jackye1995 commented on a change in pull request #3425:
URL: https://github.com/apache/iceberg/pull/3425#discussion_r755730221
##########
File path: site/docs/spec.md
##########
@@ -548,6 +548,21 @@ Notes:
1. An alternative, *strict projection*, creates a partition predicate that
will match a file if all of the rows in the file must match the scan predicate.
These projections are used to calculate the residual predicates for each file
in a scan.
2. For example, if `file_a` has rows with `id` between 1 and 10 and a delete
file contains rows with `id` between 1 and 4, a scan for `id = 9` may ignore
the delete file because none of the deletes can match a row that will be
selected.
+#### Snapshot Reference
+
+Snapshot reference allows users to perform tagging and branching within an
Iceberg table. The detailed user experience is described in [Iceberg Tagging
and Branching](../snapshot-tag-branch).
+
+The snapshot reference object records all the user-defined information of a
snapshot including name, reference type and retention policy configurations.
+
+| v2 | Field name | Type | Description |
+| ---------- |------------------------------|-----------|-------------|
+| _required_ | **`snapshot-id`** | `long` | The ID of the
snapshot referenced |
+| _required_ | **`name`** | `string` | The name of the
reference |
+| _required_ | **`type`** | `string` | Type of the
reference, `tag` or `branch` |
+| _optional_ | **`min-snapshots-to-keep`** | `int` | For `branch` type
only, the minimum number of snapshots to keep in a branch |
+| _required_ | **`max-snapshot-age-ms`** | `long` | The duration before
a snapshot tagged or in a branch could be expired by any automatic snapshot
expiration process |
Review comment:
@nastra The issue with `The duration before a snapshot reference can be
expired by any automatic snapshot expiration process` is that it does not
express the fact that all snapshots in a branch would be affected by the
policy. But I agree the current wording is a bit convoluted, any suggestion
would be welcome.
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