slfan1989 opened a new pull request, #2463:
URL: https://github.com/apache/iceberg-rust/pull/2463
## Which issue does this PR close?
- Closes #2462.
## What changes are included in this PR?
This PR adds support for the `history` metadata table.
Main changes:
- Add `HistoryTable` under `crates/iceberg/src/inspect/`.
- Add `MetadataTableType::History`.
- Support parsing `"history"` as a metadata table type.
- Expose `table.inspect().history()`.
- Wire the history metadata table into the DataFusion metadata table
provider.
- Support querying the table through DataFusion using:
```sql
SELECT * FROM my_table$history;
```
The history metadata table exposes the following columns:
Column | Description
-- | --
made_current_at | Timestamp when the snapshot was made current
snapshot_id | Snapshot ID from the table snapshot log
parent_id | Parent snapshot ID, if available
is_current_ancestor | Whether the snapshot is an ancestor of the current
snapshot
## Are these changes tested?
Yes.
This PR adds and updates tests for:
- table.inspect().history().scan() schema and returned rows.
- MetadataTableType::try_from("history").
- DataFusion metadata table listing to include table$history.
- DataFusion SQL query support for SELECT * FROM table$history.
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