@Override
  public java.lang.String toString() {
    java.lang.StringBuilder sb = new java.lang.StringBuilder("IntString(");
    boolean first = true;

    sb.append("myint:");
    sb.append(this.myint);
    first = false;
    if (!first) sb.append(", ");
    sb.append("myString:");
    if (this.myString == null) {
      sb.append("null");
    } else {
      sb.append(this.myString);
    }
    first = false;
    if (!first) sb.append(", ");
    sb.append("underscore_int:");
    sb.append(this.underscore_int);
    first = false;
    sb.append(")");
    return sb.toString();
  }
Returns true if field corresponding to fieldID is set (has been assigned a value) and false otherwise
serde/src/gen/thrift/gen-javabean/org/apache/hadoop/hive/serde2/thrift/test/IntString.java