From 9e73d440a36986db57f16cf8a19cf850135c53f2 Mon Sep 17 00:00:00 2001 From: "lancedb-gatefixer[bot]" <313497061+lancedb-gatefixer[bot]@users.noreply.github.com> Date: Thu, 6 Aug 2026 16:39:26 +0800 Subject: [PATCH] test(python): cover schema-only vector table creation (#3882) ## Summary - make the existing #1968 regression explicitly assert that schema-only table creation succeeds - verify the new table has zero rows and preserves the requested fixed-size vector schema before accepting subsequent data ## Root cause In v0.16.0, schema-only table creation sent an empty table through vector sanitization, which calculated a remainder using `len(data)` and raised `ZeroDivisionError`. Later refactors removed that runtime path, but the issue-specific regression only asserted the final row count after a subsequent add. This change makes the reported operation and its expected empty-table state explicit so the original defect remains directly covered. ## Validation - `uv run --extra tests pytest python/tests/test_table.py::test_create_table_without_data_with_vector_schema -q` - `uv --project python run --extra tests --extra dev ruff format --check python/python/tests/test_table.py` - `uv --project python run --extra tests --extra dev ruff check .` - `git diff --check` Fixes #1968 Co-authored-by: Gatefixer <313497061+lancedb-gatefixer[bot]@users.noreply.github.com> --- python/python/tests/test_table.py | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/python/python/tests/test_table.py b/python/python/tests/test_table.py index 069527b21..1f2e14742 100644 --- a/python/python/tests/test_table.py +++ b/python/python/tests/test_table.py @@ -3489,8 +3489,8 @@ def test_create_table_empty_list_no_schema_error(mem_db: DBConnection): mem_db.create_table("test_empty_no_schema", data=[]) -def test_add_table_with_empty_embeddings(tmp_path): - """Test exact scenario from issue #1968 +def test_create_table_without_data_with_vector_schema(tmp_path): + """Test exact scenario from issue #1968. Regression test for issue #1968: https://github.com/lancedb/lancedb/issues/1968 @@ -3502,6 +3502,9 @@ def test_add_table_with_empty_embeddings(tmp_path): embedding: Vector(16) table = db.create_table("test", schema=MySchema) + assert table.count_rows() == 0 + assert table.schema == MySchema.to_arrow_schema() + table.add( [{"text": "bar", "embedding": [0.1] * 16}], on_bad_vectors="drop",