Function create_window_expr 

pub fn create_window_expr(
    fun: &WindowFunctionDefinition,
    name: String,
    args: &[Arc<dyn PhysicalExpr>],
    partition_by: &[Arc<dyn PhysicalExpr>],
    order_by: &[PhysicalSortExpr],
    window_frame: Arc<WindowFrame>,
    input_schema: SchemaRef,
    ignore_nulls: bool,
    distinct: bool,
    filter: Option<Arc<dyn PhysicalExpr>>,
) -> Result<Arc<dyn WindowExpr>>

Create a physical expression for window function