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https://issues.apache.org/jira/browse/SPARK-58718?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ruifeng Zheng resolved SPARK-58718.
-----------------------------------
Fix Version/s: 4.4.0
Resolution: Fixed
Issue resolved by pull request 57937
[https://github.com/apache/spark/pull/57937]
> Fix signbit for -0.0 and nullable dtypes
> ----------------------------------------
>
> Key: SPARK-58718
> URL: https://issues.apache.org/jira/browse/SPARK-58718
> Project: Spark
> Issue Type: Sub-task
> Components: Pandas API on Spark
> Affects Versions: 4.4.0
> Reporter: Haotian Sun
> Assignee: Haotian Sun
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.4.0
>
>
> np.signbit in the pandas API on Spark maps to F.when(c < 0,
> True).otherwise(False), which returns the wrong result for -0.0:
> np.signbit(-0.0) is True because the IEEE-754 sign bit is set, but -0.0 < 0
> is False, so the current mapping returns False. It also does not propagate a
> genuine missing value (<NA>) from a nullable dtype such as Int64.
> This subtask makes the mapping match NumPy for signed zero and for
> nullable-dtype nulls, following the same approach recently used for copysign
> (SPARK-58630). Found while working on the SPARK-58532 umbrella.
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