in src/main/java/org/apache/cassandra/distributed/api/Row.java [45:55]
public Row(String[] names)
{
Objects.requireNonNull(names, "names");
this.names = names;
this.nameIndex = new HashMap<>(names.length);
for (int i = 0; i < names.length; i++)
{
// if duplicate names, always index by the first one seen
nameIndex.putIfAbsent(names[i], i);
}
}