Type Alias AggregateFunctionSimplification 

pub type AggregateFunctionSimplification = Box<dyn Fn(AggregateFunction, &SimplifyContext) -> Result<Expr>>;

Type alias for crate::udaf::AggregateUDFImpl::simplify.

This closure is invoked with:

• aggregate_function: AggregateFunction with already simplified arguments
• info: SimplifyContext

It returns a simplified Expr or an error.

Aliased Type

pub struct AggregateFunctionSimplification(/* private fields */);