PIG-2629: Wrong Usage of Scalar which is null causes high namenode operation (rohini)

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1548342 13f79535-47bb-0310-9956-ffa450edef68
PIG-3607: PigRecordReader should report progress for each inputsplit processed (rohini)

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1548344 13f79535-47bb-0310-9956-ffa450edef68
PIG-3612: Storing schema does not work cross cluster with PigStorage and JsonStorage (rohini)

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1548345 13f79535-47bb-0310-9956-ffa450edef68