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https://issues.apache.org/jira/browse/SPARK-21222?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-21222:
-----------------------------------
Assignee: Gengliang Wang
> 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
> Assignee: Gengliang Wang
> Priority: Minor
> Fix For: 2.3.0
>
>
> Move elimination of Distinct clause from analyzer to optimizer
> Distinct clause is useless after MAX/MIN clause. For example,
> "Select MAX(distinct a) FROM src from"
> is equivalent of
> "Select MAX(a) FROM src from"
> However, this optimization is implemented in analyzer. It should be in
> optimizer.
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