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https://issues.apache.org/jira/browse/SPARK-12578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15076631#comment-15076631
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Apache Spark commented on SPARK-12578:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/10557
> Parser should not silently ignore the distinct keyword used in an aggregate
> function when OVER clause is used
> -------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-12578
> URL: https://issues.apache.org/jira/browse/SPARK-12578
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
>
> Right now, when an aggregate function is used as window function and DISTINCT
> is used, Hive's parser silently drop the DISTINCT keyword. It is fine to not
> support DISTINCT aggregation in window function. But, it is not good to
> silently drop the keyword.
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