WIP fix loadSubset when orderby has multiple columns

[samwillis]

Enhanced multi-column orderBy support with lazy loading and composite cursor optimization.

Changes:

• Create index on first orderBy column even for multi-column orderBy queries, enabling lazy loading with first-column ordering
• Pass multi-column orderBy to loadSubset with precise composite cursors (e.g., or(gt(col1, v1), and(eq(col1, v1), gt(col2, v2)))) for backend optimization
• Use wide bounds (first column only) for local index operations to ensure no rows are missed
• Use precise composite cursor for sync layer loadSubset to minimize data transfer

Benefits:

• Multi-column orderBy queries with limit now support lazy loading (previously disabled)
• Sync implementations (like Electric) can optimize queries using composite indexes on the backend
• Local collection uses first-column index efficiently while backend gets precise cursor

Prior to this change composite order by was broken as shown in the first commit CI run: https://github.com/TanStack/db/actions/runs/19741724803/job/56567001027

[changeset-bot]

🦋 Changeset detected

Latest commit: 28fa29f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 11 packages

Name	Type
@tanstack/db	Patch
@tanstack/angular-db	Patch
@tanstack/db-collection-e2e	Patch
@tanstack/electric-db-collection	Patch
@tanstack/powersync-db-collection	Patch
@tanstack/react-db	Patch
@tanstack/rxdb-db-collection	Patch
@tanstack/solid-db	Patch
@tanstack/svelte-db	Patch
@tanstack/trailbase-db-collection	Patch
@tanstack/vue-db	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[pkg-pr-new]

More templates

• todos
• tanstack-start-example-basic
• @tanstack/db-example-paced-mutations-demo
• tanstack-start-db-projects-example
• @tanstack/db-example-react-todo
• @tanstack/db-example-solid-todo

@tanstack/angular-db

npm i https://pkg.pr.new/@tanstack/angular-db@926

@tanstack/db

npm i https://pkg.pr.new/@tanstack/db@926

@tanstack/db-ivm

npm i https://pkg.pr.new/@tanstack/db-ivm@926

@tanstack/electric-db-collection

npm i https://pkg.pr.new/@tanstack/electric-db-collection@926

@tanstack/offline-transactions

npm i https://pkg.pr.new/@tanstack/offline-transactions@926

@tanstack/powersync-db-collection

npm i https://pkg.pr.new/@tanstack/powersync-db-collection@926

@tanstack/query-db-collection

npm i https://pkg.pr.new/@tanstack/query-db-collection@926

@tanstack/react-db

npm i https://pkg.pr.new/@tanstack/react-db@926

@tanstack/rxdb-db-collection

npm i https://pkg.pr.new/@tanstack/rxdb-db-collection@926

@tanstack/solid-db

npm i https://pkg.pr.new/@tanstack/solid-db@926

@tanstack/svelte-db

npm i https://pkg.pr.new/@tanstack/svelte-db@926

@tanstack/trailbase-db-collection

npm i https://pkg.pr.new/@tanstack/trailbase-db-collection@926

@tanstack/vue-db

npm i https://pkg.pr.new/@tanstack/vue-db@926

commit: 28fa29f

[github-actions]

Size Change: +615 B (+0.71%)

Total Size: 87.7 kB

Filename	Size	Change
./packages/db/dist/esm/collection/subscription.js	2.96 kB	+409 B (+16.06%)	⚠️
./packages/db/dist/esm/query/compiler/order-by.js	1.46 kB	+206 B (+16.48%)	⚠️

