Class Extension

datafusion/expr/src/logical_plan/plan.rs:3338–3341

#[allow(clippy::derived_hash_with_manual_eq)]
#[derive(Debug, Clone, Eq, Hash)]
pub struct Extension {
    /// The runtime extension operator
    pub node: Arc<dyn UserDefinedLogicalNode>,
}

// `PartialEq` cannot be derived for types containing `Arc<dyn Trait>`.
// This manual implementation should be removed if