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fix: .dt.time() was panicking for datetimes prior to unix epoch #13812

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merged 3 commits into from
Jan 20, 2024
Merged

fix: .dt.time() was panicking for datetimes prior to unix epoch #13812

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c569b87
fix: .dt.time() was panicking for datetimes prior to unix epoch
MarcoGorelli Jan 18, 2024
245a87f
SimpleImpl
mcrumiller Jan 19, 2024
f7419ad
Merge pull request #8 from mcrumiller/man-on-the-mooner
MarcoGorelli Jan 19, 2024
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26 changes: 10 additions & 16 deletions crates/polars-core/src/chunked_array/logical/datetime.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -80,23 +80,17 @@ impl LogicalType for DatetimeChunked {
.into_series()),
},
#[cfg(feature = "dtype-time")]
(Datetime(tu, _), Time) => match tu {
TimeUnit::Nanoseconds => Ok((self.0.as_ref() % NS_IN_DAY)
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the issue with the current implementation is that self.0.as_ref() % NS_IN_DAY might return a negative value

.cast(&Int64)
.unwrap()
(Datetime(tu, _), Time) => Ok({
let (modder, multiplier) = match tu {
TimeUnit::Nanoseconds => (NS_IN_DAY, 1i64),
TimeUnit::Microseconds => (US_IN_DAY, 1_000i64),
TimeUnit::Milliseconds => (MS_IN_DAY, 1_000_000i64),
};
self.0
.apply_values(|v| (v % modder * multiplier) + (NS_IN_DAY * (v < 0) as i64))
.into_time()
.into_series()),
TimeUnit::Microseconds => Ok((self.0.as_ref() % US_IN_DAY * 1_000i64)
.cast(&Int64)
.unwrap()
.into_time()
.into_series()),
TimeUnit::Milliseconds => Ok((self.0.as_ref() % MS_IN_DAY * 1_000_000i64)
.cast(&Int64)
.unwrap()
.into_time()
.into_series()),
},
.into_series()
}),
_ => self.0.cast(dtype),
}
}
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14 changes: 12 additions & 2 deletions py-polars/tests/unit/namespaces/test_datetime.py
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Expand Up @@ -144,8 +144,18 @@ def test_local_datetime_sortedness(time_zone: str | None, expected: bool) -> Non
def test_local_time_sortedness(time_zone: str | None) -> None:
ser = (pl.Series([datetime(2022, 1, 1, 23)]).dt.replace_time_zone(time_zone)).sort()
result = ser.dt.time()
assert result.flags["SORTED_ASC"] is False
assert result.flags["SORTED_DESC"] is False
assert result.flags["SORTED_ASC"]
assert not result.flags["SORTED_DESC"]
Comment on lines -147 to +148
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this one should've been sorted to begin with, but that's already being dealt with in #13808



@pytest.mark.parametrize("time_unit", ["ms", "us", "ns"])
def test_local_time_before_epoch(time_unit: TimeUnit) -> None:
ser = pl.Series([datetime(1969, 7, 21, 2, 56, 2, 123000)]).dt.cast_time_unit(
time_unit
)
result = ser.dt.time().item()
expected = time(2, 56, 2, 123000)
assert result == expected


@pytest.mark.parametrize(
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