@Override
    public boolean equals(java.lang.Object that) {
      if (that == null)
        return false;
      if (that instanceof Log_args log_args)
        return this.equals(log_args);
      return false;
    }
Returns true if field corresponding to fieldID is set (has been assigned a value) and false otherwise
zipkin-collector/scribe/src/main/java/zipkin2/collector/scribe/generated/Scribe.java