tve.setColumnIndex(0);
tve.setColumnName(m_context.get(colGuid).getDisplayName());
tve.setColumnAlias(m_context.get(colGuid).getDisplayName());
tve.setTableName("");
PlanColumn colInfo = m_context.getPlanColumn(tve, "modified_tuples");
countNode.appendOutputColumn(colInfo);
// connect the nodes to build the graph
countNode.addAndLinkChild(dmlRoot);
sendNode.addAndLinkChild(countNode);