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https://issues.apache.org/jira/browse/HIVE-3426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13466419#comment-13466419
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Zhenxiao Luo commented on HIVE-3426:
------------------------------------
TS -- FIL -- SEL
\
\
UNION
/
/
TS -- TIL -- SEL
Needs to be updated into:
TS --FIL -- SEL
And, the FIL condition needs to be updated,
eg.
select key from srcpart where key = 484
union all
select key from srcpart where key = 409
should be updated into:
select key from srcpart where key = 484 OR key = 409
> union with same source should be optimized
> ------------------------------------------
>
> Key: HIVE-3426
> URL: https://issues.apache.org/jira/browse/HIVE-3426
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Namit Jain
>
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