ℹ️ View Unchanged

Filename	Size
./packages/db/dist/esm/collection/change-events.js	1.38 kB
./packages/db/dist/esm/collection/changes.js	977 B
./packages/db/dist/esm/collection/events.js	388 B
./packages/db/dist/esm/collection/index.js	3.24 kB
./packages/db/dist/esm/collection/indexes.js	1.1 kB
./packages/db/dist/esm/collection/lifecycle.js	1.67 kB
./packages/db/dist/esm/collection/mutations.js	2.31 kB
./packages/db/dist/esm/collection/state.js	3.43 kB
./packages/db/dist/esm/collection/sync.js	2.37 kB
./packages/db/dist/esm/deferred.js	207 B
./packages/db/dist/esm/errors.js	4.19 kB
./packages/db/dist/esm/event-emitter.js	748 B
./packages/db/dist/esm/index.js	2.64 kB
./packages/db/dist/esm/indexes/auto-index.js	742 B
./packages/db/dist/esm/indexes/base-index.js	766 B
./packages/db/dist/esm/indexes/btree-index.js	1.87 kB
./packages/db/dist/esm/indexes/lazy-index.js	1.1 kB
./packages/db/dist/esm/indexes/reverse-index.js	513 B
./packages/db/dist/esm/local-only.js	837 B
./packages/db/dist/esm/local-storage.js	2.1 kB
./packages/db/dist/esm/optimistic-action.js	359 B
./packages/db/dist/esm/paced-mutations.js	496 B
./packages/db/dist/esm/proxy.js	3.69 kB
./packages/db/dist/esm/query/builder/functions.js	733 B
./packages/db/dist/esm/query/builder/index.js	3.96 kB
./packages/db/dist/esm/query/builder/ref-proxy.js	917 B
./packages/db/dist/esm/query/compiler/evaluators.js	1.35 kB
./packages/db/dist/esm/query/compiler/expressions.js	430 B
./packages/db/dist/esm/query/compiler/group-by.js	1.8 kB
./packages/db/dist/esm/query/compiler/index.js	1.96 kB
./packages/db/dist/esm/query/compiler/joins.js	2 kB
./packages/db/dist/esm/query/compiler/select.js	1.07 kB
./packages/db/dist/esm/query/expression-helpers.js	1.43 kB
./packages/db/dist/esm/query/ir.js	673 B
./packages/db/dist/esm/query/live-query-collection.js	360 B
./packages/db/dist/esm/query/live/collection-config-builder.js	5.33 kB
./packages/db/dist/esm/query/live/collection-registry.js	264 B
./packages/db/dist/esm/query/live/collection-subscriber.js	1.74 kB
./packages/db/dist/esm/query/live/internal.js	130 B
./packages/db/dist/esm/query/optimizer.js	2.56 kB
./packages/db/dist/esm/query/predicate-utils.js	2.91 kB
./packages/db/dist/esm/query/subset-dedupe.js	921 B
./packages/db/dist/esm/scheduler.js	1.3 kB
./packages/db/dist/esm/SortedMap.js	1.18 kB
./packages/db/dist/esm/strategies/debounceStrategy.js	247 B
./packages/db/dist/esm/strategies/queueStrategy.js	428 B
./packages/db/dist/esm/strategies/throttleStrategy.js	246 B
./packages/db/dist/esm/transactions.js	2.9 kB
./packages/db/dist/esm/utils.js	881 B
./packages/db/dist/esm/utils/browser-polyfills.js	304 B
./packages/db/dist/esm/utils/btree.js	5.61 kB
./packages/db/dist/esm/utils/comparison.js	852 B
./packages/db/dist/esm/utils/index-optimization.js	1.51 kB
./packages/db/dist/esm/utils/type-guards.js	157 B

_{compressed-size-action::db-package-size}

[github-actions]

Size Change: 0 B

Total Size: 3.34 kB

ℹ️ View Unchanged

Filename	Size
./packages/react-db/dist/esm/index.js	225 B
./packages/react-db/dist/esm/useLiveInfiniteQuery.js	1.17 kB
./packages/react-db/dist/esm/useLiveQuery.js	1.11 kB
./packages/react-db/dist/esm/useLiveSuspenseQuery.js	431 B
./packages/react-db/dist/esm/usePacedMutations.js	401 B

_{compressed-size-action::react-db-package-size}