rdblue commented on code in PR #18503:
URL: https://github.com/apache/iceberg/pull/18503#discussion_r4459478648


##########
format/spec.md:
##########
@@ -1107,11 +1107,13 @@ A snapshot consists of the following fields:
     | _required_ | **`sequence-number`**        | A monotonically increasing 
long that tracks the order of changes to a table |
     | _required_ | **`timestamp-ms`**           | A timestamp when the 
snapshot was created, used for garbage collection and table inspection |
     | _required_ | **`root-manifest`**          | The location of the root 
manifest for this snapshot |
+    | _required_ | **`root-manifest-size-in-bytes`** | Size of the root 
manifest file in bytes |

Review Comment:
   Sounds like adding this would only be an optimization. As @ggershinsky says 
(I think) if we are using this for integrity in the encryption scheme, it 
should come from key metadata.
   
   I'm neutral on adding this and it doesn't seem related to encryption. The 
name is also needlessly long. How about `root-size-in-bytes` instead? Can this 
be in a separate PR?



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