Method find_window_func

datafusion/sql/src/expr/function.rs:975–996

(
        &self,
        name: &str,
    )

    }

    pub(super) fn find_window_func(
        &self,
        name: &str,
    ) -> Result<WindowFunctionDefinition> {
        // Check udaf first
        let udaf = self.context_provider.get_aggregate_meta(name);
        // Use the builtin window function instead of the user-defined aggregate function
        if udaf.as_ref().is_some_and(|udaf| {
            udaf.name() != "first_value"
                && udaf.name() != "last_value"
                && udaf.name() != "nth_value"
        }) {
            Ok(WindowFunctionDefinition::AggregateUDF(udaf.unwrap()))
        } else {
            self.context_provider
                .get_window_meta(name)
                .map(WindowFunctionDefinition::WindowUDF)
                .ok_or_else(|| {
                    plan_datafusion_err!("There is no window function named {name}")
                })
        }
    }

    fn sql_fn_arg_to_logical_expr(
        &self,