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Posted to issues@spark.apache.org by "Sean Owen (JIRA)" <ji...@apache.org> on 2015/12/09 16:15:11 UTC

[jira] [Updated] (SPARK-12213) Query with only one distinct should not having on expand

     [ https://issues.apache.org/jira/browse/SPARK-12213?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen updated SPARK-12213:
------------------------------
    Component/s: SQL

> Query with only one distinct should not having on expand
> --------------------------------------------------------
>
>                 Key: SPARK-12213
>                 URL: https://issues.apache.org/jira/browse/SPARK-12213
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Davies Liu
>
> Expand will double the number of records, slow down projection and aggregation, it's better to generate a plan without Expand for a query with only one distinct (for example, ss_max in TPCDS)



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