[Fusion] Remove empty types after excluding all members via tagging

[glen-84]

Summary of the changes (Less than 80 chars)

• [Fusion] Remove empty types after excluding all members via tagging.

[github-actions]

Fusion Gateway Performance Results

Progress: 0/6 benchmarks completed — this report updates as each job finishes.

Simple Composite Query

	Req/s	Err%
Constant 1 (50 VUs)	pending	pending
Ramping 1 (0-500-0 VUs)	pending	pending

Response Times

	Min	Med	Avg	P90	P95	Max
Constant 1	pending	pending	pending	pending	pending	pending
Ramping 1	pending	pending	pending	pending	pending	pending

---

Deep Recursion Query

	Req/s	Err%
Constant 1 (50 VUs)	pending	pending
Ramping 1 (0-500-0 VUs)	pending	pending

Response Times

	Min	Med	Avg	P90	P95	Max
Constant 1	pending	pending	pending	pending	pending	pending
Ramping 1	pending	pending	pending	pending	pending	pending

---

Variable Batching Throughput

	Req/s	Err%
Constant 1 (50 VUs)	pending	pending
Ramping 1 (0-500-0 VUs)	pending	pending

Response Times

	Min	Med	Avg	P90	P95	Max
Constant 1	pending	pending	pending	pending	pending	pending
Ramping 1	pending	pending	pending	pending	pending	pending

---

Runner 1 = benchmarking-1

Run 22960293478 • Commit 0f432a1 • Wed, 11 Mar 2026 15:25:52 GMT

[Copilot]

Pull request overview

This PR updates Fusion source schema preprocessing so that when ExcludeByTag removes all members of a type, the now-empty type is removed from the schema (including root operation types).

Changes:

• Remove object/interface types from schema.Types if all fields were excluded by tag.
• Remove input object types if all input fields were excluded by tag, and enum types if all values were excluded by tag.
• Clear schema.QueryType / MutationType / SubscriptionType when they become empty after exclusion; add a regression test for this behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/HotChocolate/Fusion/src/Fusion.Composition/SourceSchemaPreprocessor.cs	Removes empty types after tag-based exclusion and clears empty root operation types.
src/HotChocolate/Fusion/test/Fusion.Composition.Tests/SourceSchemaPreprocessorTests.cs	Adds a test asserting empty root types and other empty types are removed after exclusion.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

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