@Override
public void hashRow(DimensionSelector dimSelector, Hasher hasher) {
final IndexedInts row = dimSelector.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 = dimSelector.lookupName(row.get(0));
hasher.putUnencodedChars(nullToSpecial(value));
} else if (size != 0) {
final String[] values = new String[size];
for (int i = 0; i < size; ++i) {
final String value = dimSelector.lookupName(row.get(i));
values[i] = nullToSpecial(value);
}
// Values need to be sorted to ensure consistent multi-value ordering across different
// segments
Arrays.sort(values);
for (int i = 0; i < size; ++i) {
if (i != 0) {
hasher.putChar(CARDINALITY_AGG_SEPARATOR);
}
hasher.putUnencodedChars(values[i]);
}
}
}
@Override
public Object getRowValueArrayFromColumn(Closeable column, int currRow) {
DictionaryEncodedColumn dict = (DictionaryEncodedColumn) column;
int[] theVals;
if (dict.hasMultipleValues()) {
final IndexedInts dimVals = dict.getMultiValueRow(currRow);
theVals = new int[dimVals.size()];
for (int i = 0; i < theVals.length; ++i) {
theVals[i] = dimVals.get(i);
}
} else {
theVals = new int[1];
theVals[0] = dict.getSingleValueRow(currRow);
}
return theVals;
}