feat(zero-swift): aggregates, distinct and groupBy in the IVM engine

.changeset/swift-ivm-aggregates.md

@@ -0,0 +1,7 @@
+---
+'zero-swift': minor
+---
+
+Queries can compute aggregates, `distinct()` and `groupBy()` on the client, with the IVM operators of the JS client (`Aggregate`, `GroupBy`, `GroupProjection` and `LiftField`), kept up to date as rows change. The untyped builder has `count()`, `sum`, `avg`, `min` and `max` (of a column, or of a value at a JSON path: `sum(json: "metadata", "points")`), `distinct(...)`, and `groupBy(...)` followed by an aggregate, with the JS builder's checks. On a query the view holds the value; in `related(...)` the relationship does, for a junction relationship too. `min` or `max` of values JS can't compare, such as a json column without a path, fails the query with JS's error.
+
+Breaking: `ViewValue` has a new case, `.value`, an aggregate's value; an exhaustive `switch` over it needs one too.

.github/workflows/public-js.yml

@@ -13,8 +13,8 @@ on:
   workflow_dispatch:
   push:
     branches: [main]
+  # Any base, so a PR stacked on another one gets checked too.
   pull_request:
-    branches: [main]
 
 concurrency:
   group: '${{ github.workflow }} @ ${{ github.event.pull_request.head.label || github.head_ref || github.ref }}'

.github/workflows/swift-macos.yml

@@ -12,8 +12,8 @@ on:
       - 'packages/zero-conformance/**'
       - 'apps/zbugs-swift/**'
       - '.github/workflows/swift-macos.yml'
+  # Any base, so a PR stacked on another one gets checked too.
   pull_request:
-    branches: [main]
     paths:
       - 'swift/**'
       - 'packages/zero-conformance/**'

.github/workflows/swift.yml

@@ -8,8 +8,8 @@ on:
   push:
     # swift-client is the development branch until the client lands on main.
     branches: [main, swift-client]
+  # Any base, so a PR stacked on another one gets checked too.
   pull_request:
-    branches: [main]
 
 concurrency:
   group: '${{ github.workflow }} @ ${{ github.event.pull_request.head.label || github.head_ref || github.ref }}'

.github/workflows/zbugs-screenshots.yml

@@ -21,8 +21,8 @@ on:
       - 'swift/Sources/ZeroTesting/**'
       - 'swift/TestHost/**'
       - '.github/workflows/zbugs-screenshots.yml'
+  # Any base, so a PR stacked on another one gets checked too.
   pull_request:
-    branches: [main]
     paths:
       - 'apps/zbugs-swift/**'
       - 'swift/Sources/ZeroUI/**'