@SuppressWarnings({"rawtypes"})
    @java.lang.Override
    protected com.google.protobuf.MapFieldReflectionAccessor internalGetMapFieldReflection(
        int number) {
      switch (number) {
        case 1:
          return internalGetAttributeMap();
        default:
          throw new RuntimeException("Invalid map field number: " + number);
      }
    }
<pre>
A set of attributes as key-value pairs.
</pre>

Protobuf type {@code google.devtools.cloudtrace.v2.Span.Attributes}
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/Span.java