1 files changed, 14 insertions, 1 deletions
diff --git a/container-search/src/main/java/com/yahoo/search/grouping/request/DayOfWeekFunction.java b/container-search/src/main/java/com/yahoo/search/grouping/request/DayOfWeekFunction.java
index f2135427bf5..6730db2e8d6 100644
--- a/container-search/src/main/java/com/yahoo/search/grouping/request/DayOfWeekFunction.java
+++ b/container-search/src/main/java/com/yahoo/search/grouping/request/DayOfWeekFunction.java
@@ -8,6 +8,7 @@ import java.util.Arrays;
  * equals the day of week (0 - 6) of the result of the argument, Monday being 0.
  *
  * @author Simon Thoresen Hult
+ * @author bratseth
  */
 public class DayOfWeekFunction extends FunctionNode {
 
@@ -17,6 +18,18 @@ public class DayOfWeekFunction extends FunctionNode {
      * @param exp The expression to evaluate, must evaluate to a long.
      */
     public DayOfWeekFunction(GroupingExpression exp) {
-        super("time.dayofweek", Arrays.asList(exp));
+        this(null, null, exp);
     }
+
+    private DayOfWeekFunction(String label, Integer level, GroupingExpression exp) {
+        super("time.dayofweek", label, level, Arrays.asList(exp));
+    }
+
+    @Override
+    public DayOfWeekFunction copy() {
+        return new DayOfWeekFunction(getLabel(),
+                                      getLevelOrNull(),
+                                      getArg(0).copy());
+    }
+
 }