Perf: AddressResolver.TryResolveServerPartitionAsync triggers JSON deserialization on PartitionKeyRange.Id per request

[kirankumarkolli]

Parent issue: #5747

Problem

AddressResolver.TryResolveServerPartitionAsync() (src/Routing/AddressResolver.cs:497-510) accesses PartitionKeyRange.Id 3 times during address resolution. Since Id inherits from Resource JsonSerializable, each access triggers JToken.ToObject<T>(). This method is called on every single request as part of core routing.

Hot path assessment: HOT

Every SDK operation goes through ResolveAsync() TryResolveServerPartitionAsync(). This is the most frequently executed code path in the SDK.

Suggested fix

Cache range.Id in a local variable at the top of the method before the 3 usages at lines 497, 501, and 510.

Lines

• AddressResolver.cs:497 routingMap.TryGetInfoByPartitionKeyRangeId(range.Id)
• AddressResolver.cs:501 new PartitionKeyRangeIdentity(collection.ResourceId, range.Id)
• AddressResolver.cs:510 new PartitionKeyRangeIdentity(collection.ResourceId, range.Id)

Constraint

PartitionKeyRange is in compiled NuGet (Microsoft.Azure.Cosmos.Direct) fix must be at the call site.