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https://issues.apache.org/jira/browse/HIVE-8681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14192481#comment-14192481
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Pengcheng Xiong commented on HIVE-8681:
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As per [~jpullokkaran]'s request, include [~vikram.dixit] in the discussion.
And, an important assumption here is that, every physical operator (SEL, RS,
JOIN (include hashtablesinkop, join, mapjoinop, mergejoinop, semijoin), FIL,
GRY, FS, UNION) that is included in the explain can find its corresponding
logical operator. If it is not found, its internal column names will be used.
> CBO: Column names are missing from join expression in Map join with CBO
> enabled
> -------------------------------------------------------------------------------
>
> Key: HIVE-8681
> URL: https://issues.apache.org/jira/browse/HIVE-8681
> Project: Hive
> Issue Type: Improvement
> Reporter: Pengcheng Xiong
> Assignee: Pengcheng Xiong
> Attachments: HIVE-8681.1.patch
>
>
> On Hive 14 when CBO is enabled the column names are missing from the join
> expression. Rather than to use external names "key", "value", some internal
> names such as "_col0" or "_col1" are used. For map join with more than two
> tables it is very hard to figure the actual join order. In this patch, I am
> going to address this issue not only for join but also for all the other
> operators. And it will also be addressed in not only CLI but also TEZ
> environment.
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