rdblue commented on code in PR #16689:
URL: https://github.com/apache/iceberg/pull/16689#discussion_r3375988595


##########
core/src/main/java/org/apache/iceberg/TrackingBuilder.java:
##########
@@ -143,6 +145,17 @@ Tracking build() {
         replacedPositions);
   }
 
+  /**
+   * Promotes an EXISTING entry to MODIFIED on mutation. Fresh-add builders 
(status = ADDED) are
+   * preserved — covers the same-commit append + DV attach case without a 
special branch.
+   */
+  private void promoteToModified() {
+    if (status == EntryStatus.EXISTING) {
+      this.status = EntryStatus.MODIFIED;
+      this.snapshotId = newSnapshotId;

Review Comment:
   Why is this setting the snapshot ID of a MODIFIED entry? The modification 
should set a specific snapshot ID, like the `dvSnapshotId`. We don't set the 
entry's snapshot ID when it is changed because we still want to know when the 
base file itself was added.



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