HIVE-27806 : Backport of HIVE-20536, HIVE-20632, HIVE-20511, HIVE-20560, HIVE-20631, HIVE-20637, HIVE-20609, HIVE-20439 #4808
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JIRA link - HIVE-27806
Backports HIVE-20536, HIVE-20632, HIVE-20511, HIVE-20560, HIVE-20631, HIVE-20637, HIVE-20609, HIVE-20439
All are clean cherry picks except the last ticket (HIVE-20439). There were merge conflicts so had to resolve them first and then commit the output as Test fix commit. The fixed tests are properly inline with HIVE-20439 (orc_llap.q and join32_lessSize.q)