From 8fad762fabfed2140dcd356896b661efaf7e1cb1 Mon Sep 17 00:00:00 2001 From: Julie Tibshirani Date: Thu, 29 Aug 2019 09:15:31 -0700 Subject: [PATCH] Ensure top docs optimization is fully disabled for queries with unbounded max scores. (#46105) When a query contains a mandatory clause that doesn't track the max score per block, we disable the max score optimization. Previously, we were doing this by wrapping the collector with a FilterCollector that always returned ScoreMode.COMPLETE. However we weren't adjusting totalHitsThreshold, so the collector could still call Scorer#setMinCompetitiveScore. It is against the method contract to call setMinCompetitiveScore when the score mode is COMPLETE, and some scorers like ReqOptSumScorer throw an error in this case. This commit tries to disable the optimization by always setting totalHitsThreshold to max int, as opposed to wrapping the collector. --- .../search/query/TopDocsCollectorContext.java | 34 ++++++------------- .../search/query/QueryPhaseTests.java | 9 ++--- 2 files changed, 15 insertions(+), 28 deletions(-) diff --git a/server/src/main/java/org/elasticsearch/search/query/TopDocsCollectorContext.java b/server/src/main/java/org/elasticsearch/search/query/TopDocsCollectorContext.java index 5ae6cc739c362..751c1cd8bfbe7 100644 --- a/server/src/main/java/org/elasticsearch/search/query/TopDocsCollectorContext.java +++ b/server/src/main/java/org/elasticsearch/search/query/TopDocsCollectorContext.java @@ -33,13 +33,11 @@ import org.apache.lucene.search.ConstantScoreQuery; import org.apache.lucene.search.DocValuesFieldExistsQuery; import org.apache.lucene.search.FieldDoc; -import org.apache.lucene.search.FilterCollector; import org.apache.lucene.search.MatchAllDocsQuery; import org.apache.lucene.search.MultiCollector; import org.apache.lucene.search.Query; import org.apache.lucene.search.QueryVisitor; import org.apache.lucene.search.ScoreDoc; -import org.apache.lucene.search.ScoreMode; import org.apache.lucene.search.Sort; import org.apache.lucene.search.SortField; import org.apache.lucene.search.TermQuery; @@ -238,7 +236,15 @@ private SimpleTopDocsCollectorContext(IndexReader reader, this.sortAndFormats = sortAndFormats; final TopDocsCollector topDocsCollector; - if (trackTotalHitsUpTo == SearchContext.TRACK_TOTAL_HITS_DISABLED) { + + if ((sortAndFormats == null || SortField.FIELD_SCORE.equals(sortAndFormats.sort.getSort()[0])) + && hasInfMaxScore(query)) { + // disable max score optimization since we have a mandatory clause + // that doesn't track the maximum score + topDocsCollector = createCollector(sortAndFormats, numHits, searchAfter, Integer.MAX_VALUE); + topDocsSupplier = new CachedSupplier<>(topDocsCollector::topDocs); + totalHitsSupplier = () -> topDocsSupplier.get().totalHits; + } else if (trackTotalHitsUpTo == SearchContext.TRACK_TOTAL_HITS_DISABLED) { // don't compute hit counts via the collector topDocsCollector = createCollector(sortAndFormats, numHits, searchAfter, 1); topDocsSupplier = new CachedSupplier<>(topDocsCollector::topDocs); @@ -274,27 +280,7 @@ private SimpleTopDocsCollectorContext(IndexReader reader, maxScoreSupplier = () -> Float.NaN; } - final Collector collector = MultiCollector.wrap(topDocsCollector, maxScoreCollector); - if (sortAndFormats == null || - SortField.FIELD_SCORE.equals(sortAndFormats.sort.getSort()[0])) { - if (hasInfMaxScore(query)) { - // disable max score optimization since we have a mandatory clause - // that doesn't track the maximum score - this.collector = new FilterCollector(collector) { - @Override - public ScoreMode scoreMode() { - if (in.scoreMode() == ScoreMode.TOP_SCORES) { - return ScoreMode.COMPLETE; - } - return in.scoreMode(); - } - }; - } else { - this.collector = collector; - } - } else { - this.collector = collector; - } + this.collector = MultiCollector.wrap(topDocsCollector, maxScoreCollector); } diff --git a/server/src/test/java/org/elasticsearch/search/query/QueryPhaseTests.java b/server/src/test/java/org/elasticsearch/search/query/QueryPhaseTests.java index 192e54506495f..2190e573707e6 100644 --- a/server/src/test/java/org/elasticsearch/search/query/QueryPhaseTests.java +++ b/server/src/test/java/org/elasticsearch/search/query/QueryPhaseTests.java @@ -606,15 +606,16 @@ public void testDisableTopScoreCollection() throws Exception { .build(); context.parsedQuery(new ParsedQuery(q)); - context.setSize(10); + context.setSize(3); + context.trackTotalHitsUpTo(3); + TopDocsCollectorContext topDocsContext = TopDocsCollectorContext.createTopDocsCollectorContext(context, reader, false); assertEquals(topDocsContext.create(null).scoreMode(), org.apache.lucene.search.ScoreMode.COMPLETE); QueryPhase.execute(context, contextSearcher, checkCancelled -> {}); assertEquals(5, context.queryResult().topDocs().topDocs.totalHits.value); assertEquals(context.queryResult().topDocs().topDocs.totalHits.relation, TotalHits.Relation.EQUAL_TO); - assertThat(context.queryResult().topDocs().topDocs.scoreDocs.length, equalTo(5)); - + assertThat(context.queryResult().topDocs().topDocs.scoreDocs.length, equalTo(3)); context.sort(new SortAndFormats(new Sort(new SortField("other", SortField.Type.INT)), new DocValueFormat[] { DocValueFormat.RAW })); @@ -623,7 +624,7 @@ public void testDisableTopScoreCollection() throws Exception { assertEquals(topDocsContext.create(null).scoreMode(), org.apache.lucene.search.ScoreMode.COMPLETE_NO_SCORES); QueryPhase.execute(context, contextSearcher, checkCancelled -> {}); assertEquals(5, context.queryResult().topDocs().topDocs.totalHits.value); - assertThat(context.queryResult().topDocs().topDocs.scoreDocs.length, equalTo(5)); + assertThat(context.queryResult().topDocs().topDocs.scoreDocs.length, equalTo(3)); assertEquals(context.queryResult().topDocs().topDocs.totalHits.relation, TotalHits.Relation.EQUAL_TO); reader.close();