Avoid frequent dynamic_cast to check if a node is an intermediate.

2 files changed, 3 insertions, 2 deletions

diff --git a/searchlib/src/vespa/searchlib/query/tree/intermediate.h b/searchlib/src/vespa/searchlib/query/tree/intermediate.h
index 2f4323f8e87..2bdc0104927 100644
--- a/searchlib/src/vespa/searchlib/query/tree/intermediate.h
+++ b/searchlib/src/vespa/searchlib/query/tree/intermediate.h
@@ -17,6 +17,7 @@ class Intermediate : public Node
 
     Intermediate() = default;
     virtual ~Intermediate() = 0;
+    bool isIntermediate() const override { return true; }
 
     const std::vector<Node *> &getChildren() const { return _children; }
     Intermediate &reserve(size_t sz) { _children.reserve(sz); return *this; }
diff --git a/searchlib/src/vespa/searchlib/query/tree/node.h b/searchlib/src/vespa/searchlib/query/tree/node.h
index 4ef0d3b6fc8..a5d0479866f 100644
--- a/searchlib/src/vespa/searchlib/query/tree/node.h
+++ b/searchlib/src/vespa/searchlib/query/tree/node.h
@@ -15,9 +15,9 @@ class Node {
  public:
     typedef std::unique_ptr<Node> UP;
 
-    virtual ~Node() {}
-
+    virtual ~Node() = default;
     virtual void accept(QueryVisitor &visitor) = 0;
+    virtual bool isIntermediate() const { return false; }
 };
 
 }