Method extension

datafusion/datasource/src/mod.rs:295–297

Borrow the extension of type `T`, if one is attached.

(&self)

    /// Borrow the extension of type `T`, if one is attached.
    pub fn extension<T: Any + Send + Sync>(&self) -> Option<&T> {
        self.extensions.get::<T>()
    }

    /// Attach a type-erased extension to this file.
    ///