[
https://issues.apache.org/jira/browse/SPARK-21222?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Wenchen Fan resolved SPARK-21222.
---------------------------------
Resolution: Fixed
Fix Version/s: 2.3.0
Issue resolved by pull request 18429
[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
> 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.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org
For additional commands, e-mail: issues-h...@spark.apache.org
