feat: add `requestedFields` sparse fieldset filtering to both execution engines by Copilot · Pull Request #81 · stackables/bridge

Copilot · 2026-03-04T13:13:49Z

Phase 1 of the Sparse Fieldsets architecture. Both executeBridge engines now accept requestedFields?: string[] to resolve only the listed output fields. Unrequested tools are never called (interpreter) or never compiled (compiler).

const { data } = await executeBridge({
  document,
  operation: "Query.searchTrains",
  input: { from: "Bern", to: "Zürich" },
  requestedFields: ["id", "status", "legs.*"],
  tools: { /* ... */ },
});
// → only resolves id, status, legs.* — skips tools that feed other fields

Pattern syntax

Dot-separated paths with optional trailing wildcard: "id", "legs.duration", "legs.*".

Core changes

bridge-core/src/requested-fields.ts — new utility: matchesRequestedFields() and filterOutputFields() with exact, ancestor/descendant, and * wildcard matching
Interpreter (bridge-core) — run() filters output fields before the pull loop; resolveNestedField() also respects the filter for nested sub-fields. Pull-based execution naturally orphans unreachable tools.
Compiler (bridge-compiler) — filters output wires at codegen time. Dead code detection upgraded from a flat single-pass scan to backward reachability (transitive closure from output wires through tool input dependencies), so tools only reachable through pruned outputs are eliminated. Cache key includes sorted requestedFields for shape-specific compiled functions.

Tests

20 new shared parity tests (both engines):

Tools that only feed unrequested fields throw on invocation → proves they're never called
(A || B → C) graph: requesting fromA skips B and C; requesting fromB skips A but calls B with fallback to C
Wildcard, multi-field, nested path, and no-filter backward-compat cases

Docs

New advanced/sparse-fieldsets.mdx doc page
Updated bridge-compiler README

Warning

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I tried to connect to the following addresses, but was blocked by firewall rules:

api.open-meteo.com
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- Triggering command: /opt/hostedtoolcache/node/24.13.1/x64/bin/node /opt/hostedtoolcache/node/24.13.1/x64/bin/node --heap-prof-interval=524288 --cpu-prof-interval=1000 --test-coverage-functions=0 --test-concurrency=0 --inspect-publish-uid=stderr,http --inspect-port=127.0.0.1:9229 --experimental-transform-types --report-signal=SIGUSR2 --test-coverage-lines=0 --test-isolation=process --conditions=source --tls-cipher-list=TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256:TLS_AES_128_GCM_SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-SHA tsc -p tsconfig.INVALID,NEW 1/x64/bin/node n/sh tsc -p tsconfig.sh (dns block)
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dummyjson.com
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nominatim.openstreetmap.org
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sparrow.cloudflare.com
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telemetry.astro.build
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transport.opendata.ch
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v6.db.api.bahn.guru
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Original prompt

This section details on the original issue you should resolve

<issue_title>Unified Sparse Fieldsets & GraphQL Lookahead Architecture</issue_title>
<issue_description>Epic: Core Execution Engine & API Adapters
Status: Planned
Impact: Eliminates the "GraphQL Tax" (N+1 overhead), introduces Dead-Code Elimination to the AOT compiler, and standardizes payload subsetting across REST and GraphQL.

Overview

Currently, the Bridge GraphQL adapter relies on standard recursive field resolvers, which forces the execution engine to fight the GraphQL runner. Meanwhile, the standalone executeBridge fetches the entire .bridge schema graph regardless of what the client actually needs.

This epic unifies both environments by introducing Sparse Fieldsets (requestedFields) to the core engines, and refactoring the GraphQL adapter into a pure "Lookahead" translation layer.

Phase 1: Core Engine Upgrades (executeBridge)

Both @stackables/bridge-core (Interpreter) and @stackables/bridge-compiler (AOT) need to accept a unified syntax for requesting partial data.

API Update: Add requestedFields?: string[] to ExecuteBridgeOptions.

Glob Syntax: Implement a dot-separated wildcard parser (e.g., ["id", "price", "legs.*"]) to match against output wire paths.

Interpreter (bridge-core) implementation: * Filter the initial outputWires against requestedFields before beginning the pull loop.

Because the interpreter is pull-based, dropping an output wire automatically orphans the unneeded tools, skipping their execution.

Compiler (bridge-compiler) implementation:

Filter output wires during code generation.

Kahn's Algorithm will mathematically eliminate the dead code (unreachable tools).

Update the fnCache WeakMap key to include the sorted requestedFields so different query shapes cache distinct, perfectly sized native functions.

Phase 2: Standalone / REST Integration

Expose the new requestedFields array to standalone consumers, allowing Bridge to power highly efficient REST/RPC endpoints.

