cypher-mask: a mask is the support of a frontier, never its bag (D-CMM-0..3) - #1305
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A mask is the support of a frontier, never its multiplicity. Pins the KNOWS 2-hop fixture (count(*)=4 vs count(DISTINCT c)=3) and states the Frontier/ConsumerSemantics/Unfold contract before any code. Claude-Session: https://claude.ai/code/session_01VSQE2ErQwkg1zbUir7TbeM
…M-0..3) 5+3 council on cypher-mask-lowering-v1's multiplicity rows, ratified v3. - LogicalOperator::consumer_semantics() classifies the carrier a RETURN consumer needs: TerminalSet / EarlierSet / TerminalCount / EarlierCount / Bindings. Not Serialize (guard test). Four disables red-then-green. - DataFusion bag pins: 2-hop count(*) 4 vs DISTINCT 3; *1..2 4 vs 3; on a cycle DataFusion counts walks (5), not Cypher trails (4) - recorded OPEN. - W0-b census consumes the classifier: Full 117 -> 70 of 310. - Plan rows T-1..T-7, T-11, R-6..R-8, section 4.1/4.6 and the wave oracles narrowed, not deleted. Board: D-CMM rows, entry, INTEGRATION_PLANS correction, AGENT_LOG. Claude-Session: https://claude.ai/code/session_01VSQE2ErQwkg1zbUir7TbeM
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Included review availability: This review used your included allowance. 4 included reviews remain after this review. Your included PR review attempts over the past 7 days set your current allowance at 5 reviews per hour. 📝 WalkthroughWalkthroughThis change distinguishes mask support from Cypher bag multiplicity. It adds a logical-plan consumer classifier, uses its results in the corpus census, updates lowering documentation, and adds DataFusion tests and a carrier-sufficiency tool to record path, endpoint, walk, and trail results. ChangesCypher Mask Multiplicity
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Merge Risk: ⚪ Minimal · up to The supplied changes establish no merge-blocking issue. Full bindings retain the edge identities needed for trail analysis; the existing WALK/TRAIL difference remains explicitly documented and outside this change’s scope. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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…e, not line Fixes the added-plans-have-dids and citation-decay checks on #1305. Claude-Session: https://claude.ai/code/session_01VSQE2ErQwkg1zbUir7TbeM
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Codex P2 on #1305: MATCH (a)->(b), (a)->(c) nests Expands whose outer source is not the inner target, and was classified as a linear two-hop TerminalSet. Claude-Session: https://claude.ai/code/session_01VSQE2ErQwkg1zbUir7TbeM
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Inline comments:
Review comments at @.claude/plans/cypher-mask-lowering-v1.md:
- Around line 389-393: Reconcile the “Nine rows” count in the multiplicity
qualifier sentence with its listed rows: either correct the count to match all
11 entries or clarify which subset the count refers to. Preserve the existing
row labels and qualifier distinctions.
- Around line 501-502: Clarify the §4.6 `count(DISTINCT)` support table so
unsupported multiplicity means binding, value, or path multiplicity, not
distinct terminal-node counting. Keep `count(DISTINCT c)` supported for terminal
nodes and make the unsupported case explicit alongside the `how many BINDINGS
(paths)?` row.
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.claude/board/AGENT_LOG.md.claude/board/INTEGRATION_PLANS.md.claude/board/STATUS_BOARD.md.claude/board/entries/2026-09-30-cypher-mask-is-support-not-bag.md.claude/board/entries/README.md.claude/plans/cypher-mask-lowering-v1.md.claude/plans/cypher-mask-multiplicity-contract-v1.mdcrates/lance-graph/examples/w0b_corpus_census.rscrates/lance-graph/src/logical_plan.rscrates/lance-graph/tests/test_datafusion_varlength_complex.rs
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CodeRabbit on #1305: the list named 11 rows; count(DISTINCT) in the multiplicity row now says value/binding/path, not terminal-node distinct. Claude-Session: https://claude.ai/code/session_01VSQE2ErQwkg1zbUir7TbeM
DataFusion, Ladybug (PathSemantic::WALK default, no r1<>r2 in
rewriteMatchPattern) and SQL joins all compute walk semantics, so v1
adopts WALK and TRAIL becomes a separate mode. D-CMM-5 is reclassified
from "DataFusion divergence" accordingly.
Strikes §0's "diverge only on cycles": a direction change reuses an edge
on an acyclic graph ((a)->(b)<-(c) on {1->2}: 1 walk, 0 trails).
Adds §7.3, a carrier-sufficiency table measured by exhaustive
enumeration over every 3-node multigraph with up to 4 edges
(.claude/tools/carrier_sufficiency.py, every "no" prints a witness):
node support answers only Exists/Support under WALK; per-node counts
add Count/CountBy; the last hop's edge population adds the previous
node; no per-node or per-edge carrier answers TRAIL two hops on.
§7.4 keeps the mask-RISC ScatterOrU32 survival rule and states the
exact condition under which a later PR may relax it.
Docs and board only; no code change.
