Github user mateiz commented on the pull request:
https://github.com/apache/incubator-spark/pull/539#issuecomment-35172268
See also
http://docs.oracle.com/javase/tutorial/java/javaOO/lambdaexpressions.html#target-types-and-method-arguments
for example.
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. To do so, please top-post your response.
If your project does not have this feature enabled and wishes so, or if the
feature is enabled but not working, please contact infrastructure at
[email protected] or file a JIRA ticket with INFRA.