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Posted to dev@hive.apache.org by "Kevin Wilfong (JIRA)" <ji...@apache.org> on 2012/12/18 01:20:26 UTC
[jira] [Commented] (HIVE-2812) Hive multi group by single reducer
optimization fails when aggregation with no keys followed by query with no
aggregations
[ https://issues.apache.org/jira/browse/HIVE-2812?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13534452#comment-13534452 ]
Kevin Wilfong commented on HIVE-2812:
-------------------------------------
Refreshed.
> Hive multi group by single reducer optimization fails when aggregation with no keys followed by query with no aggregations
> --------------------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-2812
> URL: https://issues.apache.org/jira/browse/HIVE-2812
> Project: Hive
> Issue Type: Bug
> Reporter: Kevin Wilfong
> Assignee: Kevin Wilfong
> Attachments: ASF.LICENSE.NOT.GRANTED--HIVE-2812.D1821.1.patch, HIVE-2812.2.patch.txt, HIVE-2812.D1821.2.patch
>
>
> In multi insert queries where one subquery involves an aggregation with no distinct or group by keys and is followed by a query without any aggregations, like the following, Hive will attempt to add a group by operator for the query without aggregations, causing semantic analysis to fail.
> FROM src
> INSERT OVERWRITE TABLE table1 SELECT count(*)
> INSERT OVERWRITE TABLE table2 SELECT key;
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