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## Summary Regression test for [issue #2654](https://github.com/lancedb/lancedb/issues/2654) — a nullable struct column whose first batch contains only `None` values crashed in `_align_field_types` with `AttributeError: 'pyarrow.lib.DataType' object has no attribute 'fields'`. The actual fix landed in #3394, but no test was added. This PR adds the reproducer from the issue as a test. ## Test plan - `test_add_nullable_struct_with_none`: creates a table with a nullable struct column, adds a row with a non-null struct value, then a row with `None` for the struct field. Verifies both rows land correctly. - Uses Lance file format v2.1 (`new_table_data_storage_version="2.1"`) because nullable structs aren't supported on v2.0. ## Related - #3028 (the original fix attempt, now superseded)
LanceDB Python SDK
A Python library for LanceDB.
Installation
pip install lancedb
Preview Releases
Stable releases are created about every 2 weeks. For the latest features and bug fixes, you can install the preview release. These releases receive the same level of testing as stable releases, but are not guaranteed to be available for more than 6 months after they are released. Once your application is stable, we recommend switching to stable releases.
pip install --pre --extra-index-url https://pypi.fury.io/lancedb/ lancedb
Usage
Basic Example
import lancedb
db = lancedb.connect('<PATH_TO_LANCEDB_DATASET>')
table = db.open_table('my_table')
results = table.search([0.1, 0.3]).limit(20).to_list()
print(results)
Development
See CONTRIBUTING.md for information on how to contribute to LanceDB.