Fixed tests: groupby2_multi_distinct, groupby3_map_skew_multi_distinct, print_header
HIVE-4970 BinaryConverter does not respect null (Mark Wagner via egc)

Submitted by: Mark Wagner
Reviewed by: Edward Capriolo

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1510263 13f79535-47bb-0310-9956-ffa450edef68
HIVE-4913 : Put deterministic ordering in the top-K ngrams output of UDF context_ngrams() (Xuefu Zhang via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1512590 13f79535-47bb-0310-9956-ffa450edef68
HIVE-5149 : ReduceSinkDeDuplication can pick the wrong partitioning columns (Yin Huai via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1519805 13f79535-47bb-0310-9956-ffa450edef68

Conflicts:

	ql/src/java/org/apache/hadoop/hive/ql/optimizer/correlation/ReduceSinkDeDuplication.java