Function collect_arg_values

nodedb-query/src/window/value_eval.rs:377–396

(
    rows: &[Vec<Value>],
    indices: &[usize],
    column_index: &HashMap<String, usize>,
    spec: &WindowFuncSpec,
)

// ── Offset functions ──────────────────────────────────────────────────────────

fn collect_arg_values(
    rows: &[Vec<Value>],
    indices: &[usize],
    column_index: &HashMap<String, usize>,
    spec: &WindowFuncSpec,
) -> Vec<Value> {
    indices
        .iter()
        .map(|&i| {
            rows.get(i)
                .map(|row| {
                    spec.args
                        .first()
                        .map(|expr| eval_arg_for_row(expr, row, column_index))
                        .unwrap_or(Value::Null)
                })
                .unwrap_or(Value::Null)
        })
        .collect()
}

fn apply_v_lag(
    rows: &mut [Vec<Value>],