mikemccand 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_r334996216
##########
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) {
Review comment:
Hmm why would the suggester even send the same `docID` multiple times?
There is only one suggestion (`SuggestField`) per indexed document in this test
... maybe improve the test to assert that sometimes we reject and sometimes we
don't?
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