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

    sb.append("table:");
    if (this.table == null) {
      sb.append("null");
    } else {
      org.apache.thrift.TBaseHelper.toString(this.table, sb);
    }
    first = false;
    if (!first) sb.append(", ");
    sb.append("row:");
    if (this.row == null) {
      sb.append("null");
    } else {
      org.apache.thrift.TBaseHelper.toString(this.row, sb);
    }
    first = false;
    if (!first) sb.append(", ");
    sb.append("columns:");
    if (this.columns == null) {
      sb.append("null");
    } else {
      org.apache.thrift.TBaseHelper.toString(this.columns, sb);
    }
    first = false;
    if (!first) sb.append(", ");
    sb.append("values:");
    if (this.values == null) {
      sb.append("null");
    } else {
      org.apache.thrift.TBaseHelper.toString(this.values, sb);
    }
    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/thrift/generated/TAppend.java