danielcweeks commented on code in PR #12582:
URL: https://github.com/apache/iceberg/pull/12582#discussion_r2012401126


##########
aws/src/main/java/org/apache/iceberg/aws/RESTSigV4AuthManager.java:
##########
@@ -61,20 +61,29 @@ public RESTSigV4AuthSession catalogSession(
   }
 
   @Override
-  public AuthSession contextualSession(SessionCatalog.SessionContext context, 
AuthSession parent) {
+  public RESTSigV4AuthSession contextualSession(
+      SessionCatalog.SessionContext context, AuthSession parent) {
     AwsProperties contextProperties =
-        new AwsProperties(RESTUtil.merge(catalogProperties, 
context.properties()));
+        new AwsProperties(
+            RESTUtil.merge(
+                catalogProperties,
+                // Use both context properties and credentials to create the 
AwsProperties instance
+                RESTUtil.merge(
+                    
Optional.ofNullable(context.properties()).orElseGet(Map::of),
+                    
Optional.ofNullable(context.credentials()).orElseGet(Map::of))));
+    RESTSigV4AuthSession sigV4Parent = (RESTSigV4AuthSession) parent;

Review Comment:
   If we're going to be hard-casting, we should probably include a precondition 
check to verify we're the right session type.



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