W-D two-column GROUP BY + board status reconcile + collapse probe dispatch split - #1275
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Nine STATUS_BOARD rows still read "In PR" or "Queued" for work that has merged. Each flip was checked against origin/main before editing: - D-WFL-FUSE Shipped: single-op #1270, multi-op chains ≤3 planes #1272 - D-WFL-W2b‴ Shipped W2b-A #1268; W2b-B reuse burden stays OPEN - D-WFL-EXTENT Shipped #1269 (`execute_extent`) - D-WFL-T1-FUSED, T1-FUSED′ Shipped (ndarray #322 + #1270) - D-WFL-L0 Shipped #1251 - D-WFL-W2a Shipped #1268: un-gated Pred::Range, Count = hi−lo, Any = lo<hi, zero scratch (`run_fused`) - D-WFL-W2a′ Shipped #1268: `requires_scratch()` derived from the fused lowerings, never a caller flag - D-WFL-2 Partially shipped: range Count/Any landed as a lowering, the `BoundedMask` window is not built Status cells only; every row's description is unchanged, and the old status is kept after "was:" where it carried detail. The row count stays at 2203 lines. Also corrects one exec.rs comment that still described the Boolean fold as "a single 2/3-input op"; since #1272 it collapses whole chains. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GXUahz73MZxtxWcfpHp9dG
…h; v3 and v4 measured program_collapse_probe gains a fourth arm. BULK evaluates each op once over the whole touched span, into preallocated buffers, with the same ndarray::simd kernels the executor calls per tile. It writes the same derived words as the tiled path but makes one facade call per op, not one per op per tile. Two derived columns: wr_ns = bulk - fold (the writes) and disp_ns = tiled - bulk (per-tile overhead). Every arm is asserted equal to the bit-serial oracle. Measured at N = 1M, whole population: - disp_ns is 90-94 % of tiled_ns at both v3 and v4 (~30 ns per op per 8-word tile). The writes cost at most ~19 us. Most of #1272's 10-26x is skipping the tile interpreter; write elimination is the smaller share. - At v4 every collapsible 3-plane Count folds in ~6.2 us regardless of its truth table (v3: 8.6-17.3 us). The tiled path does not move between tiers. - At 1 % extents BULK beats the fold, which pays a fixed per-call cost (validate + re-running the symbolic recognizer). Entry: .claude/board/entries/2026-09-23-collapse-probe-v4-and-dispatch-split.md. Tile size is deliberately NOT changed; it is bound to the scratch-size contract, and the entry records it as OPEN. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GXUahz73MZxtxWcfpHp9dG
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Included review availability: 0 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 3 reviews per hour. 📝 WalkthroughWalkthroughThe changes add two-column composite-key grouping for four reductions, extend the collapse probe with whole-span BULK evaluation, and update status-board records for shipped and partially shipped work. The probe documentation now describes its timing values as path gaps rather than isolated costs. ChangesTwo-Column Grouping
Collapse Probe Measurement
Status Board Records
Estimated code review effort: 3 (Moderate) | ~25 minutes Sequence Diagram(s)sequenceDiagram
participant DifferentialTests
participant QuackLowering
participant MaskRiscExecutor
participant DuckDBOracle
DifferentialTests->>QuackLowering: Lower two-column grouped reduction
QuackLowering->>MaskRiscExecutor: Pass GroupKey::Pair
MaskRiscExecutor-->>DifferentialTests: Return grouped reduction result
DifferentialTests->>DuckDBOracle: Compare grouped result
DuckDBOracle-->>DifferentialTests: Return expected result
Merge Risk: ⚪ Minimal · up to No concrete merge-blocking issue is established by the supplied evidence. Complete the normal CI checks before merging. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
A rabbit checks each paired key, Comment |
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…ir (quack) Parity item W-D. A two-column `GROUP BY hi, lo` lowers to ONE Terminal::GroupReduce keyed by the composite `hi * stride + lo`, and delegates to ndarray #324's `masked_group_*_pair` kernels. No composite key lane is materialised anywhere. mask-risc - `GroupKey::Pair { hi, lo, stride }`. Both lanes are validated like `Lane` (U32, in range). Four GroupReduce arms: Count / MinI32 / MaxI32 / SumSymI32. Partial-extent refusal and sink seeding match on the TERMINAL, so Pair inherits both unchanged. - The scalar reference computes the composite independently (u64 widen; drop when `lo >= stride` or when the composite is past the universe). It never calls the kernel it checks. quack - `GroupAddr::Pair { hi, lo, stride }` lowers to `GroupKey::Pair`. - `lower_group_avg` refuses a Pair key with the new `LowerError::GroupAvgPairKey` (`LowerError` is already non_exhaustive): no full-range pair GROUP SUM terminal exists, so AVG would have only half its fraction. Tests - mask-risc `foreign.rs`: - Pair equals a precomputed composite Lane under the same executor, and equals `reference_execute`, for all four folds (n = 1000, i.e. more than one tile; >= 8 non-empty groups, counted independently). - A `lo == stride` row that would alias `(1, 0)`'s slot is dropped. - An existing exhaustive match gains an `unreachable!` arm for Pair. The loop there yields Lane/Via only, and Pair has no full-range sum to compare against. - quack DuckDB differential: three new cases, GROUP BY (cost_center, status), 24 groups via key = cost_center*3 + status: COUNT, MIN, and a sparse MAX with 15 NULL groups. Expected values were regenerated by `oracle.py` against DuckDB 1.5.5. The three ids were added to its GROUPED set; all 32 existing rows regenerated byte-identical. Depends on ndarray #324 (CI resolves ndarray via the local path dep). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GXUahz73MZxtxWcfpHp9dG
…upReduce Records the ndarray #324 + mask-risc + quack landing, the DuckDB gate, the disable runs (including the vacuous first ndarray stride test that was caught and rewritten), and the open items: AVG / full-range SUM over a Pair key, and more than two key columns. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GXUahz73MZxtxWcfpHp9dG
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CI clones ndarray There is no fix to port: this PR needs those kernels. Locally, against the #324 branch, A re-run will not change the result while #324 is unmerged, so none is spent now. Once #324 lands, I will re-run the red jobs on this head. Generated by Claude Code |
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September 23, 2026 20:24
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In @.claude/board/entries/2026-09-23-collapse-probe-v4-and-dispatch-split.md:
- Line 33: Update the per-operation, per-tile overhead estimate in the
tiled-path discussion using the v3 measurements: the cited rows imply about
42–51 ns, not 30 ns. Update its repeat in Line 39 as well, or state a range
across chains.
