[Copilot]

Fixes #38615

Description
At compatibility level 170, EF Core generates JSON collection queries using syntax unsupported by Azure SQL, causing SQL error 13618. The fix uses nvarchar(max) for nested JSON fragments while preserving SQL Server 2025 behavior.

Customer impact
Queries over nested JSON collections fail instead of returning results, breaking affected application workflows. Workaround: configure EF’s Azure SQL provider with UseCompatibilityLevel(160), but this can result it degraded performance.

How found
Reported on EF Core 10.0.9 by 3 customers.

Regression
No. Native JSON and JSON-mapped complex collections were introduced in EF Core 10.

Testing
Test added

Risk
Medium. The product change is small and localized, but changing intermediate JSON fragments to text affects downstream operations.

[Copilot]

Pull request overview

This PR adjusts SQL Server JSON query SQL generation to avoid an Azure SQL limitation at compatibility level 170: OPENJSON ... WITH (...) columns using AS JSON cannot use the native json type on Azure SQL, so EF Core now emits nvarchar(max) for that specific case unless the server is on-prem SQL Server 2025+.

Changes:

• Introduces SupportsJsonTypeInOpenJson on ISqlServerSingletonOptions/SqlServerSingletonOptions to distinguish on-prem SQL Server support from Azure SQL.
• Updates SqlServerQuerySqlGenerator to substitute nvarchar(max) for json-typed OPENJSON WITH columns when AS JSON is used and the server doesn’t support json in that position.
• Adds a regression test covering nested primitive collections within complex collections inside a JSON column, with baselines for both nvarchar(max) and json column types.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/EFCore.SqlServer.FunctionalTests/Query/AdHocJsonQuerySqlServerTestBase.cs	Adds SQL assertions for the new regression scenario across JSON column type variants.
test/EFCore.Relational.Specification.Tests/Query/AdHocJsonQueryRelationalTestBase.cs	Adds provider-agnostic regression test scenario/model and verifies results.
src/EFCore.SqlServer/Query/Internal/SqlServerQuerySqlGenerator.cs	Emits nvarchar(max) instead of json for OPENJSON ... WITH columns using AS JSON where required (Azure SQL).
src/EFCore.SqlServer/Infrastructure/Internal/SqlServerSingletonOptions.cs	Implements the new capability flag based on engine type/compatibility level.
src/EFCore.SqlServer/Infrastructure/Internal/ISqlServerSingletonOptions.cs	Adds the new capability flag to the singleton options contract.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.