BUG: [pyarrow] Division of Timedelta("-1 days +23:59:59") by Timedelta("1s") results in NaN

[randolf-scholz]

Pandas version checks

• I have checked that this issue has not already been reported.

• I have confirmed this bug exists on the latest version of pandas.

• I have confirmed this bug exists on the main branch of pandas.

Reproducible Example

from pandas import Series, Timedelta

unit = Timedelta("1s")
time = Series([Timedelta("0 days 00:00:00"), Timedelta("-1 days +23:59:59")])
time_arrow = time.astype("duration[us][pyarrow]")

print(time / unit)  # [0, -1]
print(time_arrow / unit)  # [0, NaN]

Issue Description

When using pyarrow duration dtype, we get incorrect result when performing division.

Expected Behavior

The results should be identical floats, independent of the backend.

Installed Versions

INSTALLED VERSIONS

commit : a671b5a
python : 3.11.6.final.0
python-bits : 64
OS : Linux
OS-release : 6.2.0-37-generic
Version : #38~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Nov 2 18:01:13 UTC 2
machine : x86_64
processor : x86_64
byteorder : little
LC_ALL : None
LANG : en_US.UTF-8
LOCALE : en_US.UTF-8

pandas : 2.1.4
numpy : 1.26.2
pytz : 2023.3.post1
dateutil : 2.8.2
setuptools : 69.0.2
pip : 23.3.1
Cython : None
pytest : 7.4.3
hypothesis : None
sphinx : 7.2.6
blosc : None
feather : None
xlsxwriter : None
lxml.etree : None
html5lib : None
pymysql : None
psycopg2 : None
jinja2 : 3.1.2
IPython : 8.18.1
pandas_datareader : None
bs4 : 4.12.2
bottleneck : None
dataframe-api-compat: None
fastparquet : None
fsspec : 2023.12.1
gcsfs : None
matplotlib : 3.8.2
numba : None
numexpr : None
odfpy : None
openpyxl : 3.1.2
pandas_gbq : None
pyarrow : 14.0.1
pyreadstat : None
pyxlsb : None
s3fs : None
scipy : 1.11.4
sqlalchemy : None
tables : None
tabulate : 0.9.0
xarray : None
xlrd : None
zstandard : None
tzdata : 2023.3
qtpy : None
pyqt5 : None

[mroeschke]

Thanks for the report. This looks like the direct result of the pyarrow compute function

(Pdb) self._pa_array
<pyarrow.lib.ChunkedArray object at 0x13da9b6f0>
[
  [
    0,
    -1000000
  ]
]
(Pdb) other
<pyarrow.DurationScalar: Timedelta('0 days 00:00:01')>
(Pdb) pc.divide(self._pa_array, other)
<pyarrow.lib.ChunkedArray object at 0x13db037e0>
[
  [
    0,
    nan
  ]

I suspect pyarrow might be casting other to 0 resulting in a divide by 0. Could you open an issue upstream?

[rohanjain101]

Possibly related to apache/arrow#38566

[randolf-scholz]

Opened apache/arrow#39156, seems that division with any negative duration leads to NAN

[randolf-scholz]

Fixed with pyarrow 15.0