Groovy -> Works in Tez when additional changes are made to build.xml and bin/pig (NOT included in my patch, let me know if you want me to add). I think Groovy is broken in MR Pig at the moment and that no one can use it. To make it work in Tez, I have a hack in TezPlanContainer.java that specifically looks for Groovy files. Let me know if you think we should keep this line or perhaps remove it.
Just to note, one way to fix MR Pig would be to add the Groovy files to DistributedCache. Diffs