bruno-roustant commented on a change in pull request #797: LUCENE-8921: 
IndexSearcher.termStatistics requires docFreq totalTermFreq instead of 
TermStates
URL: https://github.com/apache/lucene-solr/pull/797#discussion_r307301256
 
 

 ##########
 File path: lucene/core/src/java/org/apache/lucene/search/IndexSearcher.java
 ##########
 @@ -861,17 +861,17 @@ public String toString() {
   
   /**
    * Returns {@link TermStatistics} for a term, or {@code null} if
-   * the term does not exist.
+   * the term does not exist (if docFreq == 0).
    * 
    * This can be overridden for example, to return a term's statistics
    * across a distributed collection.
    * @lucene.experimental
    */
-  public TermStatistics termStatistics(Term term, TermStates context) throws 
IOException {
-    if (context.docFreq() == 0) {
+  public TermStatistics termStatistics(Term term, int docFreq, long 
totalTermFreq) throws IOException {
+    if (docFreq == 0) {
 
 Review comment:
   Previously all callers checked if the returned TermStatistics was null 
before doing something. So I replaced the null check by a check if docFreq is 0.
   I tried to remove the 0 check and ran TestShardSearching (which extends 
ShardSearchingTestBase I modified). It failed with the exception because 
docFreq was 0.
   I think this check is necessary, unless some specific class is sure docFreq 
will always be > 0. It this case it would not previously check null.

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