Method is_nullable

datafusion/expr/src/udf.rs:251–254

(&self, args: &[Expr], schema: &dyn ExprSchema)

    #[deprecated(since = "50.0.0", note = "Use `return_field_from_args` instead.")]
    pub fn is_nullable(&self, args: &[Expr], schema: &dyn ExprSchema) -> bool {
        #[expect(deprecated)]
        self.inner.is_nullable(args, schema)
    }

    /// Return a preimage
    ///