HIVE-6641 : optimized HashMap keys won't work correctly with decimals (Sergey Shelukhin, reviewed by Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.13@1579002 13f79535-47bb-0310-9956-ffa450edef68
HIVE-6639. Vectorization: Partition column names are not picked up. (reviewed by Vikram)

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HIVE-6660: HiveServer2 running in non-http mode closes server socket for an SSL connection after the 1st request	(Prasad Mujumdar, reviewed by Thejas Nair and Vaibhav Gumashta)

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