private List<FacetMatch> FindMatchesInQuery(Facet facet, Filter query, Filter filter, IndexReader indexReader)
{
var matches = facet.Values.Select(value =>
{
var bitsQuery = new OpenBitSetDISI(query.GetDocIdSet(indexReader).Iterator(), indexReader.MaxDoc());
bitsQuery.And(value.Item2);
if (filter != null)
{
//TODO: Remove this hard coded value (1000)
var bitsFilter = new OpenBitSetDISI(filter.GetDocIdSet(indexReader).Iterator(), 1000);
bitsQuery.And(bitsFilter);
}
var count = bitsQuery.Cardinality();
return new FacetMatch() { Count = count, Value = value.Item1, Id = facet.Id };
}).ToList();
return matches;
}
private IEnumerable<FacetMatch> FindMatchesInQuery(Query baseQueryWithoutFacetDrilldown, IList<FacetFieldInfo> allFacetFieldInfos, FacetFieldInfo facetFieldInfoToCalculateFor)
{
var calculations = 0;
var queryFilter = new CachingWrapperFilter(new QueryWrapperFilter(CreateFacetedQuery(baseQueryWithoutFacetDrilldown, allFacetFieldInfos, facetFieldInfoToCalculateFor.FieldName)));
var bitsQueryWithoutFacetDrilldown = new OpenBitSetDISI(queryFilter.GetDocIdSet(IndexReader).Iterator(), IndexReader.MaxDoc);
var baseQueryWithoutFacetDrilldownCopy = new OpenBitSetDISI(bitsQueryWithoutFacetDrilldown.Bits.Length)
{
Bits = new long[bitsQueryWithoutFacetDrilldown.Bits.Length]
};
var calculatedFacetCounts = new ResultCollection(facetFieldInfoToCalculateFor);
foreach (var facetValueBitSet in GetOrCreateFacetBitSet(facetFieldInfoToCalculateFor.FieldName).FacetValueBitSetList)
{
var isSelected = calculatedFacetCounts.IsSelected(facetValueBitSet.Value);
if (!isSelected && facetValueBitSet.Count < calculatedFacetCounts.MinCountForNonSelected) //Impossible to get a better result
{
if (calculatedFacetCounts.HaveEnoughResults)
break;
}
bitsQueryWithoutFacetDrilldown.Bits.CopyTo(baseQueryWithoutFacetDrilldownCopy.Bits, 0);
baseQueryWithoutFacetDrilldownCopy.NumWords = bitsQueryWithoutFacetDrilldown.NumWords;
var bitset = facetValueBitSet.Bitset ?? CalculateOpenBitSetDisi(facetFieldInfoToCalculateFor.FieldName, facetValueBitSet.Value);
baseQueryWithoutFacetDrilldownCopy.And(bitset);
var count = baseQueryWithoutFacetDrilldownCopy.Cardinality();
if (count == 0)
continue;
var match = new FacetMatch
{
Count = count,
Value = facetValueBitSet.Value,
FacetFieldName = facetFieldInfoToCalculateFor.FieldName
};
calculations++;
if (isSelected)
calculatedFacetCounts.AddToSelected(match);
else
calculatedFacetCounts.AddToNonSelected(match);
}
return calculatedFacetCounts.GetList();
}
// TODO: in 3.0, instead of removing this deprecated
// method, make it a no-op and mark it final
/** Provide a SortedVIntList when it is definitely smaller
* than an OpenBitSet.
* @deprecated Either use CachingWrapperFilter, or
* switch to a different DocIdSet implementation yourself. */
protected DocIdSet FinalResult(OpenBitSetDISI result, int maxDocs)
{
return (result.Cardinality() < (maxDocs / 9))
? (DocIdSet)new SortedVIntList(result)
: (DocIdSet)result;
}
public SimpleFacetedSearch(IndexReader reader, string[] groupByFields)
{
this._Reader = reader;
List<FieldValuesBitSets> fieldValuesBitSets = new List<FieldValuesBitSets>();
//STEP 1
//f1 = A, B
//f2 = I, J
//f3 = 1, 2, 3
int maxFacets = 1;
List<List<string>> inputToCP = new List<List<string>>();
foreach (string field in groupByFields)
{
FieldValuesBitSets f = new FieldValuesBitSets(reader, field);
maxFacets *= f.FieldValueBitSetPair.Count;
if (maxFacets > MAX_FACETS) throw new Exception("Facet count exceeded " + MAX_FACETS);
fieldValuesBitSets.Add(f);
inputToCP.Add(f.FieldValueBitSetPair.Keys.ToList());
}
//STEP 2
// comb1: A I 1
// comb2: A I 2 etc.
var cp = inputToCP.CartesianProduct();
//SETP 3
//create a single BitSet for each combination
//BitSet1: A AND I AND 1
//BitSet2: A AND I AND 2 etc.
