amogh-jahagirdar commented on code in PR #13614:
URL: https://github.com/apache/iceberg/pull/13614#discussion_r2226802628


##########
core/src/main/java/org/apache/iceberg/RemoveSnapshots.java:
##########
@@ -390,4 +386,43 @@ private void cleanExpiredSnapshots() {
 
     cleanupStrategy.cleanFiles(base, current);
   }
+
+  private void validateCleanupCanBeIncremental(TableMetadata current) {
+    if (specifiedSnapshotId) {
+      throw new UnsupportedOperationException(
+          "Cannot clean files incrementally when snapshot IDs are specified");
+    }
+
+    if (current.refs().size() > 1) {
+      throw new UnsupportedOperationException(
+          "Cannot incrementally clean files for tables with more than 1 ref");
+    }
+
+    if (!allRemovedSnapshotsAreInMainAncestry(current)) {
+      throw new UnsupportedOperationException(
+          "Cannot incrementally clean files when snapshots outside of main 
ancestry have been removed");
+    }
+  }
+
+  private boolean allRemovedSnapshotsAreInMainAncestry(TableMetadata current) {
+    Set<Long> snapshotsBeforeExpiration =
+        
base.snapshots().stream().map(Snapshot::snapshotId).collect(Collectors.toSet());

Review Comment:
   Don't need the extra set here, can just iterate over it



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