lancedb-gatefixer[bot] ac8b28c010 fix(python): support nullable pandas merge input (#3864) ...

## Summary

- add an end-to-end Python regression for pandas DataFrame inputs merged
into a table created from a Pydantic model
- verify reordered, nullable Arrow source fields can update and insert
into a non-nullable target schema when the values contain no nulls

## Root cause

Lance merge_insert previously compared source schema nullability with
the target, unlike add. The upstream fix now pinned by LanceDB ignores
declared nullability during schema compatibility and validates actual
null values at write time. LanceDB lacked regression coverage for the
full pandas-to-Pydantic path, so this test locks in the correct behavior
without falsifying the input schema nullability.

## Validation

- 5 focused merge-insert tests passed
- Ruff lint passed for the repository
- Ruff format check passed for the changed file
- git diff --check passed

Fixes #2366

<!-- lance-gatekeeper-fix:v1 agent=f897fccfa206620c8a2acdc3bcd1c21f
generation=1 -->

Co-authored-by: Gatefixer <313497061+lancedb-gatefixer[bot]@users.noreply.github.com>

2026-08-06 16:44:38 +08:00

..

lancedb

fix(python): instruct dimension probe for instructor embeddings (#3874)

2026-08-06 16:41:11 +08:00

tests

fix(python): support nullable pandas merge input (#3864)

2026-08-06 16:44:38 +08:00