[jira] [Created] (SPARK-58718) Fix signbit for -0.0 and nullable dtypes

["Haotian Sun (Jira)" <ji...@apache.org>]

Haotian Sun created SPARK-58718:
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             Summary: 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: 5.0.0
            Reporter: Haotian Sun


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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