nastra commented on code in PR #13216:
URL: https://github.com/apache/iceberg/pull/13216#discussion_r2126216911


##########
aws/src/integration/java/org/apache/iceberg/aws/s3/TestS3FileIO.java:
##########
@@ -623,6 +662,73 @@ public void testInputFileWithManifest() throws IOException 
{
     verify(s3mock, never()).headObject(any(HeadObjectRequest.class));
   }
 
+  @Test
+  public void resolvingFileIOLoadWithoutStorageCredentials()
+      throws IOException, ClassNotFoundException {
+    ResolvingFileIO resolvingFileIO = new ResolvingFileIO();
+    
resolvingFileIO.initialize(ImmutableMap.of(AwsClientProperties.CLIENT_REGION, 
"us-east-1"));
+
+    FileIO result =
+        DynMethods.builder("io")
+            .hiddenImpl(ResolvingFileIO.class, String.class)
+            .build(resolvingFileIO)
+            .invoke("s3://foo/bar");
+    assertThat(result)
+        .isInstanceOf(S3FileIO.class)
+        .asInstanceOf(InstanceOfAssertFactories.type(S3FileIO.class))
+        .satisfies(
+            fileIO -> {
+              assertThat(fileIO.client("s3://foo/bar"))
+                  .isSameAs(fileIO.client())
+                  .isInstanceOf(S3Client.class);
+              assertThat(fileIO.asyncClient("s3://foo/bar"))
+                  .isSameAs(fileIO.asyncClient())
+                  .isInstanceOf(S3AsyncClient.class);
+            });
+
+    // make sure credentials can be accessed after kryo serde
+    ResolvingFileIO resolvingIO = 
TestHelpers.KryoHelpers.roundTripSerialize(resolvingFileIO);

Review Comment:
   yes that might make sense. We do have the same issue across the codebase so 
I've opened https://github.com/apache/iceberg/issues/13237 to address this



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