feat(spec,cli): validate dataset measure aggregation by field semantics#2208
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A measure that SUMs a percentage/rate field produces a meaningless total (it can exceed 100%); rates must AVG. Authoring tools and `os validate` had no notion of this, so a hand-authored — or AI-authored — dataset could summon a "win-probability" measure as SUM and pass every check. - @objectstack/spec/data: new aggregation-policy — `defaultAggregateFor` (rates AVG, amounts SUM) and `isIncoherentAggregate`. The single source of truth for field→aggregation semantics, shared by authoring (dataset derivation) and validation so the two cannot drift. - @objectstack/cli validateWidgetBindings: new `measure-aggregate-incoherent` advisory — checks every dataset's measures against its object's field types and flags SUM/count_distinct of a percent field. Runs at validate/compile/build through the existing widget-binding pass; never false-positives when the object's field types are unknown. Tests: spec policy unit tests + cli validator cases (sum-on-percent flagged, avg clean, currency-sum clean, no-objects no-op, count_distinct flagged).
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📓 Docs Drift CheckThis PR changes 2 package(s): 93 hand-written doc(s) reference the affected code and may need an implementation-accuracy re-verification:
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xuyushun441-sys
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Jun 22, 2026
…rts (#2209) #2208 added three @objectstack/spec/data exports (defaultAggregateFor, isIncoherentAggregate, MEASURE_FIELD_TYPES) but did not regenerate the public API-surface snapshot, so the `check:api-surface` gate failed on main. Intentional addition: 0 breaking, 3 added. Co-authored-by: Jack Zhuang <277994282+os-zhuang@users.noreply.github.com>
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Why
A dataset measure that SUMs a
percent/rate field produces a meaningless total (it routinely exceeds 100%) — rates must AVG. Nothing at author time knew this, so a hand-authored or AI-authored dataset could declare a win-probability measure assumand passos validate/compileclean. (Surfaced on a live AI-built CRM dashboard: a probability column summed to 145%, 200%.)What
@objectstack/spec/data— newaggregation-policy(the single source of truth for field→aggregation semantics, shared by authoring and validation so they can't drift):defaultAggregateFor(fieldType)— rates (percent) AVG, additive amounts SUM.isIncoherentAggregate(aggregate, fieldType)— true only for genuinely meaningless cases (today: SUM/count_distinctof a percent); never raises when the type is unknown.@objectstack/clivalidateWidgetBindings— newmeasure-aggregate-incoherentadvisory: checks every dataset's measures against its bound object's field types and flags an incoherent aggregation. Runs at validate/compile/build through the existing widget-binding pass; never false-positives without the object's field types (e.g. cross-package datasets).Notes
suppressWarnings: ['measure-aggregate-incoherent'].isIncoherentAggregateto replace its local copy.Tests
aggregation-policy.test.ts(policy + coherence matrix).validate-widget-bindings.test.ts— sum-on-percent flagged, avg clean, currency-sum clean,count_distinct-of-percent flagged, no-objects no-op. 33/33 in that file; 6612 spec tests green.🤖 Generated with Claude Code