HonahX commented on code in PR #11660:
URL: https://github.com/apache/iceberg/pull/11660#discussion_r1924290468
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format/spec.md:
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@@ -1633,3 +1633,47 @@ might indicate different snapshot IDs for a specific
timestamp. The discrepancie
When processing point in time queries implementations should use
"snapshot-log" metadata to lookup the table state at the given point in time.
This ensures time-travel queries reflect the state of the table at the provided
timestamp. For example a SQL query like `SELECT * FROM prod.db.table TIMESTAMP
AS OF '1986-10-26 01:21:00Z';` would find the snapshot of the Iceberg table
just prior to '1986-10-26 01:21:00 UTC' in the snapshot logs and use the
metadata from that snapshot to perform the scan of the table. If no snapshot
exists prior to the timestamp given or "snapshot-log" is not populated (it is
an optional field), then systems should raise an informative error message
about the missing metadata.
+### Optional Snapshot Summary Fields
+
+Snapshot summary can include metrics fields to track numeric stats of the
snapshot (see [Metrics](#metrics)) and operational details (see [Other
Fields](#other-fields)). The value of these fields should be of string type
(e.g., `"120"`).
+
+#### Metrics
+
+| Field | Description
|
+|-------------------------------------|--------------------------------------------------------------------------------------------------|
+| **`added-data-files`** | Number of data files added in the
snapshot |
+| **`deleted-data-files`** | Number of data files deleted in the
snapshot |
+| **`total-data-files`** | Total number of live data files in the
snapshot |
+| **`added-delete-files`** | Number of positional/equality delete
files and deletion vectors added in the snapshot |
+| **`added-equality-delete-files`** | Number of equality delete files added
in the snapshot |
+| **`removed-equality-delete-files`** | Number of equality delete files
removed in the snapshot |
+| **`added-position-delete-files`** | Number of position delete files added
in the snapshot |
+| **`removed-position-delete-files`** | Number of position delete files
removed in the snapshot |
+| **`added-dvs`** | Number of deletion vectors added in
the snapshot |
+| **`removed-dvs`** | Number of deletion vectors removed in
the snapshot |
+| **`removed-delete-files`** | Number of positional/equality delete
files and deletion vectors removed in the snapshot |
+| **`total-delete-files`** | Total number of live
positional/equality delete files and deletion vectors in the snapshot |
+| **`added-records`** | Number of records added in the
snapshot |
+| **`deleted-records`** | Number of records deleted in the
snapshot |
+| **`total-records`** | Total number of records in the
snapshot |
+| **`added-files-size`** | The size of files added in the
snapshot |
+| **`removed-files-size`** | The size of files removed in the
snapshot |
+| **`total-files-size`** | Total size of live files in the
snapshot |
+| **`added-position-deletes`** | Number of position delete records
added in the snapshot |
+| **`removed-position-deletes`** | Number of position delete records
removed in the snapshot |
+| **`total-position-deletes`** | Total number of position delete
records in the snapshot |
+| **`added-equality-deletes`** | Number of equality delete records
added in the snapshot |
+| **`removed-equality-deletes`** | Number of equality delete records
removed in the snapshot |
+| **`total-equality-deletes`** | Total number of equality delete
records in the snapshot |
+| **`deleted-duplicate-files`** | Number of duplicate files deleted
(duplicates are files recorded more than once in the manifest) |
+| **`changed-partition-count`** | Number of partitions with files added
or removed in the snapshot |
+
+#### Other Fields
Review Comment:
I think we should skip it since `app-id` is an engine/service specific
detail. More discussions:
https://github.com/apache/iceberg/pull/11660#discussion_r1919172817
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