Fix handle single-type abstract selection in AsSelector

[michaelstaib]

Fixes #9063

[github-actions]

Fusion Gateway Performance Results

Simple Composite Query

	Req/s	Err%
Constant (50 VUs)	2941.30	0.00%
Ramping (0-500-0 VUs)	3154.91	0.00%

Response Times & Query

	Min	Med	Avg	P90	P95	Max
Constant	0.78ms	14.82ms	16.78ms	30.80ms	36.08ms	171.90ms
Ramping	0.77ms	69.99ms	70.66ms	132.31ms	148.19ms	270.47ms

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)	734.88	0.00%
Ramping (0-500-0 VUs)	824.20	0.00%

Response Times & Query

	Min	Med	Avg	P90	P95	Max
Constant	9.06ms	62.78ms	66.45ms	81.58ms	90.52ms	340.53ms
Ramping	1.82ms	256.88ms	260.68ms	511.52ms	545.01ms	686.24ms

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)	23604.17	0.00%
Ramping (0-500-0 VUs)	18679.02	0.00%

Response Times & Query

	Min	Med	Avg	P90	P95	Max
Constant	0.10ms	1.71ms	2.07ms	3.95ms	4.82ms	49.00ms
Ramping	0.10ms	9.34ms	11.32ms	23.29ms	28.15ms	103.20ms

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 22230162680 • Commit e586136 • Fri, 20 Feb 2026 15:50:13 GMT