[Fusion] Fix SourceResultDocument reading of arrays

[tobias-tengler]

Fixes #9169

[Copilot]

Pull request overview

This PR fixes SourceResultDocument raw JSON slicing for array values so that array/empty-array extensions can be parsed and forwarded correctly (addressing #9169 where empty arrays could trigger ServerParseError).

Changes:

• Fix raw-value boundary calculation for composite JSON values by correctly handling EndArray tokens.
• Add/extend tests to cover raw text extraction for arrays and forwarding of extension values including empty arrays.
• Improve debugger visualization for SourceResultDocument / SourceResultProperty.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/HotChocolate/Fusion-vnext/src/Fusion.Execution/Text/Json/SourceResultDocument.Text.cs	Fixes end-token length computation so raw extraction includes the closing ] for arrays.
src/HotChocolate/Fusion-vnext/src/Fusion.Execution/Text/Json/SourceResultDocument.cs	Adds DebuggerDisplay to show document content during debugging.
src/HotChocolate/Fusion-vnext/src/Fusion.Execution/Text/Json/SourceResultProperty.cs	Adjusts debugger display formatting for properties.
src/HotChocolate/Fusion-vnext/test/Fusion.Execution.Tests/Text/Json/SourceResultDocumentTests.cs	Adds a regression test validating GetRawText/GetRawValueAsMemory for arrays.
src/HotChocolate/Fusion-vnext/test/Fusion.AspNetCore.Tests/SourceSchemaErrorTests.cs	Extends error extensions to include scalar, array, and empty-array values.
src/HotChocolate/Fusion-vnext/test/Fusion.AspNetCore.Tests/__snapshots__/SourceSchemaErrorTests.Error_Extensions_From_Source_Schema_Are_Properly_Forwarded.yaml	Updates snapshot to include the new forwarded extension values.

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[github-actions]

Fusion Gateway Performance Results

Simple Composite Query

	Req/s	Err%
Constant (50 VUs)	2928.89	0.00%
Ramping (0-500-0 VUs)	3344.18	0.00%

Response Times & Query

	Min	Med	Avg	P90	P95	Max
Constant	0.76ms	14.95ms	16.85ms	31.02ms	36.39ms	171.22ms
Ramping	0.69ms	64.47ms	66.63ms	123.92ms	141.17ms	267.15ms

query TestQuery {
  topProducts(first: 5) {
    inStock
    name
    price
    shippingEstimate
    upc
    weight
    reviews {
      id
      body
      author {
        id
        username
        name
      }
    }
  }
}

---

Deep Recursion Query

	Req/s	Err%
Constant (50 VUs)	748.73	0.00%
Ramping (0-500-0 VUs)	833.99	0.00%

Response Times & Query

	Min	Med	Avg	P90	P95	Max
Constant	9.18ms	62.25ms	65.19ms	80.29ms	88.24ms	337.06ms
Ramping	1.83ms	257.43ms	256.88ms	492.45ms	526.39ms	666.50ms

query TestQuery {
  users {
    id
    username
    name
    reviews {
      id
      body
      product {
        inStock
        name
        price
        shippingEstimate
        upc
        weight
        reviews {
          id
          body
          author {
            id
            username
            name
            reviews {
              id
              body
              product {
                inStock
                name
                price
                shippingEstimate
                upc
                weight
              }
            }
          }
        }
      }
    }
  }
  topProducts(first: 5) {
    inStock
    name
    price
    shippingEstimate
    upc
    weight
    reviews {
      id
      body
      author {
        id
        username
        name
        reviews {
          id
          body
          product {
            inStock
            name
            price
            shippingEstimate
            upc
            weight
          }
        }
      }
    }
  }
}

---

Variable Batching Throughput

	Req/s	Err%
Constant (50 VUs)	23601.53	0.00%
Ramping (0-500-0 VUs)	18632.45	0.00%

Response Times & Query

	Min	Med	Avg	P90	P95	Max
Constant	0.10ms	1.71ms	2.07ms	3.95ms	4.83ms	45.44ms
Ramping	0.10ms	9.28ms	11.29ms	23.26ms	28.04ms	100.25ms

query TestQuery($upc: ID!, $price: Long!, $weight: Long!) {
  productByUpc(upc: $upc) {
    inStock
    shippingEstimate(weight: $weight, price: $price)
  }
}

Variables (5 sets batched per request)

[
  { "upc": "1", "price": 899, "weight": 100 },
  { "upc": "2", "price": 1299, "weight": 1000 },
  { "upc": "3", "price": 15, "weight": 20 },
  { "upc": "4", "price": 499, "weight": 100 },
  { "upc": "5", "price": 1299, "weight": 1000 }
]

---

Run 22233912726 • Commit e415395 • Fri, 20 Feb 2026 17:39:28 GMT