PIG-3355: ColumnMapKeyPrune bug with distinct operator (jeremykarn via aniket486)

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1494026 13f79535-47bb-0310-9956-ffa450edef68
PIG-3354: UDF example does not handle nulls

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1496231 13f79535-47bb-0310-9956-ffa450edef68
PIG-3361: Improve Hadoop version detection logic for Pig unit test

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1496241 13f79535-47bb-0310-9956-ffa450edef68
PIG-3364: Case expression fails with an even number of when branches (cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1496966 13f79535-47bb-0310-9956-ffa450edef68
PIG-3015: Rewrite of AvroStorage (jadler via cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1497954 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk' of git://git.apache.org/pig into tez_on_pig
separated map config to MapOper