Trait datafusion::execution::FunctionRegistry

pub trait FunctionRegistry {
    // Required methods
    fn udfs(&self) -> HashSet<String, RandomState>;
    fn udf(&self, name: &str) -> Result<Arc<ScalarUDF, Global>, DataFusionError>;
    fn udaf(
        &self,
        name: &str
    ) -> Result<Arc<AggregateUDF, Global>, DataFusionError>;
    fn udwf(
        &self,
        name: &str
    ) -> Result<Arc<WindowUDF, Global>, DataFusionError>;
}

A registry knows how to build logical expressions out of user-defined function’ names

Required Methods

fn udfs(&self) -> HashSet<String, RandomState>

Set of all available udfs.

fn udf(&self, name: &str) -> Result<Arc<ScalarUDF, Global>, DataFusionError>

Returns a reference to the udf named name.

fn udaf(&self, name: &str) -> Result<Arc<AggregateUDF, Global>, DataFusionError>

Returns a reference to the udaf named name.

fn udwf(&self, name: &str) -> Result<Arc<WindowUDF, Global>, DataFusionError>

Returns a reference to the udwf named name.

Implementors

impl FunctionRegistry for SessionContext

impl FunctionRegistry for SessionState

impl FunctionRegistry for TaskContext