Claude-Session: https://claude.ai/code/session_01VSQE2ErQwkg1zbUir7TbeM
Revises §11 the same day after reading #1305's committed work (support is not bag; forward chains give terminal support only; DataFusion counts walks; consumer_semantics() names five carrier kinds). - Stable socket: population, relation (a population with two index lanes, not a fourth primitive), step(observation) -> answer or Insufficient. mask-risc's MASK/TRANSPORT/REDUCE move below it as lowering vocabulary. - One directed hop is one existing mask-risc Program over the edge table; the five #1305 kinds map onto its five observations exactly at k = 1. - Frozen as law (spec only): carrier sufficiency; explicit walk/trail; zero is false only inside a declared (space, epoch) domain; rendering outside computation; replaceable backends. - Measured: mask-risc's zero fallback plus length-only foreign checks turn not-evaluated into false (ISS-MASK-RISC-ZERO-FALLBACK-IS-NOT-EVALUATED-FALSE). - ScatterOrU32 prohibition not relaxed; the condition for a future relaxation is recorded. CausalEdge64 stays above: a value lane, not a relation. - Next PR: quack observation types + the existing doc-line-partner DuckDB oracle. No code. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DCEP2fZdHYdMCtcEVcTpS2
#1305 closes unmerged. Kept: support-not-bag fixture (4 vs 3), terminal-only exactness of a forward chain, walks vs trails (5 vs 4; 1 vs 0 acyclic), three pattern-shape refusals, the census drop to 70/313, and the pre-hop caveat on v1's terminal rows. D-CML-2 no longer ports consumer_semantics(): per-path carriers are refused, not carried. Evidence stays on ccr-2fcc2bd3-8o7m2l@67abd29. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DCEP2fZdHYdMCtcEVcTpS2
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Closing without merging, by the operator's decision. The Cypher direction is now #1306 ( That plan is a fork-owned mask engine. It calls the upstream parser and planner read-only and makes no edits to upstream files, so Six measurements from this PR carry over into #1306, in
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… pipeline - A push hop answers only RETURN b; count/exists/sum/WHERE over it are R-CHAIN (count(DISTINCT) only via CountKeyRunsU32 on a key-ordered lane). - sum/avg after a hop refused (R-BAG); min/max stay (idempotent under repetition). - R-SHAPE: the three #1305 pattern-shape refusals get their own variant. - run's pipeline is explicit: parse -> label check (before planning, so R-UNBOUND-LABEL is reachable) -> semantic/plan (R-UNPLANNED) -> classify with binding + lane catalogue -> lower. - Answer is one item per RETURN item; any refused item refuses the query. - Relative-target hop partitions the source by each row's own offset; the all-zero (unbound) locus excluded. - Entry states 37.3 % as an upper bound beside #1305's 70/313. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DCEP2fZdHYdMCtcEVcTpS2
2 participants
This PR comes out of a 5+3 council on the multiplicity rows of
cypher-mask-lowering-v1. The ratified spec is.claude/plans/cypher-mask-multiplicity-contract-v1.md, amended by its §7 before merge.The defect
After a hop, the plan lowered
count(*)to the popcount of the final mask. Cypher counts one row per binding (path), not one per node. Measured on KNOWS = {1→2, 1→3, 2→3, 3→4, 4→5}:(a)->(b)->(c) RETURN count(*)count(DISTINCT c.id)*1..2from id 1,count(*)count(DISTINCT b)dst₁= 4The last row is a second defect: a forward hop chain gives the exact support of the terminal variable only.
Changes
LogicalOperator::consumer_semantics()classifies the carrier a RETURN consumer needs:TerminalSet,EarlierSet,TerminalCount,EarlierCountorBindings.Serialize, and a guard test with a can-fire arm enforces that.Joinlet through; the chain check removed; the per-hop rebind check removed; the scan-level rebind check removed.tests/test_datafusion_varlength_complex.rs: DAG 4 vs 3 (2-hop), 4 vs 3 (*1..2); on a cycle {1→2, 2→1, 2→2}, DataFusion returns 5 walks (the trail count is 4).PathSemantic::WALKdefault, nor1 <> r2for fixed-length patterns) and SQL joins all compute it. D-CMM-5 is reclassified accordingly; TRAIL is a separate mode.(a)->(b)<-(c)on the single edge {1→2} is 1 as a walk and 0 as a trail.python3 .claude/tools/carrier_sufficiency.py; every "no" prints its witness). Node support answers only Exists/Support under WALK; per-node counts add Count/CountBy; the last hop's edge population adds the previous node; no per-node or per-edge carrier answers a TRAIL question two hops on.ScatterOrU32survival rule stays; §7.4 states the exact condition under which a later PR may relax it.Gates
All cargo gates ran with debug info off:
cargo test -p lance-graph --lib logical_plan: 29 passed.--test test_datafusion_varlength_complex: 22 passed.cargo clippy -p lance-graph --all-targets -- -D warnings: clean;cargo fmt --check: clean.citation_decay.py,append_only_gate.py,entries_index.py --check: clean locally. NoCargo.tomlchanges.Not in this PR
step/carrier types in code; the next PR lowers a single step in Quack.🤖 Generated with Claude Code
https://claude.ai/code/session_01VSQE2ErQwkg1zbUir7TbeM
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