pub trait ExtensionArrayTrait: ArrayTrait {
    // Required method
    fn storage_array(&self) -> ArrayData;
    // Provided method
    fn ext_dtype(&self) -> &Arc<ExtDType> { ... }
}pub trait ExtensionArrayTrait: ArrayTrait {
    // Required method
    fn storage_array(&self) -> ArrayData;
    // Provided method
    fn ext_dtype(&self) -> &Arc<ExtDType> { ... }
}