add collect_block to BoxableSegmentCollector (#2331)

src/collector/multi_collector.rs

@@ -52,10 +52,16 @@ impl<TCollector: Collector> Collector for CollectorWrapper<TCollector> {
 impl SegmentCollector for Box<dyn BoxableSegmentCollector> {
     type Fruit = Box<dyn Fruit>;
 
+    #[inline]
     fn collect(&mut self, doc: u32, score: Score) {
         self.as_mut().collect(doc, score);
     }
 
+    #[inline]
+    fn collect_block(&mut self, docs: &[DocId]) {
+        self.as_mut().collect_block(docs);
+    }
+
     fn harvest(self) -> Box<dyn Fruit> {
         BoxableSegmentCollector::harvest_from_box(self)
     }
@@ -63,6 +69,11 @@ impl SegmentCollector for Box<dyn BoxableSegmentCollector> {
 
 pub trait BoxableSegmentCollector {
     fn collect(&mut self, doc: u32, score: Score);
+    fn collect_block(&mut self, docs: &[DocId]) {
+        for &doc in docs {
+            self.collect(doc, 0.0);
+        }
+    }
     fn harvest_from_box(self: Box<Self>) -> Box<dyn Fruit>;
 }
 
@@ -71,9 +82,14 @@ pub struct SegmentCollectorWrapper<TSegmentCollector: SegmentCollector>(TSegment
 impl<TSegmentCollector: SegmentCollector> BoxableSegmentCollector
     for SegmentCollectorWrapper<TSegmentCollector>
 {
+    #[inline]
     fn collect(&mut self, doc: u32, score: Score) {
         self.0.collect(doc, score);
     }
+    #[inline]
+    fn collect_block(&mut self, docs: &[DocId]) {
+        self.0.collect_block(docs);
+    }
 
     fn harvest_from_box(self: Box<Self>) -> Box<dyn Fruit> {
         Box::new(self.0.harvest())