Method get_aggregate_meta

datafusion/sql/src/expr/mod.rs:1422–1427

(&self, name: &str)

        }

        fn get_aggregate_meta(&self, name: &str) -> Option<Arc<AggregateUDF>> {
            match name {
                "sum" => Some(datafusion_functions_aggregate::sum::sum_udaf()),
                _ => None,
            }
        }

        fn get_variable_type(&self, _variable_names: &[String]) -> Option<DataType> {
            None