presto-main/src/main/java/io/prestosql/operator/index/FieldSetFilteringRecordSet.java/FieldSetFilteringRecordCursor/getObject
class FieldSetFilteringRecordCursor:        @Override
        public Object getObject(int field)
        {
            // equals is super expensive for the currently supported types: Block
            throw new UnsupportedOperationException();
        }