class RamAccountingPageIterator<TKey> implements PagingIterator<TKey, Row> {

    @VisibleForTesting
    final PagingIterator<TKey, Row> delegatePagingIterator;
    private final RowAccounting<Row> rowAccounting;

    public RamAccountingPageIterator(PagingIterator<TKey, Row> delegatePagingIterator, RowAccounting<Row> rowAccounting) {
        this.delegatePagingIterator = delegatePagingIterator;
        this.rowAccounting = rowAccounting;
    }

    @Override
    public void merge(Iterable<? extends KeyIterable<TKey, Row>> keyIterables) {<FILL_FUNCTION_BODY>}

    @Override
    public void finish() {
        delegatePagingIterator.finish();
    }

    @Override
    public TKey exhaustedIterable() {
        return delegatePagingIterator.exhaustedIterable();
    }

    @Override
    public Iterable<Row> repeat() {
        return delegatePagingIterator.repeat();
    }

    @Override
    public boolean hasNext() {
        return delegatePagingIterator.hasNext();
    }

    @Override
    public Row next() {
        return delegatePagingIterator.next();
    }
}

        for (KeyIterable<TKey, Row> iterable : keyIterables) {
            for (Row row : iterable) {
                rowAccounting.accountForAndMaybeBreak(row);
            }
        }
        delegatePagingIterator.merge(keyIterables);
    
<no_super_class>