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https://issues.apache.org/jira/browse/DRILL-4270?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Deneche A. Hakim resolved DRILL-4270.
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Resolution: Fixed
Fixed in 3d0b4b0
> Create a separate WindowFramer that supports the FRAME clause
> -------------------------------------------------------------
>
> Key: DRILL-4270
> URL: https://issues.apache.org/jira/browse/DRILL-4270
> Project: Apache Drill
> Issue Type: Sub-task
> Components: Execution - Relational Operators
> Affects Versions: 1.5.0
> Reporter: Deneche A. Hakim
> Assignee: Deneche A. Hakim
> Fix For: Future
>
>
> Currently most the window functions logic is handled by DefaultFrameTemplate.
> Create a separate CustomFrameTemplate that handles the FRAME clause, this
> should make the code in both classes more focused and will make it easier for
> us to add support for the FRAME clause.
> Aggregations, FIRST_VALUE and LAST_VALUE will be handled by
> CustomFrameTemplate, and all remaining window functions (Ranking, ROW_NUMBER,
> LEAD and LAG) will be handled by DefaultFrameTemplate.
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