presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/systemtables/ShardMetadataSystemTable.java/ShardMetadataSystemTable/cursor
class ShardMetadataSystemTable:    @Override
    public RecordCursor cursor(ConnectorTransactionHandle transactionHandle, ConnectorSession session, TupleDomain<Integer> constraint)
    {
        return new ShardMetadataRecordCursor(dbi, constraint);
    }