Function lambda

datafusion/expr/src/expr_fn.rs:724–729

Create a lambda expression

(params: impl IntoIterator<Item = impl Into<String>>, body: Expr)

/// Create a lambda expression
pub fn lambda(params: impl IntoIterator<Item = impl Into<String>>, body: Expr) -> Expr {
    Expr::Lambda(Lambda::new(
        params.into_iter().map(Into::into).collect(),
        body,
    ))
}

/// Create an unresolved lambda variable expression
///