kbendick commented on code in PR #4716:
URL: https://github.com/apache/iceberg/pull/4716#discussion_r876207127


##########
core/src/main/java/org/apache/iceberg/MetadataUpdateParser.java:
##########
@@ -271,5 +378,51 @@ private static MetadataUpdate readAddSortOrder(JsonNode 
node) {
     UnboundSortOrder sortOrder = SortOrderParser.fromJson(sortOrderNode);
     return new MetadataUpdate.AddSortOrder(sortOrder);
   }
+
+  private static MetadataUpdate readSetDefaultSortOrder(JsonNode node) {
+    int sortOrderId = JsonUtil.getInt(SORT_ORDER_ID, node);
+    return new MetadataUpdate.SetDefaultSortOrder(sortOrderId);
+  }
+
+  private static MetadataUpdate readAddSnapshot(JsonNode node) {
+    Snapshot snapshot = SnapshotParser.fromJson(null, node);
+    return new MetadataUpdate.AddSnapshot(snapshot);
+  }
+
+  private static MetadataUpdate readRemoveSnapshots(JsonNode node) {
+    Set<Long> snapshotIds = JsonUtil.getLongSetOrNull(SNAPSHOT_IDS, node);

Review Comment:
   You're correct. This should never be null (as evidence by the null check 
below).
   
   I added the `getLongSetOrNull` function essentially because it mirrored the 
`getIntegerSetOrNull` function and still needed a preconditions check here for 
the size (given we don't currently support multiple values).
   
   I can update to `getLongSet` given it's added in this PR, but the 
Precondition check will still be needed.



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