Class Projection

datafusion/expr/src/logical_plan/plan.rs:2300–2307

// mark non_exhaustive to encourage use of try_new/new()
#[non_exhaustive]
pub struct Projection {
    /// The list of expressions
    pub expr: Vec<Expr>,
    /// The incoming logical plan
    pub input: Arc<LogicalPlan>,
    /// The schema description of the output
    pub schema: DFSchemaRef,
}

// Manual implementation needed because of `schema` field. Comparison excludes this field.
impl PartialOrd for Projection {