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Make is_supported_cast fail for variable-width inputs #23613

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Merged
rapids-bot merged 5 commits into from
Aug 14, 2026
+13 −4
Merged

Make is_supported_cast fail for variable-width inputs #23613

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48f80e3
Make is_supported_cast fail for variable-width inputs
JohnZed Aug 10, 2026
dfb999b
[pre-commit.ci] auto code formatting
pre-commit-ci[bot] Aug 10, 2026
e86fcff
Fix cast tests header comment
JohnZed Aug 10, 2026
7edb940
Expand to test multiple unsupported input types in IsSupportedCase test
JohnZed Aug 14, 2026
8914db2
Update cast header docs to reflect variable width inputs unsupported
JohnZed Aug 14, 2026
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2 changes: 1 addition & 1 deletion cpp/include/cudf/unary.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -117,7 +117,7 @@ std::unique_ptr<cudf::column> is_valid(
* @param mr Device memory resource used to allocate the returned column's device memory
*
* @returns Column of same size as `input` containing result of the cast operation
* @throw cudf::logic_error if `out_type` is not a fixed-width type
* @throw cudf::logic_error if `input` or `out_type` is not a fixed-width type
*/
std::unique_ptr<column> cast(
column_view const& input,
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4 changes: 2 additions & 2 deletions cpp/src/unary/cast_ops.cu
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@@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: Copyright (c) 2019-2026, NVIDIA CORPORATION.
* SPDX-FileCopyrightText: Copyright (c) 2019-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* SPDX-License-Identifier: Apache-2.0
*/

Expand Down Expand Up @@ -118,7 +118,7 @@ struct fixed_point_unary_cast {
template <typename From, typename To>
constexpr inline auto is_supported_non_fixed_point_cast()
{
return cudf::is_fixed_width<To>() &&
return cudf::is_fixed_width<From>() && cudf::is_fixed_width<To>() &&
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// Disallow fixed_point here (requires different specialization)
!(cudf::is_fixed_point<From>() || cudf::is_fixed_point<To>()) &&
// Disallow conversions between timestamps and numeric
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11 changes: 10 additions & 1 deletion cpp/tests/unary/cast_tests.cpp
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: Copyright (c) 2020-2026, NVIDIA CORPORATION.
* SPDX-FileCopyrightText: Copyright (c) 2020-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* SPDX-License-Identifier: Apache-2.0
*/

Expand Down Expand Up @@ -201,6 +201,15 @@ inline auto make_data_type()
return cudf::data_type{cudf::type_to_id<T>()};
}

TEST(IsSupportedCast, UnsupportedTypes)
{
auto const to_int32 = cudf::data_type{cudf::type_id::INT32};
EXPECT_FALSE(cudf::is_supported_cast(cudf::data_type{cudf::type_id::STRING}, to_int32));
EXPECT_FALSE(cudf::is_supported_cast(cudf::data_type{cudf::type_id::LIST}, to_int32));
EXPECT_FALSE(cudf::is_supported_cast(cudf::data_type{cudf::type_id::STRUCT}, to_int32));
EXPECT_FALSE(cudf::is_supported_cast(cudf::data_type{cudf::type_id::DICTIONARY32}, to_int32));
}

struct CastTimestampsSimple : public cudf::test::BaseFixture {};

TEST_F(CastTimestampsSimple, IsIdempotent)
Expand Down
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