In `@crates/lance-graph-mask-risc/examples/program_collapse_probe.rs`:
- Around line 20-23: Update the timing column descriptions and board note in the
probe to report wr_ns and disp_ns as measured gaps between execution paths, not
isolated write or per-tile dispatch costs. Describe the 90–94% result as a path
gap; retain the first-order caveat and avoid attributing these differences to
specific costs without matched-work controls.
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.claude/board/STATUS_BOARD.md.claude/board/entries/2026-09-23-collapse-probe-v4-and-dispatch-split.md.claude/board/entries/2026-09-23-quack-w-d-multi-key-group-by.md.claude/board/entries/README.mdcrates/lance-graph-mask-risc/examples/program_collapse_probe.rscrates/lance-graph-mask-risc/src/exec.rscrates/lance-graph-mask-risc/src/ir.rscrates/lance-graph-mask-risc/src/reference.rscrates/lance-graph-mask-risc/tests/foreign.rscrates/lance-graph-quack/src/lib.rscrates/lance-graph-quack/tests/duckdb/oracle.pycrates/lance-graph-quack/tests/duckdb_differential.rs
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…figure to 33-54 ns Addresses two CodeRabbit findings on #1275, both verified against the data. - The "~30 ns per op per tile" figure was an arithmetic error. The v3/v4 whole-population rows give disp_ns / (ops x 2048 tiles) = 33-54 ns. The Readings line and the Open line now carry that range. - wr_ns and disp_ns were described as isolated costs (the writes; per-tile dispatch). They are gaps between execution paths: - bulk - fold also carries the pass-count/read difference (k passes vs one fused pass); - tiled - bulk also carries batch-size effects. The probe doc, its printed footer and the entry now say so, and add that isolating either cost would need matched-work controls. The entry title and the v4 reading no longer call the tiled path "dispatch-bound". No measurement changed; only what the numbers are claimed to isolate. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GXUahz73MZxtxWcfpHp9dG
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Contents
Board status reconcile (
02932503). NineD-WFL-*rows still read "In PR" or "Queued" for work already merged in plan: the Waben fold execution loop — four seams, and attestation that has an author #1251, mask-risc: the terminal elects materialization — fused Range ∩ plane → Count/Any #1268, mask-risc: absolute execution extent — execute_extent over [lo, hi) without rebasing #1269, mask-risc: Boolean membership (And/Or/Xor/AndNot/Ternlog) over resident planes → Count/Any with no mask written #1270, mask-risc: collapse ≤3-leaf Boolean op chains onto the ternlog Count/Any fold #1272 and ndarray feat(contract): promote EWA-Sandwich Σ-propagation kernel to lance-graph-contract (B1) #322. I checked each flip against main before making it, and only the status cells changed. One staleexec.rscomment is also corrected.Probe: a new BULK arm (
e56140c1). BULK does the same derived-word writes as the tiled path, but with one facade call per op instead of one per op per 8-word tile. Every arm is checked against the oracle. At N = 1M, on x86-64 at both v3 and v4:Tile size is not changed; it is recorded as OPEN.
W-D: two-column
GROUP BY(869ba24d, entry69b88b70).GroupKey::Pair { hi, lo, stride }, supported by Count / Min / Max / SumSymGroupReduce.GroupAddr::Pair.hi*stride + lo, and no key lane is ever materialised.LowerError::GroupAvgPairKey), because no full-range pair SUM terminal exists.Gates:
GROUP BY (cost_center, status)over 24 groups, including a sparse MAX with 15 NULL groups. Expected values were regenerated byoracle.pyon DuckDB 1.5.5; the 32 existing rows regenerated byte-identical.reference_execute, across more than one tile.hi/loswapped in the exec arm;stride + 1;One test fix: an existing exhaustive
matchinforeign.rsgains anunreachable!arm, since its loop only yieldsLane/Via.Gates run locally (debug=0)
cargo test -p lance-graph-mask-risc -p lance-graph-quack: all green.--all-targets -D warningsand fmt: clean.lance-graph-reportbuilds.Dependency
W-D uses the ndarray kernels from ndarray #324. This repo's CI resolves ndarray through the local path dep, so W-D is only green once #324 is merged.
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