Function datafusion::logical_plan::create_udaf

pub fn create_udaf(
    name: &str, 
    input_type: DataType, 
    return_type: Arc<DataType>, 
    accumulator: AccumulatorFunctionImplementation, 
    state_type: Arc<Vec<DataType>>
) -> AggregateUDF

Creates a new UDAF with a specific signature, state type and return type. The signature and state type must match the Acumulator's implementation.