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From "Thomas Graves (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-23304) Spark SQL coalesce() against hive not working
Date Thu, 01 Feb 2018 23:23:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-23304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16349480#comment-16349480
] 

Thomas Graves commented on SPARK-23304:
---------------------------------------

I just ran the query (show()) and saw the # of partitions. 

spark23_oldorc_explain_convermetastoreorcfalse.txt is the explain with  --conf spark.sql.orc.impl=hive
--conf spark.sql.orc.filterPushdown=false --conf spark.sql.hive.convertMetastoreOrc=false

 

 

> Spark SQL coalesce() against hive not working
> ---------------------------------------------
>
>                 Key: SPARK-23304
>                 URL: https://issues.apache.org/jira/browse/SPARK-23304
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.3.0
>            Reporter: Thomas Graves
>            Assignee: Xiao Li
>            Priority: Major
>         Attachments: spark22_oldorc_explain.txt, spark23_oldorc_explain.txt, spark23_oldorc_explain_convermetastoreorcfalse.txt
>
>
> The query below seems to ignore the coalesce. This is running spark 2.2 or spark 2.3
against hive, which is reading orc:
>  
>  Query:
>  spark.sql("SELECT COUNT(DISTINCT(something)) FROM sometable WHERE dt >= '20170301'
AND dt <= '20170331' AND something IS NOT NULL").coalesce(160000).show()
>   



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