Elamur Groupantskg-cols-column-views
The groupant beside kg/src/cols.rs in the Mova repository: what the code computes, what it never does, how to go back from its outputs, its invariants, cost and checks.
Facts
Implementation material. A Mova code model describes this code at one source revision: partial models, finite checks and their stated scope. It is not a reviewed general exposition, and its labels are shown as written, never raised.
Components
| component | label | where |
|---|---|---|
| approximant | partial | approximant |
| ast | partial | ../syntax.json |
| composition | partial | composition |
| cost | partial | cost |
| descriptant | present | descriptant |
| invariant | partial | invariant |
| tests | executed bounded checks | tests |
Obernants
The typed relations around the forward model: the behaviour complement (what the code never does), the reverse reconstruction (every input compatible with an output) and specialised views.
| id | type | label | where |
|---|---|---|---|
behavior_complement | behavior_complement | partial source derived model | behavior_complement |
reverse_reconstruction | reverse_reconstruction | partial source derived model | reverse_reconstruction |
zero_mask | zero_mask | partial source derived model | zero_mask |
ties | ties | partial source derived model | ties |
alignment | alignment | partial source derived model | alignment |
index_width | index_width | partial source derived model | index_width |
Model text
descriptant
kg-cols-column-views
Aligned tuple push, unstable sort, mask selection and outgoing range.
Modeling epoch — 2026-10-31
Source read before tests and models; retained prospective notes accompany the parent. Current evidence uses bounded invented inputs only. This is partial modeling, not proof or corpus accuracy.
approximant
Forward relation
Push six coordinates; sort one index permutation by(src,rel,dst); mask keeps every row satisfying conjunction of bits; out uses sorted-src lower/upper bounds.
Executable approximant gap
Exact categorical structure, identifiers, parser decisions and effects have no useful percentage metric established here. No executable surrogate, automatic substitution or 1/2/5/10% guarantee is claimed.
invariant
Invariant and domain
Aligned n<2^32 keeps tuple associations; filter preserves input order.
Cost and resources
sort O(n log n)/O(n), filter O(n), out O(log n).
cost
Cost and resources
sort O(n log n)/O(n), filter O(n), out O(log n).
composition
Composition
Aligned tuple push, unstable sort, mask selection and outgoing range.
Push six coordinates; sort one index permutation by(src,rel,dst); mask keeps every row satisfying conjunction of bits; out uses sorted-src lower/upper bounds.
The parent invokes scoped transformations through the actual functions named in their source ranges. Children partition useful observations, not a complete semantic proof; boundaries can omit helpers, tests and effects.
models
behavior_complement
No missing-bit row survives filter. Sorting does not merge duplicates, and out does not repair unsorted inputs.
reverse_reconstruction
Filter preimage includes arbitrary rejected rows; sort preimage includes permutations and equal-key tie histories.
zero_mask
mask0 retains all, including flags0.
ties
Equal(src,rel,dst) ties use unstable sort; gs/gd/flags do not break ties.
alignment
Public unequal column lengths can panic; source length alone defines len.
index_width
sort casts n to u32; domain excludes n>=2^32 to preserve rows.
tests
Evidence
Parent source checks (a fragment inherits only the behavior they actually exercise):
- cols::tests::roundtrip_and_filter
- cols::wave29::codec_boundaries_and_errors
Selected kg tests: 15 named outcomes, twice debug/twice release, equal sorted outcomes. Standalone actual global/build.rs: 3 named outcomes per run, twice debug/twice optimized; build_child is normally no-op, parent fixture invokes it against isolated synthetic seeds. Eight compiled source mutations (one per source) each compiled successfully and exited101 on the focused assertion; exact source restoration followed by positive rerun.
This fragment's untested branches remain source-derived. No live graph, DB, corpus, teacher, GPU or held-out evaluation was used. Command specs and numeric exits are retained in the external wave29 graphlang receipt. Strict kg Clippy reports existing source lints; see receipt.
This page in Markdown → https://md.groupants.elamur.ai/free/en/mova/kg/src/cols.rs.groupant/column-views.groupant/