@Override
public void writeData(ObjectDataOutput out) throws IOException {
super.writeData(out);
dataKey.writeData(out);
IOUtil.writeNullableData(out, dataNewValue);
IOUtil.writeNullableData(out, dataOldValue);
}
@Override
public void writeData(ObjectDataOutput out) throws IOException {
super.writeData(out);
out.writeData(dataKey);
out.writeData(dataNewValue);
out.writeData(dataOldValue);
out.writeData(dataMergingValue);
}