spike-liu commented on a change in pull request #678:
URL: https://github.com/apache/lucene/pull/678#discussion_r807561090



##########
File path: lucene/core/src/java/org/apache/lucene/document/FeatureQuery.java
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@@ -111,12 +111,9 @@ public Explanation explain(LeafReaderContext context, int 
doc) throws IOExceptio
 
       @Override
       public Scorer scorer(LeafReaderContext context) throws IOException {
-        Terms terms = context.reader().terms(fieldName);
-        if (terms == null) {
-          return null;
-        }
+        Terms terms = Terms.terms(context.reader(), fieldName);
         TermsEnum termsEnum = terms.iterator();
-        if (termsEnum.seekExact(new BytesRef(featureName)) == false) {
+        if (!termsEnum.seekExact(new BytesRef(featureName))) {

Review comment:
       Absolutely. Fixed.




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