1 files changed, 12 insertions, 1 deletions
diff --git a/container-search/src/main/java/com/yahoo/search/grouping/request/StrLenFunction.java b/container-search/src/main/java/com/yahoo/search/grouping/request/StrLenFunction.java
index e9ca48b3db3..d784e37b337 100644
--- a/container-search/src/main/java/com/yahoo/search/grouping/request/StrLenFunction.java
+++ b/container-search/src/main/java/com/yahoo/search/grouping/request/StrLenFunction.java
@@ -8,6 +8,7 @@ import java.util.Arrays;
  * number of bytes in the string result of the argument.
  *
  * @author Simon Thoresen Hult
+ * @author bratseth
  */
 public class StrLenFunction extends FunctionNode {
 
@@ -17,7 +18,17 @@ public class StrLenFunction extends FunctionNode {
      * @param exp The expression to evaluate, must evaluate to a string.
      */
     public StrLenFunction(GroupingExpression exp) {
-        super("strlen", Arrays.asList(exp));
+        this(null, null, exp);
     }
+
+    private StrLenFunction(String label, Integer level, GroupingExpression exp) {
+        super("strlen", label, level, Arrays.asList(exp));
+    }
+
+    @Override
+    public StrLenFunction copy() {
+        return new StrLenFunction(getLabel(), getLevelOrNull(), getArg(0).copy());
+    }
+
 }