final String collectionName = collectionPartitions[partition % collectionPartitions.length];
final XMLParser parser = new XMLParser(false, nodeIdProvider, nodeId, frame, appender, childSeq,
dCtx.getStaticContext());
return new AbstractUnaryInputUnaryOutputOperatorNodePushable() {
@Override
public void open() throws HyracksDataException {
appender.reset(frame, true);
writer.open();
}