Sandbox::https://github.com/traceloop/openllmetry/pull/4695

gauravkr2209 · 2026-11-05T08:23:14Z

Problem
The LanceDB instrumentation reads request data only from kwargs. LanceDB documents table.add(data), table.search(query) and table.delete(where) as positional calls. With positional arguments the span loses its data attributes (e.g. tbl.add(rows) produced a span with only db.system/db.operation, missing db.milvus.insert.data_count).

Fix
Bind the call's args and kwargs to the wrapped method's signature (inspect.signature(...).bind_partial), flatten any **kwargs, and fall back to kwargs if binding fails, so behaviour never gets worse. Only the attribute-reading path changes; the wrapped call itself is untouched.

Tests
Added tests/test_positional_args.py (3 tests, real local LanceDB in a tmp dir, no network). They fail on main and pass with this change. Full LanceDB suite with the fix: 6 passed. ruff check passes. Note: tests/test_query.py::test_lancedb_delete fails on pristine main only with the newest lancedb; with the repo-pinned lancedb 0.26.1 it passes — pre-existing, unrelated to this PR.

Before / after (reproduction with a real local LanceDB, tbl.add(ROWS) where ROWS has 2 rows):
Before: span attributes {'db.system': 'lancedb', 'db.operation': 'add'} — no data count.
After: same span plus 'db.milvus.insert.data_count': 2, identical to the keyword call tbl.add(data=ROWS). (The db.milvus.* / db.chroma.* attribute names are pre-existing semantic-convention reuse in this package, unchanged here.)

Summary by CodeRabbit

Bug Fixes
- LanceDB telemetry now records arguments supplied positionally for add, search, and delete operations, improving the details shown in their spans.

coderabbitai · 2026-11-05T08:23:31Z

No actionable comments were generated in the recent review.

Walkthrough

LanceDB instrumentation now resolves positional and keyword arguments before setting span attributes for add, search, and delete. Regression tests check the span attributes produced by positional calls.

Changes: LanceDB argument attributes

Layer / File(s)	Summary
Resolve arguments for span attributes `packages/opentelemetry-instrumentation-lancedb/opentelemetry/instrumentation/lancedb/utils.py`, `packages/opentelemetry-instrumentation-lancedb/opentelemetry/instrumentation/lancedb/wrapper.py`, `packages/opentelemetry-instrumentation-lancedb/tests/test_positional_args.py`	`get_call_arguments` binds supplied arguments to parameter names and falls back to the original keyword arguments if inspection or binding fails. `_wrap` passes the resolved arguments to the `add`, `search`, and `delete` attribute setters. Tests check span attributes for positional calls.

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Suggested reviewers: benedikt-wolf

Merge Risk: Minimal · up to 25797

No merge-blocking issue is identified; the change is mergeable after normal checks.

Pre-merge checks: 5

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Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title "fix(lancedb): capture span attributes for positionally-passed arguments" matches the main change. The PR adds a get_call_arguments helper in utils.py that binds positional and keyword argum…
Docstring Coverage		Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentat…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
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Explanation

The title "fix(lancedb): capture span attributes for positionally-passed arguments" matches the main change. The PR adds a get_call_arguments helper in utils.py that binds positional and keyword arguments to the wrapped method's signature. The wrapper.py setters for add, search, and delete now receive these resolved arguments, so spans capture attributes for positional calls such as table.add(data). Regression tests in test_positional_args.py cover this behavior. The title is concise, specific, and follows the conventional commit style.

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Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 3 functions across 3 files.

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`packages/opentelemetry-instrumentation-lancedb/opentelemetry/instrumentation/lancedb/utils.py`

`packages/opentelemetry-instrumentation-lancedb/tests/test_positional_args.py`

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CLAassistant · 2026-11-05T08:24:19Z

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Reviewing files that changed from the base of the PR and between `4a294cd` and `f57b6e8`.

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`packages/opentelemetry-instrumentation-lancedb/opentelemetry/instrumentation/lancedb/utils.py`

`packages/opentelemetry-instrumentation-lancedb/opentelemetry/instrumentation/lancedb/wrapper.py`

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Updated docstring to clarify argument binding behavior.

Update test documentation and add span retrieval function.

chrikrah

@gauravkr2209 From my perspective this can be merged. Positional calls now carry the same attributes as keyword calls, against a real local LanceDB:

# PYTHONPATH=<git archive>/packages/opentelemetry-instrumentation-lancedb, Python 3.12, lancedb 0.26.1; base e3d651a, head 2579743
# span attributes besides db.system and db.operation, InMemorySpanExporter
call                       base                               head
tbl.add(rows)              {}                                 {'db.milvus.insert.data_count': 2}
tbl.search([1.0, 0.0])     {}                                 {'db.milvus.search.filter': '[1.0, 0.0]'}
tbl.delete("id = 1")       {}                                 {'db.chroma.delete.where': 'id = 1'}
tbl.search(np.array(...))  {}                                 {}
$ pytest tests -q
  (base) 3 passed   (head) 6 passed   (head, utils.py and wrapper.py from e3d651a) 3 failed, 3 passed
# numpy 2.5.4, encoder alone
len(str(np.random.rand(1536)))                     71     (elided with '...')
len(str(q.tolist())) for the same size             31147

non-blocking: the numpy row stays empty with query= too, because _encode_query runs if _query: and the array raises inside dont_throw. A bare is not None guard would record it, but str() elides a 1536-dim array to 71 characters. I'd guard with is not None and encode _query.tolist() when it has one, which matches the list row. Want that here, or in a follow-up from me?

gauravkr2209 · 2026-11-10T05:55:18Z

Thanks for the review and for verifying against a real LanceDB, @chrikrah. I would keep this PR scoped to positional arguments so your approval stays valid, and handle the numpy case separately. I am happy to open that follow-up myself using your suggestion (an is not None guard and encoding _query.tolist()), unless you prefer to do it. Could a maintainer also approve the pending workflow run so CI can start?

gauravkr2209 added 2 commits November 5, 2026 13:51

fix(lancedb): capture span attributes for positionally-passed arguments

e34c229

fix(lancedb): capture span attributes for positionally-passed arguments

f57b6e8

coderabbitai Bot reviewed Nov 5, 2026

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gauravkr2209 added 3 commits November 9, 2026 12:29

Merge branch 'main' into fix/lancedb-positional-args

dbe0ae1

docs(lancedb): expand get_call_arguments docstring

f1ae301

Updated docstring to clarify argument binding behavior.

docs(lancedb): add _span helper docstring in positional args tests

2579743

Update test documentation and add span retrieval function.

chrikrah approved these changes Nov 9, 2026

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fix(lancedb): capture span attributes for positionally-passed arguments - #4695

fix(lancedb): capture span attributes for positionally-passed arguments#4695
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