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docs(changelog): list the query completeness fields in 0.2.0 (Arc#726) #34

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xe-nvdk merged 1 commit into from
Nov 5, 2026
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docs(changelog): list the query completeness fields in 0.2.0 (Arc#726) #34

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8 changes: 8 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -28,6 +28,14 @@ plus bug fixes and the first real HTTP-layer test coverage.
- `tag_columns=` on `write_columnar`/`write_dataframe` and buffered writes,
sent as msgpack `tag_keys`.
- **Query path.**
- Result completeness (Arc#726): `QueryResponse.truncated` and
`truncation_reason` say Arc's stream failed part way, so `data` is missing
rows and must not be treated as the full result. `query()` returns them
rather than raising, so check `truncated` before using `data`.
`rows_capped` and `row_cap` say a governance row cap stopped the query:
the result is valid up to the cap. On Arrow, a truncated stream raises
`ArcQueryError` and the cap is in the schema metadata (`arc.rows_capped`,
`arc.row_cap`); on MessagePack, an incomplete body raises `ArcQueryError`.
- `profile=True` on `query`/`query_msgpack`, returned as `QueryResponse.profile`.
- `dictionary=`/`compression=` Arrow wire options.
- `QueryResponse.query_id`, and `arc.query_id` in the Arrow schema metadata,
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