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

    if (isSetExpression()) {
      sb.append("expression:");
      if (this.expression == null) {
        sb.append("null");
      } else {
        sb.append(this.expression);
      }
      first = false;
    }
    sb.append(")");
    return sb.toString();
  }
Returns true if field corresponding to fieldID is set (has been assigned a value) and false otherwise
hbase-thrift/src/main/java/org/apache/hadoop/hbase/thrift2/generated/TCellVisibility.java