[jira] [Created] (ARROW-10210) [Python] Pandas roundtrip of timestamp array ignores time unit

["Krisztian Szucs (Jira)" <ji...@apache.org>]

Krisztian Szucs created ARROW-10210:
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             Summary: [Python] Pandas roundtrip of timestamp array ignores time unit
                 Key: ARROW-10210
                 URL: https://issues.apache.org/jira/browse/ARROW-10210
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
            Reporter: Krisztian Szucs


When converting from an object type pandas series with np.datetime64[ns] we don't adjust the values based on the input numpy datetime unit to the target arrow time unit.

Reproducer test case:

{code:python}
@pytest.mark.parametrize('unit', ['s', 'ms', 'us', 'ns'])
def test_timestamp_array_pandas_roundtrip(unit):
    tz = pytz.timezone('EST')
    ty = pa.list_(pa.timestamp(unit, tz=tz))

    # test list roundtrip
    data = [[datetime(2000, 1, 1, 0, 0, tzinfo=tz)]]
    arr = pa.array(data, type=ty)
    assert arr.to_pylist() == data

    # test pandas roundtrip
    s = arr.to_pandas()
    restored = pa.array(s, type=arr.type, from_pandas=True)
    assert restored.equals(arr)
{code}



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