buf.append(cur.meta(i));
}
throw new AbortException("No external ID column found in source " + (c + 1) + " to join with. Got: " + buf.toString());
}
// Destination columns
List<ArrayList<Object>> dcol = new ArrayList<ArrayList<Object>>(cur.metaLength());
for(int i = 0; i < cur.metaLength(); i++) {
// Skip the label columns
if(i == lblcol) {
dcol.add(null);
continue;