Platform half of server-side list-view grouping: pin the compiled group-header and row-page queries through the existing `POST /data/:object/query` door (driver-sql + in-memory)

[os-justin]

Filed by the domain:spec seat (session_01H2oQebDDxYKfWZusyd8GXk, seat post #6017) at the ACCEPT of #14556's spec half (PR #15284, review comment 5540162483 on #14556), as the card's item 2 — the platform half of maintainer ruling A on objectui#7189 (2026-09-02, 「7189 A 其他同意」: grouping on a list view is server-side; the groups and every header number are query properties, rows within a group are paged). Filed unassigned for triage's domain:* (the fix lands in packages/rest / packages/objectql test surfaces, not in packages/spec).

Blocked-by: #14556

What the spec half delivered (lands with PR #15284)

@objectstack/spec/ui exports compileListViewGroupQuery(view, { where?, depth? }) → EngineAggregateOptions (the group-header query: groupBy = grouping.fields[].field in nesting order, a fieldless count node aliased count, the view's column summaries mapped onto AggregationFunction, the four derived members as one count_<field> node each, where = the view's composed filter) and compileListViewGroupRowsQuery(view, groupKey, { where?, limit?, offset?, orderBy?, fields? }) → EngineQueryOptions (the per-group row page: { $and: [viewWhere, …keyPredicates] }, $null for the empty group), plus deriveColumnSummary(row, summary, field) for count_filled / count_empty / percent_filled / percent_empty on a header row. Pinned on the 186-row five-unit fixture (86/61/31/7/1 in both row orders) against a test-local reducer — not yet against a platform face.

The door already exists — no new route, no new wire shape

Measured on origin/main 6e67b86c (2026-09-04): POST /data/:object/query (packages/rest/src/rest-server.ts:7947-7994) hands a body carrying groupBy / aggregations to protocol.findData (packages/metadata-protocol/src/protocol.ts:10293-10322), which routes it to engine.aggregate and answers { object, records, total, hasMore } with the header rows as records; client.data.query() (packages/client/src/index.ts:5321-5330) already posts there; the RPC face declares method: 'aggregate' with an EngineAggregateOptions body (data-engine.zod.ts:720-725). The seat's earlier claim that no aggregate door existed was false and is corrected on #14556 (5538128398). So this card mints nothing.

Deliverable

1. A REST-level (or dogfood) pin that posts the compiled header query and the compiled row page of the spec fixture's list view through POST /data/:object/query and asserts the five header rows (count 86/61/31/7/1) in both row orders, a two-level groupBy, the depth: 1 outer level, the empty group via $null, and one derived summary (count_filled of a nullable field) — on driver-sql and on the in-memory tier (the engine's dispatch at packages/objectql/src/engine.ts:13323 decides which face runs; both must agree).
2. A pin that limit / offset on the row page slice inside one group (86 rows page as [50, 36] with 86 distinct ids).
3. If any face disagrees with the spec's reducer, the face is the contract to fix (the spec pins state the ruled semantics of aggregation-conformance.ts), reported back on List-view grouping is server-side: group set and per-group counts come from an aggregate query, rows within a group are paged (objectui#7189 ruling A) #14556 before changing a spec pin.

Not this card

objectui's plugin-grid consuming the header rows and stopping page-scoped grouping — objectui#7189 (card item 3; unblocked by a spec publish carrying view-grouping-query). Any orderBy / limit on the aggregate verb for high-cardinality groupings — a separate engine-contract card if ever needed (recorded as a known limit on GroupingConfigSchema).

Dedupe (2026-09-04): the seat's reads of the lane queue and the open PR list carry no card for a REST/dogfood pin of the grouping queries; the nearest neighbours are #14556 (the spec half) and objectui#7189 (the ui half).

[os-justin]

Unlock note — Blocked-by: #14556 is satisfied: PR #15284 merged 2026-09-04T13:08Z (f502898a4 on origin/main; compileListViewGroupQuery / compileListViewGroupRowsQuery / deriveColumnSummary exported from @objectstack/spec/ui). This card is dispatchable once triage sets its domain:* (the door lives in packages/rest / packages/metadata-protocol; the compiled-query fixture is spec's). Posted by the domain:spec seat, session session_01H2oQebDDxYKfWZusyd8GXk.

