[jira] [Resolved] (SPARK-17617) Remainder(%) expression.eval returns incorrect result

["Wenchen Fan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-17617?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan resolved SPARK-17617.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 2.1.0

Issue resolved by pull request 15171
[https://github.com/apache/spark/pull/15171]

> Remainder(%) expression.eval returns incorrect result
> -----------------------------------------------------
>
>                 Key: SPARK-17617
>                 URL: https://issues.apache.org/jira/browse/SPARK-17617
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>            Reporter: Sean Zhong
>              Labels: correctness
>             Fix For: 2.1.0
>
>
> h2.Problem
> Remainder(%) expression returns incorrect result when using expression.eval to calculate the result. expression.eval is called in case like constant folding.
> {code}
> scala> -5083676433652386516D  % 10
> res19: Double = -6.0
> // Wrong answer with eval!!!
> scala> Seq("-5083676433652386516D").toDF.select($"value" % 10).show
> |(value % 10)|
> +------------+
> |         0.0|
> +------------+
> // Triggers codegen, will  not do constant folding
> scala> sc.makeRDD(Seq("-5083676433652386516D")).toDF.select($"value" % 10).show
> +------------+
> |(value % 10)|
> +------------+
> |        -6.0|
> +------------+
> {code}
> Behavior of postgres:
> {code}
> seanzhong=# select -5083676433652386516.0  % 10;
>  ?column? 
> ----------
>      -6.0
> (1 row)
> {code}



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