//and remove impossible comb's (for ex, B J 3) from list.
Parallel.ForEach(cp, combinations =>
{
OpenBitSetDISI bitSet = new OpenBitSetDISI(_Reader.MaxDoc());
bitSet.Set(0, bitSet.Size());
List<string> comb = combinations.ToList();
for (int j = 0; j < comb.Count; j++)
{
bitSet.And(fieldValuesBitSets[j].FieldValueBitSetPair[comb[j]]);
}
//STEP 3
if (bitSet.Cardinality() > 0)
{
lock(_Groups)
_Groups.Add(new KeyValuePair<List<string>, OpenBitSetDISI>(comb, bitSet));
}
});
//Now _Groups has 7 rows (as <List<string>, BitSet> pairs)
}
public IEnumerable<IHit> Query(int pageIndex, int pageSize, out int totalCount, out IEnumerable<FacetGroup> facetedResults)
{
totalCount = 0;
facetedResults = null;
if (searchPaths == null || searchPaths.Count <= 0)
searchPaths.AddRange(indexPaths.Values.Select(o => o.Path));
List<LuceneHit> results = new List<LuceneHit>();
List<IndexSearcher> subSearchs = new List<IndexSearcher>();
searchPaths.ForEach(o => subSearchs.Add(new IndexSearcher(FSDirectory.Open(o))));
if (facetFields != null && facetFields.Count > 0)
{
var facetGroups = new List<FacetGroup>();
var mainQueryFilter = new CachingWrapperFilter(new QueryWrapperFilter(query));
MultiReader readers = new MultiReader(subSearchs.Select(o => o.IndexReader).ToArray());
foreach (var facetField in facetFields)
{
FacetGroup fg = new FacetGroup();
fg.FieldName = facetFieldNameProvider.GetMapName(TypeName, facetField);
var items = new List<FacetItem>();
var allDistinctField = FieldCache_Fields.DEFAULT.GetStrings(readers, facetField).Distinct().ToArray();
int totalHits = 0;
Parallel.ForEach(allDistinctField, fieldValue =>
{
//foreach (var fieldValue in allDistinctField)
//{
var facetQuery = new TermQuery(new Term(facetField, fieldValue));
var facetQueryFilter = new CachingWrapperFilter(new QueryWrapperFilter(facetQuery));
var bs = new OpenBitSetDISI(facetQueryFilter.GetDocIdSet(readers).Iterator(), readers.MaxDoc);
bs.InPlaceAnd(mainQueryFilter.GetDocIdSet(readers).Iterator());
int count = (Int32)bs.Cardinality();
FacetItem item = new FacetItem();
item.GroupValue = fieldValue;
item.Count = count;
items.Add(item);
totalHits += count;
}
);
fg.FacetItems = items.OrderByDescending(o => o.Count);
fg.TotalHits = totalHits;
facetGroups.Add(fg);
}
facetedResults = facetGroups.OrderBy(o => o.FieldName);
}
ParallelMultiSearcher searcher = new ParallelMultiSearcher(subSearchs.ToArray());
Sort sort = null;
if (sortFields != null && sortFields.Count > 0)
{
sort = new Sort(sortFields.ToArray());
}
int maxDoc = searcher.MaxDoc;
int startIndex = 0;
if (pageIndex >= 0 && pageSize > 0)
{
startIndex = pageIndex * pageSize;
maxDoc = pageSize * (pageIndex + 1);
}
var docs = sort == null ? searcher.Search(query, null, maxDoc) : searcher.Search(query, null, maxDoc, sort);
totalCount = docs.TotalHits;
int endIndex = docs.TotalHits - startIndex;
for (int i = startIndex; i < endIndex; i++)
{
LuceneHit h = new LuceneHit(TypeName, DocumentBuilder, searcher.Doc(docs.ScoreDocs[i].Doc));
results.Add(h);
}
return results;
}
private static long CalculateFacetCount(DocIdSet baseBitSet, DocIdSet filterDocSet)
{
var baseDisi = new OpenBitSetDISI(baseBitSet.Iterator(), 25000);
var filterIterator = filterDocSet.Iterator();
baseDisi.InPlaceAnd(filterIterator);
var total = baseDisi.Cardinality();
return total;
}