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https://issues.apache.org/jira/browse/SPARK-20747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16199840#comment-16199840
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Hyukjin Kwon commented on SPARK-20747:
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(I was looking through JIRAs) I also tested this. Looks we support this.
> Distinct in Aggregate Functions
> -------------------------------
>
> Key: SPARK-20747
> URL: https://issues.apache.org/jira/browse/SPARK-20747
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Xiao Li
>
> {noformat}
> AVG ([DISTINCT]|[ALL] <numeric expression>)
> MAX ([DISTINCT]|[ALL] <expression>)
> MIN ([DISTINCT]|[ALL] <expression>)
> SUM ([DISTINCT]|[ALL] <numeric_expression>)
> {noformat}
> Except COUNT, the DISTINCT clause is not supported by Spark SQL
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