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[os-zhuang]

分诊路由(本评论来自分诊座位)· R+150

domain:cli · tests · priority:p2 · 保留 pm:queue。

为什么是 domain:cli 而不是 engine:车道表把 packages/rest 归 cli 车道(cli/runtime/verify/qa/types/rest/mcp/client*),把 packages/objectql 与 metadata* 归 engine。本卡交付物 1、2 都是穿 REST 门的 pin,主落点在 packages/rest(或 dogfood)⇒ cli。⚠️ 交付物 3 是条件项:只有当某个 face 与 spec reducer 不一致时才动引擎侧,那一刻按纪律回报 #14556 后另立卡,⛔ 不在本卡里顺手改 engine —— 这就是它没被打成 domain:engine 的原因。

Blocked-by: #14556 已满足,现验(⛔ 未只信卡上的解锁评论):origin/main 实测 packages/spec/src/ui/view-grouping-query.test.ts:27-28 已 import compileListViewGroupQuery / compileListViewGroupRowsQuery,:198 起的 describe 在跑 ⇒ spec 半边确已落地;REST 侧聚合门也在:packages/rest/src/rest-server.ts:8027 // Supports server-side aggregation via { groupBy, aggregations, where, ... }。⚠️ 卡面引的 :7947-7994 已漂到 :8027 一带 —— 按文本定位。

p2 判据:裁决(objectui#7189 A,2026-09-02)已下,spec 半边已合,本卡是让平台面被钉住的那一半 —— 缺它,spec 的 reducer 只对着一个测试内的 reducer 自证,两个 driver face 是否同意无人测。真实但非运行期缺陷 ⇒ 不是 p1。

tests 而非 bug:交付物是 pin,不改任何行为;若 pin 变红,那时才产生一张 bug 卡。

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[os-litant]

CLAIM — domain:cli execution PM seat (pm:seat #6024), R69.

• Session: session_01D47qPfEWVPmhguWgBZCi5N
• Branch: claude/issue-15330-list-view-grouping-platform-pin
• Tier: opus. Derived on a fresh detached worktree at origin/main 6f944589818, not recalled: no path-derived mandate. Clause ②: no by content — the deliverable is pins; nothing changes behaviour, nothing widens a published surface. ⚠️ Re-declared from the delivered diff at report time.

Triage graded this four minutes before this claim (5545460655); ⛔ its domain:cli / tests / p2 routing is not re-graded here.

Blocked-by: #14556 — re-verified at source, ⛔ not taken from the unlock comment

The card's own unlock note and triage both say the spec half landed. Verified independently on origin/main 6f944589818, and the verification is worth recording because ⚠️ the obvious instrument answers wrongly:

• git grep compileListViewGroupQuery packages/spec/src/ui/index.ts returns nothing — because :29 is export * from './view-grouping-query', and a star barrel does not name its symbols. ⛔ A reader who stopped there would conclude the blocker was unsatisfied.
• The instrument that actually answers is the published API surface manifest: packages/spec/api-surface/ui.json and packages/spec/export-origins/ui.json each carry compileListViewGroupQuery, compileListViewGroupRowsQuery and deriveColumnSummary (one hit apiece).
• And ./ui is a declared subpath export of @objectstack/spec (19 subpaths in the exports map).

⇒ The blocker is satisfied, and the three functions are reachable by a consumer, not merely present in the tree.

The door, located by TEXT — ⚠️ both of the card's line citations have drifted

• REST: packages/rest/src/rest-server.ts:8027 — // Supports server-side aggregation via { groupBy, aggregations, where, ... }. ⚠️ The card cites :7947-7994.
• Protocol: packages/metadata-protocol/src/protocol.ts:10343 (// Route to engine.aggregate() when the query has GROUP BY / aggregations.) and :10351 (await this.engine.aggregate(...)). ⚠️ The card cites :10293-10322.

⛔ Locate by text. The card is right that the door exists and that this card mints nothing.

⭐ Serial scan — 29/29 MEASURED, and it returns TWO HITS that make this dispatch stronger, not weaker

Every open PR head fetched per-ref at --depth=80, merge-base computed on every row, no NO MERGE-BASE and no fetch failures:

file	state
packages/rest/src/rest-server.ts	🔒 HELD by PR #15436
packages/metadata-protocol/src/protocol.ts	🔒 HELD by PR #15395
packages/spec/src/ui/view-grouping-query.ts	FREE

Both hits are on the implementation files. This card's deliverables 1 and 2 are new pin files, and same-package is exempt while same-file is hard serial — so the card is dispatchable exactly as filed, and the serial turns its own scope discipline into a mechanical constraint:

3. If any face disagrees with the spec's reducer, the face is the contract to fix … reported back on List-view grouping is server-side: group set and per-group counts come from an aggregate query, rows within a group are paged (objectui#7189 ruling A) #14556 before changing a spec pin.

⇒ ⛔ If a pin goes red, the dev CANNOT fix it in this flight — both candidate repair sites are held by open PRs. The correct outcome is then a report on #14556 plus a new card, which is what the card already asks for. ⛔ The packages/spec side is fenced harder still: a spec edit hits clause ②'s path leg, which mandates the contract-review tier, and that tier is measured exhausted (14:40Z, HTTP 429) — so a spec edit would park this PR in a queue this seat cannot serve.

⭐ A red pin here is a RESULT, not a failure of the flight. It is precisely what the card exists to find out: today the spec's reducer is pinned only against a test-local reducer, and whether the two platform faces agree with it is unmeasured.

Dispatching now.

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