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https://issues.apache.org/jira/browse/HIVE-796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12752919#action_12752919
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Zheng Shao commented on HIVE-796:
---------------------------------
Code looks good. Can you add a test?
> RCFile results missing columns from UNION ALL
> ---------------------------------------------
>
> Key: HIVE-796
> URL: https://issues.apache.org/jira/browse/HIVE-796
> Project: Hadoop Hive
> Issue Type: Bug
> Reporter: Ning Zhang
> Assignee: He Yongqiang
> Attachments: hive-796-2009-08-26.patch
>
>
> create table tt(a int, b string, c string) row format serde
> "org.apache.hadoop.hive.serde2.column.ColumnarSerDe" stored as RCFile;
> load data:
> 1 b c
> 2 e f
> 3 i j
> select * from (
> select b as cola from tt
> union all
> select c as cola from tt) s;
> results:
> NULL
> b
> NULL
> e
> NULL
> i
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