DefaultDescriptor defaultDesc = columnDescriptor.getDefaultDescriptor(dd);
dm.clearDependencies(lcc, defaultDesc);
}
// need to deal with triggers if has referencedColumns
GenericDescriptorList tdl = dd.getTriggerDescriptors(td);
Enumeration descs = tdl.elements();
while (descs.hasMoreElements())
{
TriggerDescriptor trd = (TriggerDescriptor) descs.nextElement();
int[] referencedCols = trd.getReferencedCols();
if (referencedCols == null)