Cause (Documented platform behavior): Previously 0 silently fell back to the constructor window_size; now it is rejected.
Fix status: documented_behavior
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/deepset-ai/haystack/8a5406eea71a0fc19e94c4b9a5cd96df2158a45a/releasenotes/notes/fix-sentence-window-runtime-window-size-zero-774d768cefcde325.yaml (release_notes, unknown, documented_behavior): Upgrade note: window_size=0 at runtime now ValueError; omit or pass None.
- https://raw.githubusercontent.com/deepset-ai/haystack/8a5406eea71a0fc19e94c4b9a5cd96df2158a45a/haystack/components/retrievers/sentence_window_retriever.py (official_docs, unknown, documented_behavior): Source raises the ValueError.
Search phrasings: haystack window_size parameter must be greater than 0; SentenceWindowRetriever window_size 0 error
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Pipeline passing window_size=0 at runtime (directly or from an upstream component) raises ValueError.
- Context
- Product: Haystack Component: SentenceWindowRetriever Operation: run / run_async with window_size=0 Affected versions: unknown Environment: unknown Exception: ValueError Packages: haystack-ai recent 2.x/3.x (see reno note) Trigger: Relying on 0 meaning "use constructor value".
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- The window_size parameter must be greater than 0.
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [Haystack] SentenceWindowRetriever.run(window_size=0) now raises "The window_size parameter must be greater than 0."
Recommended action: Omit window_size (or pass None) at runtime to use the constructor value.
Option: Pass None instead of 0 [evidence: official_recommended_action]
Applies when: Runtime window_size
Steps:
1. retriever.run(retrieved_documents=..., window_size=None)
Expected: Constructor window_size used
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 1cbf7d64-d794-4dc9-8b8b-81946a782d71
- Proposed action
- Recommended action: Omit window_size (or pass None) at runtime to use the constructor value. Option: Pass None instead of 0 [evidence: official_recommended_action] Applies when: Runtime window_size Steps: 1. retriever.run(retrieved_documents=..., window_size=None) Expected: Constructor window_size used
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.