amogh-jahagirdar commented on code in PR #18526:
URL: https://github.com/apache/iceberg/pull/18526#discussion_r4461805282


##########
format/spec.md:
##########
@@ -522,15 +522,17 @@ The set of metadata columns is:
 | **`2147483541  _commit_snapshot_id`**             | `long`        | The 
snapshot ID in which the change occurred                                        
                         |
 | **`2147483540  _row_id`**                         | `long`        | A unique 
long assigned for row lineage, see [Row Lineage](#row-lineage)                  
                |
 | **`2147483539  _last_updated_sequence_number`**   | `long`        | The 
sequence number which last updated this row, see [Row Lineage](#row-lineage)    
          |
+| **`2147483538  _last_updated_time`**              | `timestamptz` | The 
timestamp of the snapshot which last updated this row (v4 and later), see [Row 
Lineage](#row-lineage) |

Review Comment:
   Yeah big +1 to using timestamptz, I think we don't want any ambiguity in how 
to interpret the timezone across different clients



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