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https://issues.apache.org/jira/browse/SPARK-17506?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen updated SPARK-17506:
------------------------------
    Assignee: Jiang Xingbo

> Improve the check double values equality rule
> ---------------------------------------------
>
>                 Key: SPARK-17506
>                 URL: https://issues.apache.org/jira/browse/SPARK-17506
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL, Tests
>            Reporter: Jiang Xingbo
>            Assignee: Jiang Xingbo
>            Priority: Minor
>             Fix For: 2.1.0
>
>
> In `ExpressionEvalHelper`, we check the equality between two double values by 
> comparing whether the expected value is within the range [target - tolerance, 
> target + tolerance], but this can cause a negative false when the compared 
> numerics are very large. 
> For example´╝Ü
> {code}
> val1 = 1.6358558070241E306
> val2 = 1.6358558070240974E306
> ExpressionEvalHelper.compareResults(val1, val2)
> false
> {code}
> In fact, val1 and val2 are but with different precisions, we should tolerant 
> this case.



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