Function roundtrip

python/pyarrow/tests/test_pandas.py:5292–5300

(df, schema=None)

    # Here we simply ensure we validate correctly.

    def roundtrip(df, schema=None):
        tab = pa.Table.from_pandas(df, schema=schema)
        tab.validate(full=True)
        # we expect to trigger chunking internally
        # an assertion failure here may just mean this threshold has changed
        num_chunks = tab.column(0).num_chunks
        assert num_chunks > 1
        tm.assert_frame_equal(tab.to_pandas(self_destruct=True,
                                            maps_as_pydicts="strict"), df)

    x = b"0" * 720000000
    roundtrip(pd.DataFrame({"strings": [x, x, x]}))