Revert "Merge pull request #6582 from vespa-engine/revert-6557-revert-6553-revert-6512-henrhoi/object-structured-grouping"

This reverts commit 506ea9c1367748ddd4ff20203fc13211d635f5a6, reversing
changes made to 4f6b34dcf9ad904f0ddb89eb506f5920360d5344.

1 files changed, 12 insertions, 1 deletions

diff --git a/container-search/src/main/java/com/yahoo/search/grouping/request/ReverseFunction.java b/container-search/src/main/java/com/yahoo/search/grouping/request/ReverseFunction.java
index 8283806b5c1..8937018c28f 100644
--- a/container-search/src/main/java/com/yahoo/search/grouping/request/ReverseFunction.java
+++ b/container-search/src/main/java/com/yahoo/search/grouping/request/ReverseFunction.java
@@ -8,6 +8,7 @@ import java.util.Arrays;
  * result of the argument, sorted in descending order.
  *
  * @author baldersheim
+ * @author bratseth
  */
 public class ReverseFunction extends FunctionNode {
 
@@ -17,6 +18,16 @@ public class ReverseFunction extends FunctionNode {
      * @param exp The expression to evaluate, must evaluate to a list.
      */
     public ReverseFunction(GroupingExpression exp) {
-        super("reverse", Arrays.asList(exp));
+        this(null, null, exp);
     }
+
+    private ReverseFunction(String label, Integer level, GroupingExpression exp) {
+        super("reverse", label, level, Arrays.asList(exp));
+    }
+
+    @Override
+    public ReverseFunction copy() {
+        return new ReverseFunction(getLabel(), getLevelOrNull(), getArg(0).copy());
+    }
+
 }