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https://issues.apache.org/jira/browse/HIVE-3184?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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N Campbell updated HIVE-3184:
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Summary: remove existing restriction that union must be defined within a
derived table (follow ISO-SQL 2011) (was: remove existing restriction that
union must be defined within a derived table (follow ISO-SQL 2012))
> remove existing restriction that union must be defined within a derived table
> (follow ISO-SQL 2011)
> ---------------------------------------------------------------------------------------------------
>
> Key: HIVE-3184
> URL: https://issues.apache.org/jira/browse/HIVE-3184
> Project: Hive
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 0.8.0
> Reporter: N Campbell
>
> Don't make SQL applications have to wrap the union operation within a derived
> table per the SQL standard. Failing to do so results in Top level UNION is
> not supported currently; use a subquery
> i.e.
> select c1, c2 from cert.tset1 tset1 union all select c1, c2 from cert.tset2
> tset2
> vs
> select * from ( select c1, c2 from cert.tset1 tset1 union all select c1, c2
> from cert.tset2 tset2 ) T
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