DBConstraint constraint2 = creation.getAffectedObject();
String[] colNames2 = constraint2.getColumnNames();
if (ArrayUtil.containsAll(colNames2, colNames1)) {
// columns were removed from the constraint
String[] removedColumns = diff(colNames1, colNames2);
changesToAdd.add(new ConstraintColumnsRemoval(constraint1, removedColumns));
creationsToRemove.add(creation);
subChangeIterator.remove();
} else if (ArrayUtil.containsAll(colNames1, colNames2)) {
// columns were added to the constraint
String[] addedColumns = diff(colNames2, colNames1);