N Campbell created HIVE-10487:
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Summary: 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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