Trait AggregateClassifier 

pub trait AggregateClassifier {
    // Required method
    fn is_registered_aggregate(&self, name: &str) -> bool;
}

Classification hook for engine-registered aggregate functions. Built-in aggregates are always recognised; the callback extends that set without making the planner depend on the engine.

Required Methods

fn is_registered_aggregate(&self, name: &str) -> bool

Dyn Compatibility

This trait is dyn compatible.

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

Implementors

impl<F> AggregateClassifier for F

where F: Fn(&str) -> bool,