lidavidm commented on code in PR #41823:
URL: https://github.com/apache/arrow/pull/41823#discussion_r1665360549
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cpp/src/arrow/compute/kernels/scalar_cast_numeric.cc:
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@@ -875,6 +895,10 @@ std::vector<std::shared_ptr<CastFunction>>
GetNumericCasts() {
auto cast_null = std::make_shared<CastFunction>("cast_null", Type::NA);
DCHECK_OK(cast_null->AddKernel(Type::DICTIONARY,
{InputType(Type::DICTIONARY)}, null(),
OutputAllNull));
+ // Explicitly allow casting extension type with null backing array to null
Review Comment:
Ah, I forgot to stage the Python tests, but Arrow C++ does allow that cast
except in this case
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