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https://issues.apache.org/jira/browse/ARROW-12861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17351077#comment-17351077
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Ian Cook commented on ARROW-12861:
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[~edponce] I think sign(0.0) should return 0 regardless of the sign of the
floating point zero, for two reasons: (a) This is what Python, R, all SQL
engines, etc. do and therefore it is what users will expect. (b) There is
little practical use in knowing the sign of a floating point zero value; this
sign kernel will be more consistent and more useful in more ways if it always
returns sign zero for value zero.
> [C++][Compute] Add sign function kernels
> ----------------------------------------
>
> Key: ARROW-12861
> URL: https://issues.apache.org/jira/browse/ARROW-12861
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Eduardo Ponce
> Assignee: Eduardo Ponce
> Priority: Major
> Labels: pull-request-available
> Fix For: 5.0.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Add the sign function to the compute kernels.
> sign(X) =
> * 1 if X > 0
> * 0 if X = 0
> * -1 if X < 0
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