NestedChildrenFilter(
FixedBitSetFilter parentFilter, Filter childFilter, FetchSubPhase.HitContext hitContext) {
this.parentFilter = parentFilter;
this.childFilter = childFilter;
this.docId = hitContext.docId();
this.atomicReader = hitContext.readerContext().reader();
}
@Test
public void testNestedChildrenFilter() throws Exception {
int numParentDocs = scaledRandomIntBetween(0, 32);
int maxChildDocsPerParent = scaledRandomIntBetween(8, 16);
Directory dir = newDirectory();
RandomIndexWriter writer = new RandomIndexWriter(random(), dir);
for (int i = 0; i < numParentDocs; i++) {
int numChildDocs = scaledRandomIntBetween(0, maxChildDocsPerParent);
List<Document> docs = new ArrayList<>(numChildDocs + 1);
for (int j = 0; j < numChildDocs; j++) {
Document childDoc = new Document();
childDoc.add(new StringField("type", "child", Field.Store.NO));
docs.add(childDoc);
}
Document parenDoc = new Document();
parenDoc.add(new StringField("type", "parent", Field.Store.NO));
parenDoc.add(new IntField("num_child_docs", numChildDocs, Field.Store.YES));
docs.add(parenDoc);
writer.addDocuments(docs);
}
IndexReader reader = writer.getReader();
writer.close();
IndexSearcher searcher = new IndexSearcher(reader);
FetchSubPhase.HitContext hitContext = new FetchSubPhase.HitContext();
BitDocIdSetFilter parentFilter =
new BitDocIdSetCachingWrapperFilter(
new QueryWrapperFilter(new TermQuery(new Term("type", "parent"))));
Filter childFilter = new QueryWrapperFilter(new TermQuery(new Term("type", "child")));
int checkedParents = 0;
for (LeafReaderContext leaf : reader.leaves()) {
DocIdSetIterator parents = parentFilter.getDocIdSet(leaf).iterator();
for (int parentDoc = parents.nextDoc();
parentDoc != DocIdSetIterator.NO_MORE_DOCS;
parentDoc = parents.nextDoc()) {
int expectedChildDocs =
leaf.reader().document(parentDoc).getField("num_child_docs").numericValue().intValue();
hitContext.reset(null, leaf, parentDoc, searcher);
NestedChildrenFilter nestedChildrenFilter =
new NestedChildrenFilter(parentFilter, childFilter, hitContext);
TotalHitCountCollector totalHitCountCollector = new TotalHitCountCollector();
searcher.search(new ConstantScoreQuery(nestedChildrenFilter), totalHitCountCollector);
assertThat(totalHitCountCollector.getTotalHits(), equalTo(expectedChildDocs));
checkedParents++;
}
}
assertThat(checkedParents, equalTo(numParentDocs));
reader.close();
dir.close();
}
@Override
public TopDocs topDocs(SearchContext context, FetchSubPhase.HitContext hitContext)
throws IOException {
final String field;
final String term;
if (isParentHit(hitContext.hit())) {
field = ParentFieldMapper.NAME;
term = Uid.createUid(hitContext.hit().type(), hitContext.hit().id());
} else if (isChildHit(hitContext.hit())) {
field = UidFieldMapper.NAME;
SearchHitField parentField = hitContext.hit().field(ParentFieldMapper.NAME);
if (parentField != null) {
term = parentField.getValue();
} else {
SingleFieldsVisitor fieldsVisitor = new SingleFieldsVisitor(ParentFieldMapper.NAME);
hitContext.reader().document(hitContext.docId(), fieldsVisitor);
if (fieldsVisitor.fields().isEmpty()) {
return Lucene.EMPTY_TOP_DOCS;
}
term = (String) fieldsVisitor.fields().get(ParentFieldMapper.NAME).get(0);
}
} else {
return Lucene.EMPTY_TOP_DOCS;
}
// Only include docs that have the current hit as parent
Filter filter = new TermFilter(new Term(field, term));
// Only include docs that have this inner hits type
Filter typeFilter = documentMapper.typeFilter();
if (size() == 0) {
TotalHitCountCollector collector = new TotalHitCountCollector();
context
.searcher()
.search(
new XFilteredQuery(query, new AndFilter(Arrays.asList(filter, typeFilter))),
