1 files changed, 14 insertions, 1 deletions
diff --git a/container-search/src/main/java/com/yahoo/search/grouping/request/ToDoubleFunction.java b/container-search/src/main/java/com/yahoo/search/grouping/request/ToDoubleFunction.java
index c6816dda621..8e7490d0cc6 100644
--- a/container-search/src/main/java/com/yahoo/search/grouping/request/ToDoubleFunction.java
+++ b/container-search/src/main/java/com/yahoo/search/grouping/request/ToDoubleFunction.java
@@ -8,6 +8,7 @@ import java.util.Arrays;
  * a double. If the argument can not be converted, this function returns 0.
  *
  * @author baldersheim
+ * @author bratseth
  */
 public class ToDoubleFunction extends FunctionNode {
 
@@ -17,6 +18,18 @@ public class ToDoubleFunction extends FunctionNode {
      * @param exp The expression to evaluate.
      */
     public ToDoubleFunction(GroupingExpression exp) {
-        super("todouble", Arrays.asList(exp));
+        this(null, null, exp);
     }
+
+    private ToDoubleFunction(String label, Integer level, GroupingExpression exp) {
+        super("todouble", label, level, Arrays.asList(exp));
+    }
+
+    @Override
+    public ToDoubleFunction copy() {
+        return new ToDoubleFunction(getLabel(), getLevelOrNull(), getArg(0).copy());
+    }
+
 }
+
+