Cerdore commented on issue #39024:
URL: https://github.com/apache/arrow/issues/39024#issuecomment-1835542795
> Just curious, where would `ExtendMatcher` been used?
Sorry, I have added some code to supplement the information.
Regitster Function will use _Matcher_ to construct _InputType_.
```
using SmallIntMatcher = ExtendMatcher<SmallintTypecxs>;
std::shared_ptr<TypeMatcher> SmallIntcxs(Type::type );
InputType in_type(SmallIntcxs(ty.get()->storage_id()));
ARROW_RETURN_NOT_OK(func->AddKernel({in_type,in_type}, int16(),
derived_ptr->exec));
```
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