Jakob Odersky created SPARK-13929:
-------------------------------------
Summary: Use Scala reflection for UDFs
Key: SPARK-13929
URL: https://issues.apache.org/jira/browse/SPARK-13929
Project: Spark
Issue Type: Bug
Components: SQL
Reporter: Jakob Odersky
Priority: Minor
{{ScalaReflection}} uses native Java reflection for User Defined Types which
would fail if such types are not plain Scala classes that map 1:1 to Java.
Consider the following extract (from here
https://github.com/apache/spark/blob/92024797a4fad594b5314f3f3be5c6be2434de8a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala#L376
):
{code}
case t if Utils.classIsLoadable(className) &&
Utils.classForName(className).isAnnotationPresent(classOf[SQLUserDefinedType])
=>
val udt =
Utils.classForName(className).getAnnotation(classOf[SQLUserDefinedType]).udt().newInstance()
//...
{code}
If {{t}}'s runtime class is actually synthetic (something that doesn't exist in
Java and hence uses a dollar sign internally), such as nested classes or
package objects, the above code will fail.
Currently there are no known use-cases of synthetic user-defined types (hence
the minor priority), however it would be best practice to remove plain Java
reflection and rely on Scala reflection instead.
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