Function datafusion_expr::expr_fn::create_udf

pub fn create_udf(
    name: &str,
    input_types: Vec<DataType>,
    return_type: Arc<DataType>,
    volatility: Volatility,
    fun: ScalarFunctionImplementation,
) -> ScalarUDF

Convenience method to create a new user defined scalar function (UDF) with a specific signature and specific return type.

Note this function does not expose all available features of ScalarUDF, such as

• computing return types based on input types
• multiple Signatures
• aliases

See ScalarUDF for details and examples on how to use the full functionality.