presto-hive/src/main/java/io/prestosql/plugin/hive/HiveCoercionRecordCursor.java/HiveCoercionRecordCursor/getSlice
class HiveCoercionRecordCursor:        public Slice getSlice(RecordCursor delegate, int field)
        {
            assureLoaded(delegate, field);
            return sliceValue;
        }