bkietz commented on a change in pull request #9294:
URL: https://github.com/apache/arrow/pull/9294#discussion_r572201225
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File path: cpp/src/arrow/compute/kernels/scalar_cast_boolean.cc
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@@ -50,6 +50,7 @@ struct ParseBooleanString {
std::vector<std::shared_ptr<CastFunction>> GetBooleanCasts() {
auto func = std::make_shared<CastFunction>("cast_boolean", Type::BOOL);
AddCommonCasts(Type::BOOL, boolean(), func.get());
+ AddZeroCopyCast(Type::BOOL, boolean(), boolean(), func.get());
Review comment:
It does require a distinct kernel since the cast kernels are structured
so that each implements a single `from_id -> to_id` cast. Perhaps when
refactoring cast we can try to make this more efficient
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