@Override
public RandomAccessDocIdSet getRandomAccessDocIdSet(BoboIndexReader reader) throws IOException {
RandomAccessDocIdSet innerDocSet = _facetFilter.getRandomAccessDocIdSet(reader);
if (innerDocSet == EmptyDocIdSet.getInstance()) {
return innerDocSet;
}
FacetDataCache dataCache = _facetDataCacheBuilder.build(reader);
int totalCount = reader.maxDoc();
TermValueList valArray = dataCache.valArray;
int freqCount = 0;
ArrayList<String> validVals = new ArrayList<String>(_valSet.size());
for (String val : _valSet) {
int idx = valArray.indexOf(val);
if (idx >= 0) {
validVals.add(valArray.get(idx)); // get and format the value
freqCount += dataCache.freqs[idx];
}
}
if (validVals.size() == 0) {
return EmptyDocIdSet.getInstance();
}
// takeComplement is only used to choose between TermListRandomAccessDocIdSet and innerDocSet
int validFreqCount = _takeComplement ? (totalCount - freqCount) : freqCount;
if (_facetDataCacheBuilder.getName() != null && ((validFreqCount << 1) < totalCount)) {
return new TermListRandomAccessDocIdSet(
_facetDataCacheBuilder.getName(), innerDocSet, validVals, reader);
} else {
return innerDocSet;
}
}
public double getFacetSelectivity(BoboIndexReader reader) {
double selectivity = _facetFilter.getFacetSelectivity(reader);
if (_takeComplement) return 1.0 - selectivity;
return selectivity;
}
