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Require fixed width types for casting in cudf-polars #16381

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merged 4 commits into from
Jul 25, 2024
Merged

Require fixed width types for casting in cudf-polars #16381

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10d50e0
require fixed width types for gpu casting
brandon-b-miller Jul 24, 2024
d3dcb39
adjust logic
brandon-b-miller Jul 24, 2024
17944df
fix
brandon-b-miller Jul 24, 2024
6faf480
adjust contains test that was falling back early
brandon-b-miller Jul 25, 2024
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6 changes: 5 additions & 1 deletion python/cudf_polars/cudf_polars/dsl/expr.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1188,7 +1188,11 @@ class Cast(Expr):
def __init__(self, dtype: plc.DataType, value: Expr) -> None:
super().__init__(dtype)
self.children = (value,)
if not plc.unary.is_supported_cast(self.dtype, value.dtype):
if (
not plc.traits.is_fixed_width(self.dtype)
and plc.traits.is_fixed_width(value.dtype)
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and plc.unary.is_supported_cast(self.dtype, value.dtype)
):
raise NotImplementedError(
f"Can't cast {self.dtype.id().name} to {value.dtype.id().name}"
)
Expand Down
14 changes: 13 additions & 1 deletion python/cudf_polars/tests/expressions/test_numeric_binops.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,10 @@

import polars as pl

from cudf_polars.testing.asserts import assert_gpu_result_equal
from cudf_polars.testing.asserts import (
assert_gpu_result_equal,
assert_ir_translation_raises,
)

dtypes = [
pl.Int8,
Expand Down Expand Up @@ -111,3 +114,12 @@ def test_binop_with_scalar(left_scalar, right_scalar):
q = df.select(lop / rop)

assert_gpu_result_equal(q)


def test_numeric_to_string_cast_fails():
df = pl.DataFrame(
{"a": [1, 1, 2, 3, 3, 4, 1], "b": [None, 2, 3, 4, 5, 6, 7]}
).lazy()
q = df.select(pl.col("a").cast(pl.String))

assert_ir_translation_raises(q, NotImplementedError)
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