presto-kudu/src/main/java/io/prestosql/plugin/kudu/KuduRecordCursorWithVirtualRowId.java/KuduRecordCursorWithVirtualRowId/getSlice
class KuduRecordCursorWithVirtualRowId:    @Override
    public Slice getSlice(int field)
    {
        if (fieldMapping.get(field) == -1) {
            PartialRow partialRow = buildPrimaryKey();
            return Slices.wrappedBuffer(KeyEncoderAccessor.encodePrimaryKey(partialRow));
        }
        else {
            return super.getSlice(field);
        }
    }