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https://issues.apache.org/jira/browse/HIVE-19770?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16560637#comment-16560637
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Ashutosh Chauhan commented on HIVE-19770:
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[~vgarg] Can you add test case from HIVE-20215 in this patch now that this
patch incorporates it. Also, can you create follow-up jiras for perf issues.
+1 pending tests.
> 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,
> HIVE-19770.3.patch, HIVE-19770.4.patch, HIVE-19770.5.patch,
> HIVE-19770.6.patch, HIVE-19770.7.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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