Function all_unique

datafusion/physical-expr/src/expressions/lambda.rs:209–219

(params: &[String])

}

fn all_unique(params: &[String]) -> bool {
    match params.len() {
        0 | 1 => true,
        2 => params[0] != params[1],
        _ => {
            let mut set = HashSet::with_capacity(params.len());

            params.iter().all(|p| set.insert(p.as_str()))
        }
    }
}

fn check_async_udf(body: &Arc<dyn PhysicalExpr>) -> Result<()> {
    if body.exists(|expr| {