js8544 opened a new issue, #15292:
URL: https://github.com/apache/arrow/issues/15292
### Describe the bug, including details regarding any error messages,
version, and platform.
All array classes have the `using TypeClass = xxx` type alias except for
ExtensionArray.
With the alias, it will be easier to write templated inline visitors such as
the following code block:
```Cpp
class ExampleVisitor {
public:
template <typename T>
Status Visit(const T& arr) {
if constexpr (arrow::is_number_type<typename T::TypeClass>::value) {
///
} else {
///
}
return Status::OK();
}
};
```
Current it fails to compile with message: `No type named 'TypeClass' in
'arrow::ExtensionArray'`.
### Component(s)
C++
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