jpountz commented on a change in pull request #242:
URL: https://github.com/apache/lucene/pull/242#discussion_r694668737



##########
File path: lucene/core/src/java/org/apache/lucene/search/TermQuery.java
##########
@@ -179,6 +179,15 @@ public Explanation explain(LeafReaderContext context, int 
doc) throws IOExceptio
       }
       return Explanation.noMatch("no matching term");
     }
+
+    @Override
+    public int count(LeafReaderContext context) throws IOException {
+      if (context.reader().hasDeletions() == false) {
+        return context.reader().docFreq(term);

Review comment:
       Maybe we should reuse the term state if available so that we can 
directly seek to the place where this term is stored in the terms dict instead 
of looking it up a second time?




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