1 files changed, 6 insertions, 0 deletions
diff --git a/indexinglanguage/src/main/java/com/yahoo/vespa/indexinglanguage/expressions/CatExpression.java b/indexinglanguage/src/main/java/com/yahoo/vespa/indexinglanguage/expressions/CatExpression.java
index 4c14c633fbf..564ab015e10 100644
--- a/indexinglanguage/src/main/java/com/yahoo/vespa/indexinglanguage/expressions/CatExpression.java
+++ b/indexinglanguage/src/main/java/com/yahoo/vespa/indexinglanguage/expressions/CatExpression.java
@@ -9,6 +9,7 @@ import com.yahoo.document.datatypes.Array;
 import com.yahoo.document.datatypes.FieldValue;
 import com.yahoo.document.datatypes.StringFieldValue;
 import com.yahoo.document.datatypes.WeightedSet;
+import com.yahoo.vespa.indexinglanguage.ExpressionConverter;
 
 import java.util.*;
 
@@ -26,6 +27,11 @@ public final class CatExpression extends ExpressionList<Expression> {
     }
 
     @Override
+    public CatExpression convertChildren(ExpressionConverter converter) {
+        return new CatExpression(convertChildList(converter));
+    }
+
+    @Override
     protected void doExecute(ExecutionContext context) {
         FieldValue input = context.getValue();
         DataType inputType = input != null ? input.getDataType() : null;