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https://issues.apache.org/jira/browse/HIVE-19770?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16508890#comment-16508890
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Vineet Garg commented on HIVE-19770:
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Also found an existing bug (HIVE-19863) which is fixed by this patch.
> Support for CBO for queries with multiple same columns in select
> ----------------------------------------------------------------
>
> Key: HIVE-19770
> URL: https://issues.apache.org/jira/browse/HIVE-19770
> Project: Hive
> Issue Type: Improvement
> Reporter: Vineet Garg
> Assignee: Vineet Garg
> Priority: Major
> Attachments: HIVE-19770.1.patch, HIVE-19770.2.patch
>
>
> Currently queries such as {code:sql} select a,a from t1 where b > 10 {code}
> are not supported for CBO.
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