[AdaWorldAPI]

Why

We were about to re-invent vector-execution mechanisms that DuckDB already documents and that Quack already audited in September. The missing job is narrower: harvest only useful implementation techniques against the now-existing DR global→local sealed index and D-DRF landing-zone economics, without creating a second executor or violating the zero-copy fold rule.

The existing DuckDB→V3 matrix and lane-fold integration are authoritative. Lane-fold item 8 explicitly has no timed DuckDB column yet. The existing D-DRF-P2 benchmark establishes warm build vs direct vs amortized cached fold, while #1774 corrects the original cache-line/page attribution.

What this PR changes

• NEW DuckDB ↔ DR/Quack machine-room reuse plan.
• INDEX a concise status entry in .claude/board/INTEGRATION_PLANS.md.
• Source-pinned upstream DuckDB entrypoints: SelectionVector, Vector::Slice/SelCache, ToUnifiedFormat, scalar specializations and conjunction selection loops (read-only; snapshot 1641475ef1db08ec063631ff6a8f08d9d6736ae7).
• Separate resident DR mask, sealed u16 pointer map, borrowed SoA and optional derived facet cache; don't call the latter zero-copy.
• Four separately gated next steps: M1 timed existing DuckDB differential, M2 MAP/BORROW/GATHER break-even with cache-line/page controls, M3 one evidence-selected optimization, M4 KEEP/ADAPT/REJECT decision.
• Pre-registered semantics, accounting and falsifiers: SQL K3, Bag/Distinct, generation/scope/index-seal, same work, cache/churn, no pair tuple objects, zero hot-path allocation.

Existing measurement, NOT reproduced here

At 4,096 slots over 65,536 rows, random map, full mask, warm: P2 reported direct 20,982 ns, focus build 23,256 ns, cached fold 670 ns, crossover 2 folds. These are host/fixture-bound; TLB attribution is not established, and no huge-page control is claimed.

Invariants

• Quack lowers, mask-risc executes, ndarray provides compile-time peer SIMD backends.
• Do not recreate DuckDB's SelectionVector as a second per-query index; DR's versioned pointer map is the one admitted global→local index.
• Source and scope witnesses checked at binding/lease; derived value-cache materialization is explicit and disposable; MAP-only paths must not fetch values.
• No DataFusion migration, new executor, P64/cognitive shader wiring, tuple decoding, duplicate relational identity, or runtime ISA dispatch.

Checks

• Current repository sources and DuckDB entrypoints inspected.
• Compared branch against main: only the plan and integration index change.
• No Rust build or benchmark run (documentation-only PR; M1–M4 NOT RUN/NOT APPROVED).
• No generated entry index change (no new .claude/board/entries/ item).

Decision requested: review this audit and select the first tiny follow-up PR (M1 timed differential) rather than opening a broad refactor.

[coderabbitai]

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[chatgpt-codex-connector]

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Review	Status	Commit	Review trigger
📝 Code Review	🔄 Running since 2026-10-26T02:45:21.025882Z	ebe057f	Draft marked ready

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