1 files changed, 10 insertions, 0 deletions
diff --git a/src/mongo/db/query/query_solution.cpp b/src/mongo/db/query/query_solution.cpp
index da1fa79c034..e2168669187 100644
--- a/src/mongo/db/query/query_solution.cpp
+++ b/src/mongo/db/query/query_solution.cpp
@@ -501,6 +501,16 @@ void IndexScanNode::computeProperties() {
             }
             equalityFields.insert(oil.name);
         }
+    } else {
+        BSONObjIterator keyIter(indexKeyPattern);
+        BSONObjIterator startIter(bounds.startKey);
+        BSONObjIterator endIter(bounds.endKey);
+        while (keyIter.more() && startIter.more() && endIter.more()) {
+            BSONElement key = keyIter.next();
+            if (startIter.next() == endIter.next()) {
+                equalityFields.insert(key.fieldName());
+            }
+        }
     }
 
     if (equalityFields.empty()) {