nevzheng opened a new pull request, #12080: URL: https://github.com/apache/gravitino/pull/12080
### What changes were proposed in this pull request? Define and document Lance compatibility for the five Gravitino V3-native type families. | Type family | Outcome | | --- | --- | | Nanosecond timestamps | Round-trip exact precision-9 timestamps. | | Variant | Reject before dataset mutation. | | Unknown/Null | Round-trip nullable Unknown through Arrow Null; reject unsupported non-null use. | | Geometry | Round-trip through GeoArrow WKB while preserving CRS. | | Geography | Round-trip through GeoArrow WKB while preserving CRS and edge-algorithm metadata. | ### Why are the changes needed? Lance and Arrow provide exact representations for four families. Variant has no lossless target and must fail without overwriting the existing dataset. Fix: #12064 Related: #12056 ### Does this PR introduce _any_ user-facing change? Yes. Timestamp, nullable Unknown, Geometry, and Geography gain exact mappings, while Variant fails before mutation. ### How was this patch tested? - Added native Lance schema round-trip coverage. - Verified rejected Variant overwrite leaves the original dataset and metadata intact. - Covered the Lance-specific module suites and native integration paths. - Updated `docs/lakehouse-generic-lance-table.md`. -- 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]
