Trait datafusion::execution::registry::FunctionRegistry

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

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

Required Methods

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

Set of all available udfs.

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

Returns a reference to the udf named name.

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

Returns a reference to the udaf named name.

Implementors

impl FunctionRegistry for SessionContext

impl FunctionRegistry for SessionState

impl FunctionRegistry for TaskContext