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Date: Sun, 17 Mar 2013 21:55:15 +0000 (UTC)
From: "Harish Butani (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <JIRA.12637250.1363375087569.931.1363557315811@arcas>
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Subject: [jira] [Commented] (HIVE-4186) NPE in ReduceSinkDeDuplication
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    [ https://issues.apache.org/jira/browse/HIVE-4186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13604763#comment-13604763 ] 

Harish Butani commented on HIVE-4186:
-------------------------------------

its attached.
                
> NPE in ReduceSinkDeDuplication
> ------------------------------
>
>                 Key: HIVE-4186
>                 URL: https://issues.apache.org/jira/browse/HIVE-4186
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Processor
>            Reporter: Harish Butani
>         Attachments: HIVE-4186.1.patch.txt, HIVE-4186.2.patch.txt
>
>
> When you have a sequence of RedueSinks on constants you get this error:
> {noformat}
> java.lang.NullPointerException
> 	at org.apache.hadoop.hive.ql.optimizer.ReduceSinkDeDuplication$ReduceSinkDeduplicateProcFactory$ReducerReducerProc.getPartitionAndKeyColumnMapping(ReduceSinkDeDuplication.java:416)
> {noformat}
> The e.g. to generate this si:
> {noformat}
> select p_name from (select p_name from part distribute by 1 sort by 1) p distribute by 1 sort by 1
> {noformat}
> Sorry for the contrived e.g., but this actually happens when we stack windowing clauses (see PTF-Windowing branch)

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