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https://issues.apache.org/jira/browse/HIVE-9044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15364220#comment-15364220
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wangwenli commented on HIVE-9044:
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just do basic test local, will add unit test later. now ,want to get some
feedback on this. thks.
> Union input to a join operator poses problem when converting to map join
> [Spark Branch]
> ---------------------------------------------------------------------------------------
>
> Key: HIVE-9044
> URL: https://issues.apache.org/jira/browse/HIVE-9044
> Project: Hive
> Issue Type: Sub-task
> Components: Spark
> Reporter: Xuefu Zhang
> Assignee: wangwenli
> Attachments: hive-9044.1.patch
>
>
> Followup for HIVE-8908. When a join operator has a union input on the big
> table side, we are not able to convert it to map join. The problem seems to
> be a result of the way we handle union in generating plan and the way we
> convert join to map join. We need to find the way to handle this.
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