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https://issues.apache.org/jira/browse/HIVE-15520?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aihua Xu updated HIVE-15520:
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Attachment: HIVE-15520.3.patch
patch-3: continue to work on affected unit tests. One change is: before,
Lead/Lag is operating on defined window, while it's reasonable to be on
partition so that it matches the databases, like Postgres and function call
like sum(lag(f)) will get more meaningful result.
> Improve the sum performance for Range based window
> --------------------------------------------------
>
> Key: HIVE-15520
> URL: https://issues.apache.org/jira/browse/HIVE-15520
> Project: Hive
> Issue Type: Sub-task
> Components: PTF-Windowing
> Reporter: Aihua Xu
> Assignee: Aihua Xu
> Attachments: HIVE-15520.1.patch, HIVE-15520.2.patch,
> HIVE-15520.3.patch
>
>
> Currently streaming process is not supported for range based windowing. Thus
> sum( x ) over (partition by y order by z) is O(n^2) running time.
> Investigate the possibility of streaming support.
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