ebyhr commented on code in PR #11041: URL: https://github.com/apache/iceberg/pull/11041#discussion_r2875572955
########## format/view-spec.md: ########## @@ -160,7 +178,120 @@ Each entry in `version-log` is a struct with the following fields: | _required_ | `timestamp-ms` | Timestamp when the view's `current-version-id` was updated (ms from epoch) | | _required_ | `version-id` | ID that `current-version-id` was set to | -## Appendix A: An Example +#### Storage Table Identifier + +The table identifier for the storage table that stores the precomputed results. + +| Requirement | Field name | Description | +|-------------|----------------|-------------| +| _required_ | `namespace` | A list of strings for namespace levels | +| _required_ | `name` | A string specifying the name of the table | + +### Storage table metadata + +This section describes additional metadata for the storage table that supplements the regular table metadata and is required for materialized views. +The property "refresh-state" is set on the [snapshot summary](https://iceberg.apache.org/spec/#snapshots) property of every storage table snapshot to determine the freshness of the precomputed data of the storage table. + +| Requirement | Field name | Description | +|-------------|-----------------|-------------| +| _required_ | `refresh-state` | A [refresh state](#refresh-state) record stored as a JSON-encoded string | + +#### Freshness + +A materialized view is "fresh" when the storage table adequately represents the logical query definition of the view. +Since different systems define freshness differently, it is left to the consumer to evaluate freshness based on its own policy. + +**Consumer behavior:** + +When evaluating freshness, consumers: +- May apply time-based freshness policies, such as allowing a staleness window based on `refresh-start-timestamp-ms`. Review Comment: We need an empty line after L206. <img width="849" height="199" alt="Image" src="https://github.com/user-attachments/assets/3ebee06d-37d6-4365-b941-ec08be0c70a7"; /> -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
