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UDFCoercionExt

datafusion_expr::type_coercion::functions

Trait UDFCoercionExt 

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

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

Required Methods§

Source

fn name(&self) -> &str

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

Source

fn signature(&self) -> &Signature

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

Source

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

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

Dyn Compatibility§

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors§