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os-zhuang merged 1 commit into from
Oct 4, 2026
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docs(skills): date-bucket engine sentences name what each arm emits #21677

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8 changes: 4 additions & 4 deletions skills/objectstack-query/rules/aggregation.md
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Expand Up @@ -79,10 +79,10 @@ aggregations (never bucket by hand in app code):
the projected COLUMN only** — grouping still keys on the field, so the buckets
themselves are unchanged. Read the result under `alias ?? field`, and reference
that same name from `having`.
- The engine pushes bucketing down to the driver (`DATE_TRUNC` etc.) when
the dialect supports that granularity, and transparently falls back to
in-memory bucketing otherwise — results are correct either way, **including
the column keys**.
- The engine pushes bucketing down to the driver (`to_char` / `date_format` /
`strftime` / `$dateToString`, never `date_trunc`) when the dialect supports
that granularity, and transparently falls back to in-memory bucketing
otherwise — results are correct either way, **including the column keys**.

## HAVING Clause

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8 changes: 4 additions & 4 deletions skills/objectstack-ui/rules/dashboards.md
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Expand Up @@ -318,14 +318,14 @@ const signedByMonth: DashboardWidget = { id: 'signed_by_month', type: 'line',
| `dateGranularity` | Rendered bucket label |
|:--|:--|
| `'day'` | `YYYY-MM-DD` |
| `'week'` | ISO date of the bucket (`YYYY-MM-DD`) |
| `'week'` | ISO week `YYYY-Www` |
| `'month'` | `YYYY-MM` |
| `'quarter'` | `YYYY-Qn` |
| `'year'` | `YYYY` |

* **Engine support** — Postgres `date_trunc`, MySQL `date_format`, SQLite
`strftime`, MongoDB `$dateTrunc`, in-memory fallback. All emitted by the
analytics service, not the client.
* **Engine support** — drivers emit the bucket as a label (`2026-01`), not
an instant: Postgres `to_char`, MySQL `date_format`, SQLite `strftime`,
MongoDB `$dateToString`, in-memory `bucketDateKey`.
* **Human labels are automatic** — the analytics layer formats the bucket value
to the label above, and resolves `select`/`lookup` dimension values to their
option label / related-record name. Measures carry their `label` + `format`
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