in flink-connector-cassandra/src/main/java/org/apache/flink/batch/connectors/cassandra/CassandraInputFormat.java [61:67]
public OUT nextRecord(OUT reuse) throws IOException {
final Row item = resultSet.one();
for (int i = 0; i < reuse.getArity(); i++) {
reuse.setField(item.getObject(i), i);
}
return reuse;
}