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https://issues.apache.org/jira/browse/HIVE-11409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14649301#comment-14649301
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Jesus Camacho Rodriguez commented on HIVE-11409:
------------------------------------------------
+1
> 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, HIVE-11409.02.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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