Method signature

datafusion/expr/src/higher_order_function.rs:931–933

Returns this function's [`HigherOrderSignature`].

(&self)

    /// Returns this function's [`HigherOrderSignature`].
    pub fn signature(&self) -> &HigherOrderSignature {
        self.inner.signature()
    }

    /// Returns the parameters of all lambdas of this function for the current step.
    ///