10BC0 feat: support astype to the string "json" by chelsea-lin · Pull Request #2073 · googleapis/python-bigquery-dataframes · GitHub
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feat: support astype to the string "json" #2073

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Merged
chelsea-lin merged 1 commit into from
Sep 11, 2025
Merged

feat: support astype to the string "json" #2073

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9 changes: 6 additions & 3 deletions bigframes/dtypes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -641,6 +641,9 @@ def _dtype_from_string(dtype_string: str) -> typing.Optional[Dtype]:
return BIGFRAMES_STRING_TO_BIGFRAMES[
typing.cast(DtypeString, str(dtype_string))
]
if isinstance(dtype_string, str) and dtype_string.lower() == "json":
return JSON_DTYPE

raise TypeError(
textwrap.dedent(
f"""
Expand All @@ -652,9 +655,9 @@ def _dtype_from_string(dtype_string: str) -> typing.Optional[Dtype]:
The following pandas.ExtensionDtype are supported:
pandas.BooleanDtype(), pandas.Float64Dtype(),
pandas.Int64Dtype(), pandas.StringDtype(storage="pyarrow"),
pd.ArrowDtype(pa.date32()), pd.ArrowDtype(pa.time64("us")),
pd.ArrowDtype(pa.timestamp("us")),
pd.ArrowDtype(pa.timestamp("us", tz="UTC")).
pandas.ArrowDtype(pa.date32()), pandas.ArrowDtype(pa.time64("us")),
pandas.ArrowDtype(pa.timestamp("us")),
pandas.ArrowDtype(pa.timestamp("us", tz="UTC")).
{constants.FEEDBACK_LINK}
"""
)
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12 changes: 12 additions & 0 deletions tests/system/small/test_series.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3903,6 +3903,18 @@ def test_float_astype_json(errors):
pd.testing.assert_series_equal(bf_result.to_pandas(), expected_result)


def test_float_astype_json_str():
data = ["1.25", "2500000000", None, "-12323.24"]
bf_series = series.Series(data, dtype=dtypes.FLOAT_DTYPE)

bf_result = bf_series.astype("json")
assert bf_result.dtype == dtypes.JSON_DTYPE

expected_result = pd.Series(data, dtype=dtypes.JSON_DTYPE)
expected_result.index = expected_result.index.astype("Int64")
pd.testing.assert_series_equal(bf_result.to_pandas(), expected_result)


@pytest.mark.parametrize("errors", ["raise", "null"])
def test_string_astype_json(errors):
data = [
Expand D 3A69 own
0