HIVE-8811: Dynamic partition pruning can result in NPE during query compilation (Gunther Hagleitner, reviewed by Gopal V)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.14@1638686 13f79535-47bb-0310-9956-ffa450edef68
HIVE-8715 : Hive 14 upgrade scripts can fail for statistics if database was created using auto-create
 ADDENDUM (Sergey Shelukhin, reviewed by Ashutosh Chauhan and Gunther Hagleitner)

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HIVE-8805: CBO skipped due to SemanticException: Line 0:-1 Both left and right aliases encountered in JOIN 'avg_cs_ext_discount_amt' (Laljo John Pullokkaran via Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.14@1638695 13f79535-47bb-0310-9956-ffa450edef68