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https://issues.apache.org/jira/browse/DRILL-3296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14588384#comment-14588384
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Sean Hsuan-Yi Chu commented on DRILL-3296:
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https://reviews.apache.org/r/35525/
> Group By Union Distinct fails at planning
> -----------------------------------------
>
> Key: DRILL-3296
> URL: https://issues.apache.org/jira/browse/DRILL-3296
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization
> Reporter: Sean Hsuan-Yi Chu
> Assignee: Sean Hsuan-Yi Chu
>
> For example,
> select n_nationkey from
> (select n_nationkey from cp.`tpch/nation.parquet`
> union select n_nationkey from cp.`tpch/nation.parquet`)
> group by n_nationkey
> Will fail. Actually, this issue was already resolved in Calcite-675. After
> picking this commit, this issue will go away.
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