elphastori commented on code in PR #13129:
URL: https://github.com/apache/iceberg/pull/13129#discussion_r2105893412


##########
core/src/main/java/org/apache/iceberg/rest/RESTSessionCatalog.java:
##########
@@ -565,13 +568,16 @@ public List<Namespace> listNamespaces(SessionContext 
context, Namespace namespac
     }
 
     ImmutableList.Builder<Namespace> namespaces = ImmutableList.builder();
-    String pageToken = "";
+    String pageToken = null;
     if (pageSize != null) {
       queryParams.put("pageSize", String.valueOf(pageSize));
     }
 
     do {
-      queryParams.put("pageToken", pageToken);
+      if (pageToken != null) {
+        queryParams.put("pageToken", pageToken);
+      }
+

Review Comment:
   `pageToken` needs to be set inside the loop because it must be updated with 
each request, unlike `pageSize`, which remains constant.
   
   Here’s an example sequence of requests from the unit tests:
   1. http://localhost:8181/v1/namespaces/default/tables?pageSize=10
   2. 
http://localhost:8181/v1/namespaces/default/tables?pageSize=10&pageToken=10
   3. 
http://localhost:8181/v1/namespaces/default/tables?pageSize=10&pageToken=20



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