final DimensionSelector selector = selectorList.get(k);
final IndexedInts row = selector.getRow();
final int size = row.size();
// nothing to add to hasher if size == 0, only handle size == 1 and size != 0 cases.
if (size == 1) {
final String value = selector.lookupName(row.get(0));
hasher.putUnencodedChars(value != null ? value : NULL_STRING);
} else if (size != 0) {
final String[] values = new String[size];
for (int i = 0; i < size; ++i) {
final String value = selector.lookupName(row.get(i));