Describe the bug

For someone who is new to DataFusion and is trying to write a custom UDAF, it may be a little confusing to understand why create_udaf only takes one DataType for the input_type. Additionally, I did not find any examples demonstrating how to create a UDAF with multiple input arguments.

https://github.com/apache/arrow-datafusion/blob/52cf58b46133d448e067455baab0faf8a50e565a/datafusion/expr/src/expr_fn.rs#L802-L809

To Reproduce

No response

Expected behavior

change input_type: DataType to input_type: Vec<DataType>

pub fn create_udaf(
    name: &str,
    
    return_type: Arc<DataType>,
    volatility: Volatility,
    accumulator: AccumulatorFactoryFunction,
    state_type: Arc<Vec<DataType>>,
) -> AggregateUDF {

Additional context

No response