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Posted to issues@spark.apache.org by "Gengliang Wang (JIRA)" <ji...@apache.org> on 2017/06/27 04:11:00 UTC

[jira] [Created] (SPARK-21222) Move elimination of Distinct clause from analyzer to optimizer

Gengliang Wang created SPARK-21222:
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             Summary: 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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