PIG-2132: [Piggybank] MIN and MAX functions should ignore nulls (rekhajoshm via cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1546197 13f79535-47bb-0310-9956-ffa450edef68
PIG-3576: NPE due to PIG-3549 when job never gets submitted (lbendig via cheolsoo)

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1546204 13f79535-47bb-0310-9956-ffa450edef68
PIG-3566: Cannot set useMatches of REGEX_EXTRACT_ALL and REGEX_EXTRACT (nezihyigitbasi via cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1546243 13f79535-47bb-0310-9956-ffa450edef68
PIG-3590: remove PartitionFilterOptimizer from trunk (aniket486)

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1546253 13f79535-47bb-0310-9956-ffa450edef68