Function sum

datafusion/expr/src/test/function_stub.rs:57–66

(expr: Expr)

create_func!(Sum, sum_udaf);

pub fn sum(expr: Expr) -> Expr {
    Expr::AggregateFunction(AggregateFunction::new_udf(
        sum_udaf(),
        vec![expr],
        false,
        None,
        vec![],
        None,
    ))
}

create_func!(Count, count_udaf);