pitrou commented on code in PR #14106:
URL: https://github.com/apache/arrow/pull/14106#discussion_r977587161
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cpp/src/arrow/compute/kernels/scalar_cast_extension.cc:
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@@ -42,14 +42,17 @@ Status CastToExtension(KernelContext* ctx, const ExecSpan&
batch, ExecResult* ou
std::shared_ptr<CastFunction> GetCastToExtension(std::string name) {
auto func = std::make_shared<CastFunction>(std::move(name), Type::EXTENSION);
- for (auto types : {IntTypes(), FloatingPointTypes(), StringTypes(),
BinaryTypes()}) {
+ for (auto types : {PrimitiveTypes(), IntervalTypes(), TemporalTypes()}) {
for (auto in_ty : types) {
DCHECK_OK(
func->AddKernel(in_ty->id(), {in_ty}, kOutputTargetType,
CastToExtension));
}
}
- DCHECK_OK(func->AddKernel(Type::DICTIONARY, {InputType(Type::DICTIONARY)},
- kOutputTargetType, CastToExtension));
+ for (auto in_ty : {Type::DICTIONARY, Type::LIST, Type::LARGE_LIST,
+ Type::FIXED_SIZE_LIST, Type::EXTENSION}) {
Review Comment:
> The implementation would first cast from the input Extension to the target
Extension's storage type, so long as those are compatible, then to the final
Extension type.
Does it make sense? Let's say you have UUID which is backed by
`fixed_size_binary(16)` and Complex128 which is also backed by
`fixed_size_binary(16)`. You don't want to implicitly cast between each other.
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