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https://issues.apache.org/jira/browse/SPARK-12816?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Armbrust resolved SPARK-12816.
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Resolution: Fixed
Fix Version/s: 2.0.0
Issue resolved by pull request 10749
[https://github.com/apache/spark/pull/10749]
> Schema generation for type aliases does not work
> ------------------------------------------------
>
> Key: SPARK-12816
> URL: https://issues.apache.org/jira/browse/SPARK-12816
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Reporter: Jakob Odersky
> Fix For: 2.0.0
>
>
> Related to the second part of SPARK-12777.
> Assume the following:
> {code}
> case class Container[A](a: A)
> type IntContainer = Container[Int]
> {code}
> Generating a schema with
> {code}org.apache.spark.sql.catalyst.ScalaReflection.schemaFor[IntContainer]{code}
> fails miserably with {{NoSuchElementException: : head of empty list
> (ScalaReflection.scala:504)}} (the same exception as described in the related
> issues)
> Since {{schemaFor}} is called whenever a schema is implicitly needed,
> {{Datasets}} cannot be created from certain aliased types.
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