RussellSpitzer commented on a change in pull request #1373:
URL: https://github.com/apache/iceberg/pull/1373#discussion_r476614552



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File path: core/src/main/java/org/apache/iceberg/TableMetadata.java
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@@ -598,20 +649,38 @@ public TableMetadata buildReplacement(Schema 
updatedSchema, PartitionSpec update
       builder.add(freshSpec);
     }
 
+    // determine the next order id
+    int maxOrderId = 
sortOrders.stream().mapToInt(SortOrder::orderId).max().orElse(INITIAL_SORT_ORDER_ID);
+    int nextOrderId = maxOrderId + 1;

Review comment:
       This block of changes 652 -668 Is confusing to me, could add some more 
comments? I'm mostly confused about when we add "freshSortOrder" , it looks 
like we ignore it entirely if an equivalent SortOrder is there?




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