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Posted to dev@hive.apache.org by "Pengcheng Xiong (JIRA)" <ji...@apache.org> on 2015/07/30 07:56:04 UTC

[jira] [Created] (HIVE-11409) CBO: Calcite Operator To Hive Operator (Calcite Return Path): add SEL before UNION

Pengcheng Xiong created HIVE-11409:
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             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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