Function datafusion_expr::expr_fn::call_fn

pub fn call_fn(name: impl AsRef<str>, args: Vec<Expr>) -> Result<Expr>

Calls a named built in function

use datafusion_expr::{col, lit, call_fn};

// create the expression sin(x) < 0.2
let expr = call_fn("sin", vec![col("x")]).unwrap().lt(lit(0.2));