Trait UDFCoercionExt 

pub trait UDFCoercionExt {
    // Required methods
    fn name(&self) -> &str;
    fn signature(&self) -> &Signature;
    fn coerce_types(&self, arg_types: &[DataType]) -> Result<Vec<DataType>>;
}

Extension trait to unify common functionality between ScalarUDF, AggregateUDF and WindowUDF for use by signature coercion functions.

Required Methods

fn name(&self) -> &str

Should delegate to ScalarUDF::name, AggregateUDF::name or WindowUDF::name.

fn signature(&self) -> &Signature

Should delegate to ScalarUDF::signature, AggregateUDF::signature or WindowUDF::signature.

fn coerce_types(&self, arg_types: &[DataType]) -> Result<Vec<DataType>>

Should delegate to ScalarUDF::coerce_types, AggregateUDF::coerce_types or WindowUDF::coerce_types.

Implementors

impl UDFCoercionExt for AggregateUDF

impl UDFCoercionExt for ScalarUDF

impl UDFCoercionExt for WindowUDF