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From "Pengcheng Xiong (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-11409) CBO: Calcite Operator To Hive Operator (Calcite Return Path): add SEL before UNION
Date Thu, 30 Jul 2015 05:58:04 GMT

     [ https://issues.apache.org/jira/browse/HIVE-11409?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pengcheng Xiong updated HIVE-11409:
-----------------------------------
    Attachment: HIVE-11409.01.patch

> 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
>          Components: CBO
>            Reporter: Pengcheng Xiong
>            Assignee: Pengcheng Xiong
>         Attachments: HIVE-11409.01.patch
>
>
> 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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