Method register_udaf

datafusion/expr/src/registry.rs:254–259

(
        &mut self,
        udaf: Arc<AggregateUDF>,
    )

            .insert(function.name().into(), function))
    }
    fn register_udaf(
        &mut self,
        udaf: Arc<AggregateUDF>,
    ) -> Result<Option<Arc<AggregateUDF>>> {
        Ok(self.udafs.insert(udaf.name().into(), udaf))
    }
    fn register_udwf(&mut self, udaf: Arc<WindowUDF>) -> Result<Option<Arc<WindowUDF>>> {
        Ok(self.udwfs.insert(udaf.name().into(), udaf))
    }