cbuescher commented on a change in pull request #913: LUCENE-8995:
TopSuggestDocsCollector#collect should be able to signal rejection
URL: https://github.com/apache/lucene-solr/pull/913#discussion_r335502868
##########
File path:
lucene/suggest/src/test/org/apache/lucene/search/suggest/document/TestPrefixCompletionQuery.java
##########
@@ -253,6 +263,123 @@ public void testDocFiltering() throws Exception {
iw.close();
}
+ /**
+ * Test that the correct amount of documents are collected if using a
collector that also rejects documents.
+ */
+ public void testCollectorThatRejects() throws Exception {
+ // use synonym analyzer to have multiple paths to same suggested document.
This mock adds "dog" as synonym for "dogs"
+ Analyzer analyzer = new MockSynonymAnalyzer();
+ RandomIndexWriter iw = new RandomIndexWriter(random(), dir,
iwcWithSuggestField(analyzer, "suggest_field"));
+ List<Entry> expectedResults = new ArrayList<Entry>();
+
+ for (int docCount = 10; docCount > 0; docCount--) {
+ Document document = new Document();
+ String value = "ab" + docCount + " dogs";
+ document.add(new SuggestField("suggest_field", value, docCount));
+ expectedResults.add(new Entry(value, docCount));
+ iw.addDocument(document);
+ }
+
+ if (rarely()) {
+ iw.commit();
+ }
+
+ DirectoryReader reader = iw.getReader();
+ SuggestIndexSearcher indexSearcher = new SuggestIndexSearcher(reader);
+
+ PrefixCompletionQuery query = new PrefixCompletionQuery(analyzer, new
Term("suggest_field", "ab"));
+ int topN = 5;
+
+ // use a TopSuggestDocsCollector that rejects results with duplicate docIds
+ TopSuggestDocsCollector collector = new TopSuggestDocsCollector(topN,
false) {
+
+ private Set<Integer> seenDocIds = new HashSet<>();
+
+ @Override
+ public boolean collect(int docID, CharSequence key, CharSequence
context, float score) throws IOException {
+ int globalDocId = docID + docBase;
+ boolean collected = false;
+ if (seenDocIds.contains(globalDocId) == false) {
+ super.collect(docID, key, context, score);
+ seenDocIds.add(globalDocId);
+ collected = true;
+ }
+ return collected;
+ }
+
+ @Override
+ protected boolean canReject() {
+ return true;
+ }
+ };
+
+ indexSearcher.suggest(query, collector);
+ TopSuggestDocs suggestions = collector.get();
+ assertSuggestions(suggestions, expectedResults.subList(0,
topN).toArray(new Entry[0]));
+ assertTrue(suggestions.isComplete());
Review comment:
This will happen if the estimated queue size in `NRTSuggester#lookup` is not
large enough to accout for all rejected documents, e.g. when in this particular
test we try to get the top 5 of only 5 documents. In that case the queue size
heuristic in `NRTSuggester#getMaxTopNSearcherQueueSize` will only size to queue
to 7 (topN + numDocs/2), which is less than the number of topN + rejections, so
the TopResults returned will have the `isComplete` flag set.
I can add that case to the existing test if this helps.
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