rdblue commented on code in PR #4945:
URL: https://github.com/apache/iceberg/pull/4945#discussion_r895213345
##########
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:
+
+| v2 | Field name | Type
| Description
|
+|------------|---------------------------------|----------------------------------------|--------------------------------------------------------------------------------------------------------|
+| _required_ | **`statistics-path`** | `string`
| Path of the statistics file. See [Puffin file
format](../puffin-spec). |
+| _required_ | **`file-size-in-bytes`** | `long`
| Size of the statistics file.
|
+| _required_ | **`file-footer-size-in-bytes`** | `long`
| Size of the statistics file's footer. See [Puffin file
format](../puffin-spec) for footer definition. |
+| _required_ | **`source-sequence-number`** | `long`
| Table sequence number at which the stats were calculated
|
Review Comment:
Yes, I think this should have the snapshot for at which stats were
calculated.
There's also no reason to not support this in v1. As long as the snapshot ID
is here for tracking, it should work just fine.
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