flyrain commented on code in PR #4945:
URL: https://github.com/apache/iceberg/pull/4945#discussion_r904352829
##########
format/spec.md:
##########
@@ -631,6 +632,29 @@ When expiring snapshots, retention policies in table and
snapshot references are
2. The snapshot is not one of the first `min-snapshots-to-keep` in the
branch (including the branch's referenced snapshot)
5. Expire any snapshot not in the set of snapshots to retain.
+#### Statistics file
+
+Statistics files are valid [Puffin files](../puffin-spec). Statistics are
informational. A reader can choose to
+ignore statistics information. Statistics support is not required to read the
table correctly.
+
+Statistics files' metadata within `statistics` table snapshot field is a
struct with the following fields:
+
+| v1 | v2 | Field name | Type
| Description
|
+|------------|------------|---------------------------------|-----------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------|
+| _required_ | _required_ | **`statistics-path`** | `string`
| Path of the statistics file. See [Puffin file
format](../puffin-spec).
|
+| _required_ | _required_ | **`file-size-in-bytes`** | `long`
| Size of the statistics file.
|
+| _required_ | _required_ | **`file-footer-size-in-bytes`** | `long`
| Total size of the statistics file's footer (not the footer
payload size). See [Puffin file format](../puffin-spec) for footer definition. |
+| _required_ | _required_ | **`source-snapshot-id`** | `long`
| Table sequence number at which the stats were calculated
|
Review Comment:
Kind of confused by the field name and description. Is it a snapshot id or
sequence number? I assume it is a snapshot id.
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