rdblue commented on code in PR #6090:
URL: https://github.com/apache/iceberg/pull/6090#discussion_r1053474166


##########
core/src/main/java/org/apache/iceberg/FileCleanupStrategy.java:
##########
@@ -83,4 +85,25 @@ protected void deleteFiles(Set<String> pathsToDelete, String 
fileType) {
             (file, thrown) -> LOG.warn("Delete failed for {} file: {}", 
fileType, file, thrown))
         .run(deleteFunc::accept);
   }
+
+  protected Set<String> expiredStatisticsFilesLocations(
+      TableMetadata beforeExpiration, TableMetadata afterExpiration) {
+    Set<String> statisticsFilesLocationBeforeExpiry = 
allStatisticsFilesLocation(beforeExpiration);
+    Set<String> statisticsFilesLocationAfterExpiry = 
allStatisticsFilesLocation(afterExpiration);
+    
statisticsFilesLocationBeforeExpiry.removeAll(statisticsFilesLocationAfterExpiry);
+    return statisticsFilesLocationBeforeExpiry;

Review Comment:
   I think it is a best practice to avoid mutating sets or returning mutable 
sets. Can you use Guava's `Sets.difference` instead of `removeAll`? It would 
also be better if the set returned by `allStatisticsFilesLocations` were 
immutable.



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