presto-tpch/src/main/java/io/prestosql/plugin/tpch/TpchRecordSet.java/TpchRecordSet/getSlice
class TpchRecordSet:        private Slice getSlice(TpchColumn<E> tpchColumn)
        {
            return Slices.utf8Slice(tpchColumn.getString(row));
        }