PIG-4062: Add ascending order option to builtin TOP function (raj171 via cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1612331 13f79535-47bb-0310-9956-ffa450edef68
PIG-4065: Fix failing unit tests in Tez (rohini)

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1612455 13f79535-47bb-0310-9956-ffa450edef68