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https://issues.apache.org/jira/browse/HIVE-2195?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vaibhav Aggarwal resolved HIVE-2195.
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Resolution: Not A Problem
> Hive queries hangs with first stage job created with zero mappers and 1
> reducer,
> ----------------------------------------------------------------------------------
>
> Key: HIVE-2195
> URL: https://issues.apache.org/jira/browse/HIVE-2195
> Project: Hive
> Issue Type: Bug
> Affects Versions: 0.7.0
> Reporter: vitthal (Suhas) Gogate
> Assignee: Vaibhav Aggarwal
>
> This happens when query aggregate data w/ predicate selecting bunch of
> non-existing data partitions.
> e,g, Table XXX has five columns, A (int), B (int), C(string), date (int) and
> hour (int), where date/hour are the partition columns,
> select cast((100*date+hour) as BIGINT) as datehour, sum(A) as sumA,
> sum(B) as sumB from XXX where date>=20110925 and C='test' group by date, hour
> order by datehour
> In the above query, make a note that selected date partition range does not
> exists in hive table i.e. no date partitions for date>=20110925
> The above query hangs with the first map reduce job it creates, with zero
> mappers and 1 reducer.
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