presto-accumulo/src/main/java/io/prestosql/plugin/accumulo/io/AccumuloRecordCursor.java/AccumuloRecordCursor/retrieveOnlyRowIds
class AccumuloRecordCursor:    private boolean retrieveOnlyRowIds(String rowIdName)
    {
        return columnHandles.isEmpty() || (columnHandles.size() == 1 && columnHandles.get(0).getName().equals(rowIdName));
    }