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https://issues.apache.org/jira/browse/HIVE-3430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13590321#comment-13590321
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Lianhui Wang commented on HIVE-3430:
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also should consider the following query:
SELECT a.key, a.cnt, b.key, a.cnt
FROM
(SELECT x.key as key, count(x.value) AS cnt FROM src x group by x.key) a
JOIN src b
ON (a.key = b.key);
> 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
> Affects Versions: 0.10.0
> Reporter: Namit Jain
>
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