test: add tests for partitioned queries to the .NET wrapper

[olavloite]

Adds a test to verify that partitioned queries work in the .NET wrapper.

[gemini-code-assist]

Summary of Changes

Hello @olavloite, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces the necessary infrastructure and testing to support partitioned queries within the .NET wrapper for SpannerLib. It extends the mock server to simulate the partitioning process and adapts its query execution to handle partition-specific tokens. A new, robust test case has been added to ensure that the .NET wrapper correctly processes and aggregates results from these partitioned queries, verifying the feature's functionality.

Highlights

• Mock Spanner Server Update: The MockSpannerServer now includes an implementation for the PartitionQuery method, which simulates the creation of query partitions. This method generates a specified or random number of partitions, each with a unique token, and integrates with existing session and transaction management.
• Partitioned Query Execution Logic: The PrepareExecuteSql method within the mock server has been enhanced to correctly identify and retrieve statement results for individual query partitions. It now prioritizes using the PartitionToken from the request for result lookup, falling back to the SQL query string if no token is present.
• New Test for Partitioned Queries: A comprehensive test method, TestPartitionedQuery, has been added to RowsTests.cs. This test validates the end-to-end functionality of partitioned queries in the .NET wrapper by setting up mock data, distributing rows across simulated partitions, executing a partitioned query, and asserting that the total number of rows returned matches the expected count.

Changelog

• spannerlib/wrappers/spannerlib-dotnet/spannerlib-dotnet-mockserver/MockSpannerServer.cs
  • Added PartitionQuery method to simulate query partitioning and token generation.
  • Modified PrepareExecuteSql to use PartitionToken for statement result lookup, enabling support for partitioned query execution.
• spannerlib/wrappers/spannerlib-dotnet/spannerlib-dotnet-tests/RowsTests.cs
  • Added TestPartitionedQuery to verify the functionality of partitioned queries in the .NET wrapper, including mock data setup and result aggregation.

Activity

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[gemini-code-assist]

Code Review

This pull request adds support and tests for partitioned queries to the .NET wrapper. The changes include implementing PartitionQuery in the mock server and adding a corresponding integration test. The implementation looks solid and the test effectively covers the new functionality. I have one suggestion to improve the test data generation to be more random and less biased.

[bhatt4982]

LGTM...