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https://issues.apache.org/jira/browse/SPARK-23304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16350428#comment-16350428
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Thomas Graves commented on SPARK-23304:
---------------------------------------

well I guess that give you end # of partitions and not the # it will be 
initially reading

> 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: 2.2.1, 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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