RussellSpitzer commented on code in PR #14108:
URL: https://github.com/apache/iceberg/pull/14108#discussion_r2360602716


##########
spark/v4.0/spark/src/test/java/org/apache/iceberg/spark/actions/TestRewriteDataFilesAction.java:
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@@ -2645,4 +2645,50 @@ public boolean matches(RewriteFileGroup argument) {
       return groupIDs.contains(argument.info().globalIndex());
     }
   }
+
+  @TestTemplate

Review Comment:
   Nit point; tests should go with the other tests, look like these just got 
put at the bottom of the file below some private helper methods.
   
   Larger question, I'm not sure we want to add this many tests that fully 
integration test the rewrite. These are already quite expensive so adding new 
ones is always an issue. 
   
   I think adding one is probably fine. Another thing to consider is maybe we 
should just have an explicit test for the UDF. I think we would be able to 
write a much faster test just trying to put every type through the UDF without 
doing the rewrite too.
   



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