1 files changed, 8 insertions, 1 deletions
diff --git a/src/mongo/db/query/canonical_query.h b/src/mongo/db/query/canonical_query.h
index db2cb578b12..392c75ca704 100644
--- a/src/mongo/db/query/canonical_query.h
+++ b/src/mongo/db/query/canonical_query.h
@@ -148,6 +148,13 @@ public:
     static Status isValid(MatchExpression* root, const QueryRequest& parsed);
 
     /**
+     * Returns the normalized version of the subtree rooted at 'root'.
+     *
+     * Takes ownership of 'root'.
+     */
+    static MatchExpression* normalizeTree(MatchExpression* root);
+
+    /**
      * Traverses expression tree post-order.
      * Sorts children at each non-leaf node by (MatchType, path(), children, number of children)
      */
@@ -185,7 +192,7 @@ private:
 
     Status init(std::unique_ptr<QueryRequest> qr,
                 bool canHaveNoopMatchNodes,
-                std::unique_ptr<MatchExpression> root,
+                MatchExpression* root,
                 std::unique_ptr<CollatorInterface> collator);
 
     std::unique_ptr<QueryRequest> _qr;