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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 resolved SPARK-17506.
-------------------------------
Resolution: Fixed
Fix Version/s: 2.1.0
Issue resolved by pull request 15059
[https://github.com/apache/spark/pull/15059]
> 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
> 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：
> {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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