Documentation Update: Show how to map HTTP query parameters to the engine.

Example: GET /api/trains?fields=id,status,legs.duration

Handler: executeBridge({ document, operation: "Query.trains", requestedFields: req.query.fields.split(",") })

Result: Mobile apps can request lightweight payloads, and desktop apps can request heavy payloads, all routed through the same compiled .bridge file without downstream over-fetching.

Phase 3: The GraphQL Adapter Refactor

Transform @stackables/bridge-graphql from a recursive execution engine into a Root-Level Lookahead Translator. Bridge handles the execution; GraphQL merely handles the schema and validation. GraphQL adapter will accept optional executor.

Drop Per-Field Resolvers: Stop generating resolver functions for every nested object/field in the GraphQL schema.

Extract Selection Set: Write a recursive helper to parse the 4th argument (GraphQLResolveInfo) in root queries/mutations. Translate info.selectionSet into the flat, dot-separated requestedFields array (e.g., { train { id, status } } ➡️ ["train.id", "train.status"]).

Unified Injection: * Inject the requested fields into the injected executor (either Core or Compiler).

Bridge executes the exact subset of tools required in a single pass.

Return the perfectly shaped JSON directly to the GraphQL engine, which simply passes it through to the client.

</issue_description>

<agent_instructions>Implement phase 1. make sure to include

end user docs

bridge level lang tests that are run against both engines

test has to cover dropping unrequested tool calls

test with (A || B -> C) where A is independently wired and C depends on B. each wiring directly or indirectly to output that can be controlled with the test</agent_instructions>

Comments on the Issue (you are @copilot in this section)

Fixes Unified Sparse Fieldsets & GraphQL Lookahead Architecture #79

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

changeset-bot · 2026-03-04T13:13:54Z

🦋 Changeset detected

Latest commit: f194369

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

This PR includes changesets to release 5 packages

Name	Type
@stackables/bridge-core	Minor
@stackables/bridge-compiler	Minor
@stackables/bridge-graphql	Patch
@stackables/bridge-parser	Patch
@stackables/bridge	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

github-actions · 2026-03-04T13:16:49Z

Bencher Report

Branch	copilot/unify-sparse-fieldsets
Testbed	ubuntu-latest

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Benchmark	Latency	nanoseconds (ns)
compiled: absolute baseline (passthrough, no tools)	📈 view plot ⚠️ NO THRESHOLD	0.00 ns
compiled: array + tool-per-element 10	📈 view plot ⚠️ NO THRESHOLD	0.01 ns
compiled: array + tool-per-element 100	📈 view plot ⚠️ NO THRESHOLD	0.03 ns
compiled: chained 3-tool fan-out	📈 view plot ⚠️ NO THRESHOLD	0.00 ns
compiled: flat array 10 items	📈 view plot ⚠️ NO THRESHOLD	0.01 ns
compiled: flat array 100 items	📈 view plot ⚠️ NO THRESHOLD	0.01 ns
compiled: flat array 1000 items	📈 view plot ⚠️ NO THRESHOLD	0.07 ns
compiled: nested array 10x10	📈 view plot ⚠️ NO THRESHOLD	0.02 ns
compiled: nested array 20x10	📈 view plot ⚠️ NO THRESHOLD	0.04 ns
compiled: nested array 5x5	📈 view plot ⚠️ NO THRESHOLD	0.01 ns
compiled: short-circuit (overdefinition bypass)	📈 view plot ⚠️ NO THRESHOLD	0.00 ns
compiled: simple chain (1 tool)	📈 view plot ⚠️ NO THRESHOLD	0.00 ns
exec: absolute baseline (passthrough, no tools)	📈 view plot ⚠️ NO THRESHOLD	0.00 ns
exec: array + tool-per-element 10	📈 view plot ⚠️ NO THRESHOLD	0.08 ns
exec: array + tool-per-element 100	📈 view plot ⚠️ NO THRESHOLD	0.74 ns
exec: chained 3-tool fan-out	📈 view plot ⚠️ NO THRESHOLD	0.02 ns
exec: flat array 10 items	📈 view plot ⚠️ NO THRESHOLD	0.01 ns
exec: flat array 100 items	📈 view plot ⚠️ NO THRESHOLD	0.07 ns
exec: flat array 1000 items	📈 view plot ⚠️ NO THRESHOLD	0.65 ns
exec: nested array 10x10	📈 view plot ⚠️ NO THRESHOLD	0.12 ns
exec: nested array 20x10	📈 view plot ⚠️ NO THRESHOLD	0.23 ns
exec: nested array 5x5	📈 view plot ⚠️ NO THRESHOLD	0.05 ns
exec: short-circuit (overdefinition bypass)	📈 view plot ⚠️ NO THRESHOLD	0.00 ns
exec: simple chain (1 tool)	📈 view plot ⚠️ NO THRESHOLD	0.01 ns
parse: large bridge (20 handles x 5 wires)	📈 view plot ⚠️ NO THRESHOLD	0.92 ns
parse: simple bridge	📈 view plot ⚠️ NO THRESHOLD	0.03 ns

