public void validate() throws org.apache.thrift.TException {
    // check for required fields
    if (row == null) {
      throw new org.apache.thrift.protocol.TProtocolException("Required field 'row' was not present! Struct: " + toString());
    }
    if (columns == null) {
      throw new org.apache.thrift.protocol.TProtocolException("Required field 'columns' was not present! Struct: " + toString());
    }
    // check for sub-struct validity
    if (cellVisibility != null) {
      cellVisibility.validate();
    }
  }
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/TIncrement.java