Skip return type info if default

1 files changed, 1 insertions, 0 deletions

diff --git a/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/SerializationContext.java b/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/SerializationContext.java
index 94d663b4954..0b68e71c21a 100644
--- a/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/SerializationContext.java
+++ b/searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/SerializationContext.java
@@ -89,6 +89,7 @@ public class SerializationContext extends FunctionReferenceContext {
 
     /** Adds the serialization of the return type of a function */
     public void addFunctionTypeSerialization(String functionName, TensorType type) {
+        if (type.rank() == 0) return; // no explicit type implies scalar (aka rank 0 tensor)
         serializedFunctions.put("rankingExpression(" + functionName + ").type", type.toString());
     }