[jira] [Commented] (HIVE-10487) remove non-ISO restriction that projections in a union have identical column names

["Xuefu Zhang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-10487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14513028#comment-14513028 ] 

Xuefu Zhang commented on HIVE-10487:
------------------------------------

Interesting. If the restriction is lifted, what's the column name of the result schema then? Does ISO say anything?

> remove non-ISO restriction that projections in a union have identical column names
> ----------------------------------------------------------------------------------
>
>                 Key: HIVE-10487
>                 URL: https://issues.apache.org/jira/browse/HIVE-10487
>             Project: Hive
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 0.13.1
>            Reporter: N Campbell
>            Priority: Critical
>
> While documented https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Union
> an application should be able to perform a union query where the projections  are union compatible which does not include the projected column names being identical which Hive imposes vs ISO-SQL 20xx.
> i.e 
> rejected
> select c1 from t1 union all select c2 from t2 
> Schema of both sides of union should match. _u1-subquery2
> accepted
> select c1 from t1 union all select c2 c1 from t2 



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