Github user kanzhang commented on a diff in the pull request:
https://github.com/apache/spark/pull/1338#discussion_r15296619
--- Diff:
core/src/main/scala/org/apache/spark/api/python/PythonHadoopUtil.scala ---
@@ -31,13 +31,14 @@ import org.apache.spark.annotation.Experimental
* transformation code by overriding the convert method.
*/
@Experimental
-trait Converter[T, U] extends Serializable {
+trait Converter[T, +U] extends Serializable {
--- End diff --
@mateiz thanks, Matei. I saw it but I couldn't believe that was the reason
:-). I added the + sign because some of our converters have more specific types
like [Any, Writable] and the compiler complains when assigning them to where
[Any, Any] is required. I don't have a strong preference here and could change
them back to [Any, Any]. Let me know.
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