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https://issues.apache.org/jira/browse/HIVE-4186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13603816#comment-13603816
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Ashutosh Chauhan commented on HIVE-4186:
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[~rhbutani] Can you add testcase in a .q file and add it in your patch ?
> 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
>
>
> 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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