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https://issues.apache.org/jira/browse/HIVE-3430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13448651#comment-13448651
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Namit Jain commented on HIVE-3430:
----------------------------------
Consider the following query:
select * from
(
select c.value, count(1) as cnt from
(
select b.key, b.value from
(select key, length(value) from T1 where ds = '1') a
join
T2 b on b.ds = '1' and a.key = b.key
) c
group by c.value
) d
join
(select value, count(1) as cnt from T2 c where c.ds = '1' group by value) e
on d.value = e.value;
Every join and group by above has a separate map-reduce job.
> group by followed by join with the same key should be optimized
> ---------------------------------------------------------------
>
> Key: HIVE-3430
> URL: https://issues.apache.org/jira/browse/HIVE-3430
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Namit Jain
>
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