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BUG: read_json silently ignores the dtype when engine=pyarrow #59516

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benjamin-hodgson opened this issue Aug 14, 2024 · 5 comments · May be fixed by #60997
Open
3 tasks done

BUG: read_json silently ignores the dtype when engine=pyarrow #59516

benjamin-hodgson opened this issue Aug 14, 2024 · 5 comments · May be fixed by #60997
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@jahn96 @will-larkin
Labels
Bug Dtype Conversions Unexpected or buggy dtype conversions IO JSON read_json, to_json, json_normalize

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@benjamin-hodgson
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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

import pandas as pd
import json

with open("test.json", "w") as f:
    json.dump({"Col1": 123}, f)

dtype = {"Col1": "int32[pyarrow]"}

df = pd.read_json("test.json", dtype=dtype, lines=True, engine="pyarrow", dtype_backend="pyarrow")

print(df.dtypes.to_dict())  # prints {'Col1': int64[pyarrow]}

Issue Description

The call to pyarrow_json.read_json doesn't pass any ParseOptions. This means that determining the dtype is always left up to the pyarrow json parser's dtype inference system, even when we explicitly passed a requested dtype into pd.read_json.

Expected Behavior

read_json's pyarrow parser should respect the requested dtype.

Installed Versions

INSTALLED VERSIONS

commit : d9cdd2e
python : 3.12.3.final.0
python-bits : 64
OS : Windows
OS-release : 11
Version : 10.0.22631
machine : AMD64
processor : Intel64 Family 6 Model 165 Stepping 5, GenuineIntel
byteorder : little
LC_ALL : None
LANG : None
LOCALE : English_United Kingdom.1252

pandas : 2.2.2
numpy : 2.0.1
pytz : 2024.1
dateutil : 2.9.0.post0
setuptools : 72.1.0
pip : None
Cython : None
pytest : 8.3.2
hypothesis : None
sphinx : 7.4.7
blosc : None
feather : None
xlsxwriter : None
lxml.etree : None
html5lib : None
pymysql : None
psycopg2 : None
jinja2 : 3.1.4
IPython : 8.26.0
pandas_datareader : None
adbc-driver-postgresql: None
adbc-driver-sqlite : None
bs4 : 4.12.3
bottleneck : None
dataframe-api-compat : None
fastparquet : None
fsspec : 2024.6.1
gcsfs : None
matplotlib : 3.9.1
numba : None
numexpr : None
odfpy : None
openpyxl : None
pandas_gbq : None
pyarrow : 17.0.0
pyreadstat : None
python-calamine : None
pyxlsb : None
s3fs : None
scipy : 1.14.0
sqlalchemy : None
tables : None
tabulate : 0.9.0
xarray : None
xlrd : None
zstandard : None
tzdata : 2024.1
qtpy : None
pyqt5 : None
@benjamin-hodgson benjamin-hodgson added Bug Needs Triage Issue that has not been reviewed by a pandas team member labels Aug 14, 2024
@rhshadrach rhshadrach added IO JSON read_json, to_json, json_normalize and removed Needs Triage Issue that has not been reviewed by a pandas team member labels Aug 14, 2024
@rhshadrach
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Thanks for the report, further investigations and PRs to fix are welcome!

@rhshadrach rhshadrach added the Dtype Conversions Unexpected or buggy dtype conversions label Aug 14, 2024
@jahn96
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jahn96 commented Aug 20, 2024

take

@KevsterAmp
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@jahn96 are you still working on this?

@jahn96 jahn96 mentioned this issue Sep 16, 2024
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@jahn96
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jahn96 commented Sep 16, 2024

@jahn96 are you still working on this?

Yes! Just got back from the break and raised a PR

@will-larkin
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take

@will-larkin will-larkin linked a pull request Feb 24, 2025 that will close this issue
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@jahn96 jahn96

@will-larkin will-larkin

Labels
Bug Dtype Conversions Unexpected or buggy dtype conversions IO JSON read_json, to_json, json_normalize
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@benjamin-hodgson @jahn96 @rhshadrach @will-larkin @KevsterAmp