1 files changed, 2 insertions, 0 deletions
diff --git a/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/ExpressionFunction.java b/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/ExpressionFunction.java
index 674571ff73e..f2f8799b342 100755
--- a/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/ExpressionFunction.java
+++ b/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/ExpressionFunction.java
@@ -134,6 +134,8 @@ public class ExpressionFunction {
         for (int i = 0; i < arguments.size() && i < argumentValues.size(); ++i) {
             argumentBindings.put(arguments.get(i), argumentValues.get(i).toString(new StringBuilder(), context, path, null).toString());
         }
+        String symbol = toSymbol(argumentBindings);
+        System.out.println("Expanding function " + symbol);
         return new Instance(toSymbol(argumentBindings), body.getRoot().toString(new StringBuilder(), context.withBindings(argumentBindings), path, null).toString());
     }