PIG-3648: Make the sample size for RandomSampleLoader configurable (cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1569490 13f79535-47bb-0310-9956-ffa450edef68
PIG-3747: Update skewed join documentation (cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1569494 13f79535-47bb-0310-9956-ffa450edef68
PIG-3746: NPE is thrown if Pig fails before PigStats is intialized (cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1569497 13f79535-47bb-0310-9956-ffa450edef68
Move PIG-3657 to 0.12.1 in CHANGES logs


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1569511 13f79535-47bb-0310-9956-ffa450edef68