jackye1995 commented on a change in pull request #3425:
URL: https://github.com/apache/iceberg/pull/3425#discussion_r755721429
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File path: site/docs/spec.md
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@@ -581,10 +596,11 @@ Table metadata consists of the following fields:
| _optional_ | _optional_ | **`metadata-log`**| A list (optional) of timestamp
and metadata file location pairs that encodes changes to the previous metadata
files for the table. Each time a new metadata file is created, a new entry of
the previous metadata file location should be added to the list. Tables can be
configured to remove oldest metadata log entries and keep a fixed-size log of
the most recent entries after a commit. |
| _optional_ | _required_ | **`sort-orders`**| A list of sort orders, stored
as full sort order objects. |
| _optional_ | _required_ | **`default-sort-order-id`**| Default sort order id
of the table. Note that this could be used by writers, but is not used when
reading because reads use the specs stored in manifest files. |
+| | _optional_ | **`refs`** | A list of snapshot references, stored
as full snapshot reference objects. |
+| | _optional_ | **`current-branch`** | The name of the current
branch. If not specified, it defaults to the `main` branch that starts with the
table creation commit. |
Review comment:
the `refs` always record the latest snapshot ID of a branch, query of
branch and tag will use that information.
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