SDK retrieves skipped documents for a targeted multi-partition query on a sub-partitioned container when the query targets only one physical partition and ODE is enabled

[alesk-kontent]

Describe the bug

When I run a targeted multi-partition query with the OFFSET LIMIT clause on a sub-partitioned container, the SDK retrieves skipped documents if the following conditions are met:

• The query options include the first part of the partition key.
• The query targets only one physical partition.
• ODE is enabled.

To reproduce

I wrote a console application to reproduce the issue. Please download the solution, open the Program.cs file and specify a connection string to an Azure Cosmos DB for NoSQL account. The application creates a new database with a container Subpartitioned. It also upserts random data, runs a query (with and without a partition key in the request options) and displays relevant information. You can run the application several times; it will only create resources and upsert data once.

The container contains 1,500 documents (articles) with the following properties:

Id : string
CustomerId : Guid
Label : string
Title : string

The value of the Id property is a random GUID. The value of the CustomerId and Label properties is always the same. The value of the Title property is unique for each document.

The indexing policy is automatic and consistent. As for the partition key, it has two components, customerId and id, so there are 1,500 logical partitions with one document. The maximum throughput is 20,000 RU/s so the container has two physical partitions, one of which is empty.

The query is SELECT * FROM c WHERE c.customerId = @customerId ORDER BY c.title OFFSET 1000 LIMIT 500 and the application runs it twice:

• Request options contain a partition key with the customer id.
• Request options do not contain a partition key.

I can see the following results:

Container: Subpartitioned
Partition key: ["df165b31-7641-4664-9549-37862ed806ee"]
Request charge: 47,65
Retrieved documents: 1500

Container: Subpartitioned
Partition key:
Request charge: 14,71
Retrieved documents: 500

Expected behavior

As the query only targets one physical partition, the request charge should be the same and with ODE enabled, the SDK should only retrieve 500 documents.

Actual behavior

With a partition key in the request options, the SDK will also retrieve the skipped documents.

Environment summary

SDK Version: 3.46.0
OS Version: Windows 11 Enterprise (10.0.22631 Build 22631)

Additional context

It happens in both Direct and Gateway mode.