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https://issues.apache.org/jira/browse/SPARK-16323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15504403#comment-15504403
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Josh Rosen commented on SPARK-16323:
------------------------------------

FYI I'm going to untarget this from 2.0.1 because this is only a minor 
performance increase and not a bug fix.

> Avoid unnecessary cast when doing integral divide
> -------------------------------------------------
>
>                 Key: SPARK-16323
>                 URL: https://issues.apache.org/jira/browse/SPARK-16323
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Sean Zhong
>            Priority: Minor
>
> This is a follow up of issue SPARK-15776
> *Problem:*
> For Integer divide operator div:
> {code}
> scala> spark.sql("select 6 div 3").explain(true)
> ...
> == Analyzed Logical Plan ==
> CAST((6 / 3) AS BIGINT): bigint
> Project [cast((cast(6 as double) / cast(3 as double)) as bigint) AS CAST((6 / 
> 3) AS BIGINT)#5L]
> +- OneRowRelation$
> ...
> {code}
> For performance reason, we should not do unnecessary cast {{cast(xx as 
> double)}}



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