presto-kafka/src/main/java/io/prestosql/plugin/kafka/KafkaRecordSet.java/KafkaRecordSet/getType
class KafkaRecordSet:        @Override
        public Type getType(int field)
        {
            checkArgument(field < columnHandles.size(), "Invalid field index");
            return columnHandles.get(field).getType();
        }