Deduce default value in hit collector.

4 files changed, 14 insertions, 7 deletions

diff --git a/searchcore/src/vespa/searchcore/proton/matching/match_params.h b/searchcore/src/vespa/searchcore/proton/matching/match_params.h
index 5b58c11b7e1..f9dd55e7bb1 100644
--- a/searchcore/src/vespa/searchcore/proton/matching/match_params.h
+++ b/searchcore/src/vespa/searchcore/proton/matching/match_params.h
@@ -27,7 +27,7 @@ struct MatchParams {
                 uint32_t          hits_in,
                 bool              hasFinalRank,
                 bool              needRanking=true);
-    bool save_rank_scores() const { return ((heapSize + arraySize) != 0); }
+    bool save_rank_scores() const noexcept { return (arraySize != 0); }
     bool has_rank_drop_limit() const;
 };
 
diff --git a/searchcore/src/vespa/searchcore/proton/matching/match_thread.cpp b/searchcore/src/vespa/searchcore/proton/matching/match_thread.cpp
index 211e67f1e2b..6b443231c0a 100644
--- a/searchcore/src/vespa/searchcore/proton/matching/match_thread.cpp
+++ b/searchcore/src/vespa/searchcore/proton/matching/match_thread.cpp
@@ -367,7 +367,7 @@ MatchThread::findMatches(MatchTools &tools)
         tools.give_back_search(ProfiledIterator::profile(*match_profiler, tools.borrow_search()));
         tools.tag_search_as_changed();
     }
-    HitCollector hits(matchParams.numDocs, matchParams.arraySize);
+    HitCollector hits(matchParams.numDocs, match_with_ranking ? matchParams.arraySize : 0);
     trace->addEvent(4, "Start match and first phase rank");
     /**
      * All, or none of the threads in the bundle must execute the match loop.
@@ -380,7 +380,7 @@ MatchThread::findMatches(MatchTools &tools)
         secondPhase(tools, hits);
     }
     trace->addEvent(4, "Create result set");
-    return hits.getResultSet(fallback_rank_value());
+    return hits.getResultSet();
 }
 
 void
diff --git a/searchlib/src/vespa/searchlib/queryeval/hitcollector.cpp b/searchlib/src/vespa/searchlib/queryeval/hitcollector.cpp
index c1d59463ad9..698593cfd8e 100644
--- a/searchlib/src/vespa/searchlib/queryeval/hitcollector.cpp
+++ b/searchlib/src/vespa/searchlib/queryeval/hitcollector.cpp
@@ -269,8 +269,14 @@ mixin_rescored_hits(ResultSet& rs, const std::vector<HitCollector::Hit>& hits, c
 }
 
 std::unique_ptr<ResultSet>
-HitCollector::getResultSet(HitRank default_value)
+HitCollector::getResultSet()
 {
+    /*
+     * Use default_rank_value (i.e. -HUGE_VAL) when hit collector saves
+     * rank scores, otherwise use zero_rank_value (i.e. 0.0).
+     */
+    auto default_value = save_rank_scores() ? search::default_rank_value : search::zero_rank_value;
+
     bool needReScore = FirstPhaseRescorer::need_rescore(_ranges);
     FirstPhaseRescorer rescorer(_ranges);
 
diff --git a/searchlib/src/vespa/searchlib/queryeval/hitcollector.h b/searchlib/src/vespa/searchlib/queryeval/hitcollector.h
index 903c2ab5b13..fe1d486ff2a 100644
--- a/searchlib/src/vespa/searchlib/queryeval/hitcollector.h
+++ b/searchlib/src/vespa/searchlib/queryeval/hitcollector.h
@@ -121,6 +121,8 @@ private:
     VESPA_DLL_LOCAL void sortHitsByScore(size_t topn);
     VESPA_DLL_LOCAL void sortHitsByDocId();
 
+    bool save_rank_scores() const noexcept { return _maxHitsSize != 0; }
+
 public:
     HitCollector(const HitCollector &) = delete;
     HitCollector &operator=(const HitCollector &) = delete;
@@ -169,10 +171,9 @@ public:
      * Invoking this method will destroy the heap property of the
      * ranked hits and the match data heap.
      *
-     * @param auto pointer to the result set
-     * @param default_value rank value to be used for results without rank value
+     * @return unique pointer to the result set
      **/
-    std::unique_ptr<ResultSet> getResultSet(HitRank default_value = default_rank_value);
+    std::unique_ptr<ResultSet> getResultSet();
 };
 
 }