Type Alias datafusion_expr::function::AggregateFunctionSimplification

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

crate::udaf::AggregateUDFImpl::simplify simplifier closure A closure with two arguments:

• ‘aggregate_function’: crate::expr::AggregateFunction for which simplified has been invoked
• ‘info’: crate::simplify::SimplifyInfo

closure returns simplified Expr or an error.

Aliased Type

struct AggregateFunctionSimplification(/* private fields */);