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https://issues.apache.org/jira/browse/HIVE-4073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13589129#comment-13589129
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Brock Noland commented on HIVE-4073:
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[~ashutoshc]
When OVER() with no partition column is specified, we will partition by some
constant. In that case, there is only a need for a single reducer. Should this
change force the single reducer? Not sure how how I would do that yet.
> Make partition by optional in over clause
> -----------------------------------------
>
> Key: HIVE-4073
> URL: https://issues.apache.org/jira/browse/HIVE-4073
> Project: Hive
> Issue Type: Bug
> Components: PTF-Windowing
> Reporter: Ashutosh Chauhan
> Assignee: Brock Noland
>
> select s, sum( i ) over() from tt; should work.
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