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https://issues.apache.org/jira/browse/SPARK-21222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16064229#comment-16064229
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Apache Spark commented on SPARK-21222:
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User 'gengliangwang' has created a pull request for this issue:
https://github.com/apache/spark/pull/18429
> Move elimination of Distinct clause from analyzer to optimizer
> --------------------------------------------------------------
>
> Key: SPARK-21222
> URL: https://issues.apache.org/jira/browse/SPARK-21222
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Gengliang Wang
> Priority: Minor
>
> Distinct clause is after MAX/MIN clause
> "Select MAX(distinct a) FROM src from"
> is equivalent of
> "Select MAX(distinct a) FROM src from"
> However, this optimization is implemented in analyzer. It should be in
> optimizer.
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