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https://issues.apache.org/jira/browse/HIVE-5123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13770402#comment-13770402
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cyril liao commented on HIVE-5123:
----------------------------------
SELECT p_day,
count(*)
from
(SELECT p_day ,uid,poid
FROM t_app_bd_stat
WHERE p_day >=20130910
AND p_day<=20130917
AND newuser =1
GROUP BY p_day,uid,poid) tmp
GROUP BY p_day
ORDER BY p_day ASC
the result get a lot of lines with a same p_day value.
> group by on a same key producing wrong result
> ---------------------------------------------
>
> Key: HIVE-5123
> URL: https://issues.apache.org/jira/browse/HIVE-5123
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.11.0
> Reporter: cyril liao
>
> grouping by on a same key twice will run a single mapreduce-job,producing
> wrong result.
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