Type Alias datafusion_expr::function::WindowFunctionSimplification

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

crate::udwf::WindowUDFImpl::simplify simplifier closure A closure with two arguments:

• ‘window_function’: crate::expr::WindowFunction for which simplified has been invoked
• ‘info’: crate::simplify::SimplifyInfo

closure returns simplified Expr or an error.

Aliased Type

struct WindowFunctionSimplification(/* private fields */);