Reading a Blob v2 table in a fresh process could return its storage
struct if neither `blob()` nor pylance had registered the extension.
Both local and remote schema reads were affected, so `field.type` could
depend on import order.
Restore metadata-only blob fields on every table schema read through the
existing BlobType resolver and Arrow's schema deserializer. Preserve
nested fields, nullability, custom metadata, and both supported storage
layouts. The fallback deserializer now honors the stored shape too.
Fresh-process regressions cover local and remote tables, sync/async
reads, and operation with and without pylance. The four native cases
failed before removing the native-table guard. Existing merge-insert
tests now require the restored extension type while continuing to verify
updated and inserted blob contents.
Validation:
- All 12 fresh-process local/remote schema regression cases pass.
- `uv run --extra tests pytest python/tests/test_table.py
python/tests/test_blob.py python/tests/test_namespace.py
python/tests/test_util.py -q -m 'not slow and not s3_test'`: 835 passed,
11 skipped.
- Python package Ruff lint and formatting checks pass.
- Repository-wide `ruff check .` reports 48 pre-existing diagnostics in
unchanged `docs/web-tests` files.
Fixes#4719
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Co-authored-by: Gatefixer <313497061+lancedb-gatefixer[bot]@users.noreply.github.com>
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