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https://issues.apache.org/jira/browse/SPARK-9241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14951212#comment-14951212
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Josh Rosen commented on SPARK-9241:
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[~yhuai], [~rxin], would you like to update this ticket based on recent
discussions?
> Supporting multiple DISTINCT columns
> ------------------------------------
>
> Key: SPARK-9241
> URL: https://issues.apache.org/jira/browse/SPARK-9241
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Yin Huai
> Priority: Critical
>
> Right now the new aggregation code path only support a single distinct column
> (you can use it in multiple aggregate functions in the query). We need to
> support multiple distinct columns by generating a different plan for handling
> multiple distinct columns (without change aggregate functions).
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