rdblue commented on code in PR #12596:
URL: https://github.com/apache/iceberg/pull/12596#discussion_r2008116032


##########
core/src/main/java/org/apache/iceberg/MetadataColumns.java:
##########
@@ -93,21 +93,34 @@ private MetadataColumns() {}
           "_commit_snapshot_id",
           Types.LongType.get(),
           "Commit snapshot ID");
+  public static final NestedField ROW_ID =
+      NestedField.optional(
+          Integer.MAX_VALUE - 107, "_row_id", Types.LongType.get(), "Row ID 
for row lineage");
+  public static final NestedField LAST_UPDATED_SEQUENCE_NUMBER =
+      NestedField.optional(
+          Integer.MAX_VALUE - 108,
+          "_last_updated_sequence_number",
+          Types.LongType.get(),
+          "Last updated sequence number for row lineage");

Review Comment:
   "Sequence number when the row was last updated"? I don't know that we want 
to call out "row lineage" because people that see this may not know what that 
is.



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