collector);
return new TopDocs(collector.getTotalHits(), Lucene.EMPTY_SCORE_DOCS, 0);
} else {
int topN = from() + size();
TopDocsCollector topDocsCollector;
if (sort() != null) {
topDocsCollector =
TopFieldCollector.create(sort(), topN, true, trackScores(), trackScores(), false);
} else {
topDocsCollector = TopScoreDocCollector.create(topN, false);
}
context
.searcher()
.search(
new XFilteredQuery(query, new AndFilter(Arrays.asList(filter, typeFilter))),
topDocsCollector);
return topDocsCollector.topDocs(from(), size());
}
}
@Override
public HighlightField highlight(HighlighterContext highlighterContext) {
SearchContextHighlight.Field field = highlighterContext.field;
SearchContext context = highlighterContext.context;
FetchSubPhase.HitContext hitContext = highlighterContext.hitContext;
FieldMapper mapper = highlighterContext.mapper;
if (canHighlight(mapper) == false) {
throw new IllegalArgumentException(
"the field ["
+ highlighterContext.fieldName
+ "] should be indexed with term vector with position offsets to be used with fast vector highlighter");
}
Encoder encoder =
field.fieldOptions().encoder().equals("html")
? HighlightUtils.Encoders.HTML
: HighlightUtils.Encoders.DEFAULT;
if (!hitContext.cache().containsKey(CACHE_KEY)) {
hitContext.cache().put(CACHE_KEY, new HighlighterEntry());
}
HighlighterEntry cache = (HighlighterEntry) hitContext.cache().get(CACHE_KEY);
try {
FieldQuery fieldQuery;
if (field.fieldOptions().requireFieldMatch()) {
if (cache.fieldMatchFieldQuery == null) {
/*
* we use top level reader to rewrite the query against all readers, with use caching it across hits (and across
* readers...)
*/
cache.fieldMatchFieldQuery =
new CustomFieldQuery(
highlighterContext.query,
hitContext.topLevelReader(),
true,
field.fieldOptions().requireFieldMatch());
}
fieldQuery = cache.fieldMatchFieldQuery;
} else {
if (cache.noFieldMatchFieldQuery == null) {
/*
* we use top level reader to rewrite the query against all readers, with use caching it across hits (and across
* readers...)
*/
cache.noFieldMatchFieldQuery =
new CustomFieldQuery(
highlighterContext.query,
hitContext.topLevelReader(),
true,
field.fieldOptions().requireFieldMatch());
}
fieldQuery = cache.noFieldMatchFieldQuery;
}
MapperHighlightEntry entry = cache.mappers.get(mapper);
if (entry == null) {
FragListBuilder fragListBuilder;
BaseFragmentsBuilder fragmentsBuilder;
BoundaryScanner boundaryScanner = DEFAULT_BOUNDARY_SCANNER;
if (field.fieldOptions().boundaryMaxScan() != SimpleBoundaryScanner.DEFAULT_MAX_SCAN
|| field.fieldOptions().boundaryChars()
!= SimpleBoundaryScanner.DEFAULT_BOUNDARY_CHARS) {
boundaryScanner =
new SimpleBoundaryScanner(
field.fieldOptions().boundaryMaxScan(), field.fieldOptions().boundaryChars());
}
boolean forceSource = context.highlight().forceSource(field);
if (field.fieldOptions().numberOfFragments() == 0) {
fragListBuilder = new SingleFragListBuilder();
if (!forceSource && mapper.fieldType().stored()) {
fragmentsBuilder =
new SimpleFragmentsBuilder(
mapper,
field.fieldOptions().preTags(),
field.fieldOptions().postTags(),
boundaryScanner);
} else {
fragmentsBuilder =
new SourceSimpleFragmentsBuilder(
mapper,
context,
field.fieldOptions().preTags(),
field.fieldOptions().postTags(),
boundaryScanner);
}
} else {
fragListBuilder =
field.fieldOptions().fragmentOffset() == -1
? new SimpleFragListBuilder()
: new SimpleFragListBuilder(field.fieldOptions().fragmentOffset());
if (field.fieldOptions().scoreOrdered()) {
if (!forceSource && mapper.fieldType().stored()) {
fragmentsBuilder =
new ScoreOrderFragmentsBuilder(
