davidradl commented on code in PR #26683:
URL: https://github.com/apache/flink/pull/26683#discussion_r2149650394


##########
flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/plan/nodes/exec/serde/CompiledPlanSerdeUtil.java:
##########
@@ -265,6 +277,47 @@ static <T> Optional<T> deserializeOptionalField(
         return Optional.empty();
     }
 
+    static <T> List<T> deserializeList(
+            ObjectNode objectNode,
+            String fieldName,
+            Class<? extends T> type,
+            ObjectCodec codec,
+            DeserializationContext ctx)
+            throws IOException {
+        return ctx.readValue(
+                traverse(objectNode.required(fieldName), codec),
+                ctx.getTypeFactory().constructCollectionType(List.class, 
type));
+    }
+
+    static <T> List<T> deserializeListOrEmpty(
+            ObjectNode objectNode,
+            String fieldName,
+            Class<? extends T> type,
+            ObjectCodec codec,
+            DeserializationContext ctx)
+            throws IOException {
+        if (objectNode.hasNonNull(fieldName)) {
+            return deserializeList(objectNode, fieldName, type, codec, ctx);
+        }
+        return List.of();
+    }
+
+    static <K, V> Map<K, V> deserializeMapOrEmpty(

Review Comment:
   I was curious do we need to do something about empty / null arrays, or is 
this handled already?  



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