🐰 View full continuous benchmarking report in Bencher

…iler engines - Add requestedFields option to ExecuteBridgeOptions in bridge-core and bridge-compiler - Implement matchesRequestedFields utility with dot-separated path and wildcard support - Runtime: filter output fields in ExecutionTree.run() and resolveNestedField() - Compiler: filter output wires and use backward reachability for dead code elimination - Update compiler cache key to include sorted requestedFields - Add 20 shared parity tests covering field filtering, tool skipping, A||B→C chains, wildcards Co-authored-by: aarne <82001+aarne@users.noreply.github.com>

cloudflare-workers-and-pages · 2026-03-04T13:30:11Z

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	bridge	`f194369`	Commit Preview URL Branch Preview URL	Mar 04 2026, 02:39 PM

Co-authored-by: aarne <82001+aarne@users.noreply.github.com>

* feat: add `requestedFields` sparse fieldset filtering to both execution engines (#81) * Initial plan * feat: add requestedFields (sparse fieldsets) to both runtime and compiler engines - Add requestedFields option to ExecuteBridgeOptions in bridge-core and bridge-compiler - Implement matchesRequestedFields utility with dot-separated path and wildcard support - Runtime: filter output fields in ExecutionTree.run() and resolveNestedField() - Compiler: filter output wires and use backward reachability for dead code elimination - Update compiler cache key to include sorted requestedFields - Add 20 shared parity tests covering field filtering, tool skipping, A||B→C chains, wildcards Co-authored-by: aarne <82001+aarne@users.noreply.github.com> * docs: add sparse fieldsets documentation and changeset Co-authored-by: aarne <82001+aarne@users.noreply.github.com> * refactor: address code review feedback (validation, perf, docs) Co-authored-by: aarne <82001+aarne@users.noreply.github.com> * Lint & build * Move graphql tests * refactor: remove check exports script and related commands * Reorder and update CI steps in test workflow --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: aarne <82001+aarne@users.noreply.github.com> Co-authored-by: Aarne Laur <aarne.laur@gmail.com> * CLI mode in the Playground * docs: Review --------- Co-authored-by: Copilot <198982749+Copilot@users.noreply.github.com> Co-authored-by: aarne <82001+aarne@users.noreply.github.com>

Initial plan

e9e260b

Copilot AI assigned Copilot and aarne Mar 4, 2026

Copilot started work on behalf of aarne March 4, 2026 13:13 View session

aarne changed the base branch from main to sparse_fieldsets March 4, 2026 13:14

Copilot AI and others added 2 commits March 4, 2026 13:36

docs: add sparse fieldsets documentation and changeset

3052a7d

Co-authored-by: aarne <82001+aarne@users.noreply.github.com>

refactor: address code review feedback (validation, perf, docs)

81fbc10

Co-authored-by: aarne <82001+aarne@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Implement unified sparse fieldsets and GraphQL lookahead architecture~~ feat: add requestedFields sparse fieldset filtering to both execution engines Mar 4, 2026

Copilot finished work on behalf of aarne March 4, 2026 13:43

aarne marked this pull request as ready for review March 4, 2026 13:53

aarne added 4 commits March 4, 2026 14:58

Lint & build

397904f

Move graphql tests

0802069

refactor: remove check exports script and related commands

686a6b4

Reorder and update CI steps in test workflow

f194369

aarne merged commit b4e25cc into sparse_fieldsets Mar 4, 2026
4 checks passed

aarne deleted the copilot/unify-sparse-fieldsets branch March 4, 2026 14:39

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feat: add `requestedFields` sparse fieldset filtering to both execution engines#81

feat: add `requestedFields` sparse fieldset filtering to both execution engines#81
aarne merged 8 commits intosparse_fieldsetsfrom
copilot/unify-sparse-fieldsets

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I tried to connect to the following addresses, but was blocked by firewall rules:

Overview

Phase 1: Core Engine Upgrades (executeBridge)

Phase 2: Standalone / REST Integration

Phase 3: The GraphQL Adapter Refactor

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Copilot AI commented Mar 4, 2026 •

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Phase 1: Core Engine Upgrades (`executeBridge`)

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