stevenzwu commented on code in PR #12100:
URL: https://github.com/apache/iceberg/pull/12100#discussion_r1929891571


##########
format/spec.md:
##########
@@ -337,8 +337,11 @@ The set of metadata columns is:
 | **`2147483546  file_path`**      | `string`      | Path of a file, used in 
position-based delete files                                                    |
 | **`2147483545  pos`**            | `long`        | Ordinal position of a 
row, used in position-based delete files                                        
 |
 | **`2147483544  row`**            | `struct<...>` | Deleted row values, used 
in position-based delete files                                                |
-| **`2147483543  _row_id`**        | `long`        | A unique long assigned 
when row-lineage is enabled, see [Row Lineage](#row-lineage)                    
|
-| **`2147483542  _last_updated_sequence_number`**   | `long`        | The 
sequence number which last updated this row when row-lineage is enabled [Row 
Lineage](#row-lineage) |
+| **`2147483543  _change_type`**                    | `string`      | Used in 
Changelog: The change type for this particular row:  INSERT, DELETE, 
UPDATE_BEFORE, or UPDATE_AFTER |

Review Comment:
   +1 for the rewording and removal of `Used in changelog` to be consistent 
with other descriptions in the same table.



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