RussellSpitzer commented on code in PR #11660:
URL: https://github.com/apache/iceberg/pull/11660#discussion_r1881105008
##########
format/spec.md:
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@@ -693,6 +686,64 @@ A snapshot's `first-row-id` is assigned to the table's
current `next-row-id` on
The snapshot's `first-row-id` is the starting `first_row_id` assigned to
manifests in the snapshot's manifest list.
+#### Snapshot Summary
+
+##### Required Field `operation`
+The snapshot summary's `operation` field is used by some operations, like
snapshot expiration, to skip processing certain snapshots. Possible `operation`
values are:
+
+* `append` -- Only data files were added and no files were removed.
+* `replace` -- Data and delete files were added and removed without changing
table data; i.e., compaction, changing the data file format, or relocating data
files.
+* `overwrite` -- Data and delete files were added and removed in a logical
overwrite operation.
+* `delete` -- Data files were removed and their contents logically deleted
and/or delete files were added to delete rows.
+
+##### Optional Metrics
+All metrics fields should have numeric string values (e.g., `"120"`).
+Some of them are also used to represent partition-level metrics, in [Optional
Partition-Level Summary](#optional-partition-level-summary).
+
+| Field | Description
| Used in Partition-Level Summary |
+|-------------------------------------|-------------------------------------------------------------------|---------------------------------|
+| **`added-data-files`** | Number of data files added in the
current snapshot | Yes |
+| **`deleted-data-files`** | Number of data files deleted in the
current snapshot | Yes |
+| **`total-data-files`** | Total number of data files in the
current snapshot | No |
Review Comment:
Total number of live data files?
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