Function polars_plan::logical_plan::set_estimated_row_counts

pub fn set_estimated_row_counts(
    root: Node,
    lp_arena: &mut Arena<ALogicalPlan>,
    expr_arena: &Arena<AExpr>,
    _filter_count: usize,
    scratch: &mut Vec<Node>
) -> (Option<usize>, usize, usize)