field.fieldOptions().preTags(),
field.fieldOptions().postTags(),
boundaryScanner);
} else {
fragmentsBuilder =
new SourceScoreOrderFragmentsBuilder(
mapper,
context,
field.fieldOptions().preTags(),
field.fieldOptions().postTags(),
boundaryScanner);
}
} else {
if (!forceSource && mapper.fieldType().stored()) {
fragmentsBuilder =
new SimpleFragmentsBuilder(
mapper,
field.fieldOptions().preTags(),
field.fieldOptions().postTags(),
boundaryScanner);
} else {
fragmentsBuilder =
new SourceSimpleFragmentsBuilder(
mapper,
context,
field.fieldOptions().preTags(),
field.fieldOptions().postTags(),
boundaryScanner);
}
}
}
fragmentsBuilder.setDiscreteMultiValueHighlighting(termVectorMultiValue);
entry = new MapperHighlightEntry();
entry.fragListBuilder = fragListBuilder;
entry.fragmentsBuilder = fragmentsBuilder;
if (cache.fvh == null) {
// parameters to FVH are not requires since:
// first two booleans are not relevant since they are set on the CustomFieldQuery (phrase
// and fieldMatch)
// fragment builders are used explicitly
cache.fvh = new org.apache.lucene.search.vectorhighlight.FastVectorHighlighter();
}
CustomFieldQuery.highlightFilters.set(field.fieldOptions().highlightFilter());
cache.mappers.put(mapper, entry);
}
cache.fvh.setPhraseLimit(field.fieldOptions().phraseLimit());
String[] fragments;
// a HACK to make highlighter do highlighting, even though its using the single frag list
// builder
int numberOfFragments =
field.fieldOptions().numberOfFragments() == 0
? Integer.MAX_VALUE
: field.fieldOptions().numberOfFragments();
int fragmentCharSize =
field.fieldOptions().numberOfFragments() == 0
? Integer.MAX_VALUE
: field.fieldOptions().fragmentCharSize();
// we highlight against the low level reader and docId, because if we load source, we want to
// reuse it if possible
// Only send matched fields if they were requested to save time.
if (field.fieldOptions().matchedFields() != null
&& !field.fieldOptions().matchedFields().isEmpty()) {
fragments =
cache.fvh.getBestFragments(
fieldQuery,
hitContext.reader(),
hitContext.docId(),
mapper.fieldType().name(),
field.fieldOptions().matchedFields(),
fragmentCharSize,
numberOfFragments,
entry.fragListBuilder,
entry.fragmentsBuilder,
field.fieldOptions().preTags(),
field.fieldOptions().postTags(),
encoder);
} else {
fragments =
cache.fvh.getBestFragments(
fieldQuery,
hitContext.reader(),
hitContext.docId(),
mapper.fieldType().name(),
fragmentCharSize,
numberOfFragments,
entry.fragListBuilder,
entry.fragmentsBuilder,
field.fieldOptions().preTags(),
field.fieldOptions().postTags(),
encoder);
}
if (fragments != null && fragments.length > 0) {
return new HighlightField(
highlighterContext.fieldName, Text.convertFromStringArray(fragments));
}
int noMatchSize = highlighterContext.field.fieldOptions().noMatchSize();
if (noMatchSize > 0) {
// Essentially we just request that a fragment is built from 0 to noMatchSize using the
// normal fragmentsBuilder
FieldFragList fieldFragList = new SimpleFieldFragList(-1 /*ignored*/);
fieldFragList.add(0, noMatchSize, Collections.<WeightedPhraseInfo>emptyList());
fragments =
entry.fragmentsBuilder.createFragments(
hitContext.reader(),
hitContext.docId(),
mapper.fieldType().name(),
fieldFragList,
1,
field.fieldOptions().preTags(),
field.fieldOptions().postTags(),
encoder);
if (fragments != null && fragments.length > 0) {
return new HighlightField(
highlighterContext.fieldName, Text.convertFromStringArray(fragments));
}
}
return null;
} catch (Exception e) {
throw new FetchPhaseExecutionException(
context, "Failed to highlight field [" + highlighterContext.fieldName + "]", e);
}
}
