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https://issues.apache.org/jira/browse/HIVE-27115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17696327#comment-17696327
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Yi Zhang commented on HIVE-27115:
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[~rajesh.balamohan] can you review the pr? thank you!
> HiveInputFormat column project push down wrong fields (MR)
> ----------------------------------------------------------
>
> Key: HIVE-27115
> URL: https://issues.apache.org/jira/browse/HIVE-27115
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Affects Versions: 3.1.3, 4.0.0-alpha-2
> Reporter: Yi Zhang
> Assignee: Yi Zhang
> Priority: Major
> Labels: pull-request-available
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> For query such as
> select * from (
> select r_name from r
> union all
> select t_name from t
> ) unioned
>
> in MR execution, when column project push down for splits, t_name gets pushed
> down to table r.
>
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