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From "Pengcheng Xiong (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-11409) CBO: Calcite Operator To Hive Operator (Calcite Return Path): add SEL before UNION
Date Thu, 30 Jul 2015 05:56:04 GMT
Pengcheng Xiong created HIVE-11409:
--------------------------------------

             Summary: CBO: Calcite Operator To Hive Operator (Calcite Return Path): add SEL
before UNION
                 Key: HIVE-11409
                 URL: https://issues.apache.org/jira/browse/HIVE-11409
             Project: Hive
          Issue Type: Sub-task
            Reporter: Pengcheng Xiong
            Assignee: Pengcheng Xiong


Two purpose: (1) to ensure that the data type of non-primary branch (the 1st branch is the
primary branch) of union can be casted to that of the primary branch; (2) to make UnionProcessor
optimizer work; (3) if the SEL is redundant, it will be removed by IdentidyProjectRemover
optimizer.



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