PIG-3772: Syntax error when casting an inner schema of a bag and line break involved

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1588952 13f79535-47bb-0310-9956-ffa450edef68
PIG-3894: Datetime function AddDuration, SubtractDuration and all Between
functions don't check for null values in the input tuple
(jennythompson via cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1588974 13f79535-47bb-0310-9956-ffa450edef68