kou commented on code in PR #39362:
URL: https://github.com/apache/arrow/pull/39362#discussion_r1442490790
##########
cpp/src/arrow/compute/kernels/scalar_cast_dictionary.cc:
##########
@@ -77,17 +85,23 @@ Status CastToDictionary(KernelContext* ctx, const ExecSpan&
batch, ExecResult* o
return Status::OK();
}
-std::vector<std::shared_ptr<CastFunction>> GetDictionaryCasts() {
- auto func = std::make_shared<CastFunction>("cast_dictionary",
Type::DICTIONARY);
-
- AddCommonCasts(Type::DICTIONARY, kOutputTargetType, func.get());
- ScalarKernel kernel({InputType(Type::DICTIONARY)}, kOutputTargetType,
CastToDictionary);
+template <typename SrcType>
+void AddDictionaryCast(CastFunction* func) {
+ ScalarKernel kernel;
+ kernel.exec = CastToDictionary;
+ kernel.signature =
+ KernelSignature::Make({InputType(SrcType::type_id)}, kOutputTargetType);
kernel.null_handling = NullHandling::COMPUTED_NO_PREALLOCATE;
- kernel.mem_allocation = MemAllocation::NO_PREALLOCATE;
+ DCHECK_OK(func->AddKernel(SrcType::type_id, std::move(kernel)));
+}
- DCHECK_OK(func->AddKernel(Type::DICTIONARY, std::move(kernel)));
+std::vector<std::shared_ptr<CastFunction>> GetDictionaryCasts() {
+ auto cast_dict = std::make_shared<CastFunction>("cast_dictionary",
Type::DICTIONARY);
+ AddCommonCasts(Type::DICTIONARY, kOutputTargetType, cast_dict.get());
+ AddDictionaryCast<DictionaryType>(cast_dict.get());
+ AddDictionaryCast<StringType>(cast_dict.get());
Review Comment:
It makes sense.
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