Method downcast_ref

datafusion/catalog/src/table.rs:398–400

Attempts to downcast this table provider to a concrete type `T`, returning `None` if the provider is not of that type. Works correctly when called on `Arc ` via auto-deref, unlike `(&arc as &dyn Any).downcast_ref:: ()` which would attempt to downcast the `Arc` itself.

(&self)

    /// unlike `(&arc as &dyn Any).downcast_ref::<T>()` which would attempt to
    /// downcast the `Arc` itself.
    pub fn downcast_ref<T: TableProvider>(&self) -> Option<&T> {
        (self as &dyn Any).downcast_ref()
    }
}

/// Arguments for scanning a table with [`TableProvider::scan_with_args`].