code:java}
> case class GenericData[A](
> genericField: A)
> {code}
> Will derive a correct schema for `GenericData[Int]` but if the classes are
> nested e.g.
> {code:java}
> case class NestedGeneric[T](
> generic: GenericData[T])
> {code}
> it will fail to derive a schema for `NestedGeneric[Int]`.
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