Fix OverlappingFieldsCanBeMergedRule perf

[michaelstaib]

No description provided.

[github-actions]

Fusion Gateway Performance Results

Simple Composite Query

	Req/s	Err%
Constant (50 VUs)	2925.45	0.00%
Ramping (0-500-0 VUs)	3339.98	0.00%

Response Times & Query

	Min	Med	Avg	P90	P95	Max
Constant	0.78ms	15.02ms	16.86ms	31.03ms	36.52ms	171.61ms
Ramping	0.79ms	67.00ms	66.69ms	121.87ms	136.85ms	245.03ms

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)	751.66	0.00%
Ramping (0-500-0 VUs)	813.95	0.00%

Response Times & Query

	Min	Med	Avg	P90	P95	Max
Constant	8.94ms	62.07ms	64.97ms	80.77ms	89.34ms	335.67ms
Ramping	1.80ms	254.62ms	264.57ms	529.57ms	571.49ms	701.60ms

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)	23100.53	0.00%
Ramping (0-500-0 VUs)	18358.87	0.00%

Response Times & Query

	Min	Med	Avg	P90	P95	Max
Constant	0.10ms	1.75ms	2.11ms	4.02ms	4.91ms	46.02ms
Ramping	0.10ms	9.51ms	11.53ms	23.64ms	28.64ms	107.41ms

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 22146954416 • Commit 42c7cbb • Wed, 18 Feb 2026 17:15:01 GMT

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (af0d679) to head (9a6786b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff      @@
##   main   #9138   +/-   ##
============================
============================

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