Function create_udf

datafusion/expr/src/expr_fn.rs:408–422

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 [`Signature`]s aliases See [`ScalarUDF`] for details and examples on how to use the full functionality.

(
    name: &str,
    input_types: Vec<DataType>,
    return_type: DataType,
    volatility: Volatility,
    fun: ScalarFunctionImplementation,
)

/// See [`ScalarUDF`] for details and examples on how to use the full
/// functionality.
pub fn create_udf(
    name: &str,
    input_types: Vec<DataType>,
    return_type: DataType,
    volatility: Volatility,
    fun: ScalarFunctionImplementation,
) -> ScalarUDF {
    ScalarUDF::from(SimpleScalarUDF::new(
        name,
        input_types,
        return_type,
        volatility,
        fun,
    ))
}

/// Implements [`ScalarUDFImpl`] for functions that have a single signature and
/// return type.