stevenzwu commented on code in PR #14234:
URL: https://github.com/apache/iceberg/pull/14234#discussion_r3126062888


##########
format/spec.md:
##########
@@ -683,6 +683,13 @@ Notes:
 5. The `content_offset` and `content_size_in_bytes` fields are used to 
reference a specific blob for direct access to a deletion vector. For deletion 
vectors, these values are required and must exactly match the `offset` and 
`length` stored in the Puffin footer for the deletion vector blob.
 6. The following field ids are reserved on `data_file`: 141.
 
+###### File-level column statistics

Review Comment:
   Do we need to update the fields table starting in line 646? add a new column 
for v4, add the `content_stats` struct field, mark the map stats fields as 
deprecated in v4?



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