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https://issues.apache.org/jira/browse/SPARK-9241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14987069#comment-14987069
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Michael Armbrust commented on SPARK-9241:
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Thanks for working on this. It look like there are a bunch of TODOs in the PR
still so I'm going to bump this from 1.6.
> 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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