[jira] [Created] (SPARK-12816) Schema generation for type aliases does not work

["Jakob Odersky (JIRA)" <ji...@apache.org>]

Jakob Odersky created SPARK-12816:
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             Summary: 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


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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