get_limit_effect

datafusion_physical_optimizer::limit_pushdown_past_window

Function get_limit_effect 

Source 
fn get_limit_effect(expr: &Arc<dyn WindowExpr>) -> LimitEffect
Expand description

Examines the WindowExpr and decides:

  1. The expression does not change the window size
  2. The expression grows it by X amount
  3. We don’t know

§Arguments

  • expr the expression to examine

§Returns

The effect on the limit