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https://issues.apache.org/jira/browse/ARROW-4497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16762514#comment-16762514
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Antoine Pitrou commented on ARROW-4497:
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Yes, unfortunately it's not obvious which behaviour we want.
I'd say reducing NaN to a single canonical version is reasonable. As for
negative zeros it's not obvious. If you get negative zeros in your data they
probably deserve distinct treatment...
> [C++] Determine how we want to handle hashing of floating point edge cases
> --------------------------------------------------------------------------
>
> Key: ARROW-4497
> URL: https://issues.apache.org/jira/browse/ARROW-4497
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Micah Kornfield
> Priority: Major
> Labels: analytics
> Fix For: 0.14.0
>
>
> We should document expected behavior or implement improvements to hashing
> floating point code:
> 1. -0.0 and 0.0 (should these be collapsed to 0.0)
> 2. NaN (Should we reduce to a single canonical version).
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