Implement JSON_CONTAINS() for primitive collections

[roji]

• Does not include Contains over structural types, only scalars.
• Does not support both nullable item and collections over nullable types because of limitations of JSON_CONTAINS() (which does not support searching NULL). For that case we retain the default OPENJSON translation.

Note: JSON_CONTAINS() is still in preview at the time of writing, but can offer some significant performance advantages (as it can take advantage of JSON indexes).

Closes #36656
Fixes #37561

[Copilot]

Pull request overview

This pull request implements JSON_CONTAINS() support for non-nullable primitive collections on SQL Server 2025+ (compatibility level 170+). The implementation translates Contains operations over non-nullable primitive collections to the more efficient JSON_CONTAINS function instead of the previous OPENJSON-based approach.

Changes:

• Adds JSON_CONTAINS support detection in infrastructure (SqlServerSingletonOptions, TestEnvironment)
• Implements TranslateContains override to use JSON_CONTAINS for non-nullable collections
• Adds null-handling logic in SqlServerSqlNullabilityProcessor for JSON_CONTAINS
• Fixes JsonScalarExpression handling for JSON constants/parameters with CAST to json type

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/EFCore.SqlServer/Infrastructure/Internal/ISqlServerSingletonOptions.cs	Adds SupportsJsonContains property to the interface
src/EFCore.SqlServer/Infrastructure/Internal/SqlServerSingletonOptions.cs	Implements SupportsJsonContains based on engine type and compatibility level
src/EFCore.SqlServer/Query/Internal/SqlServerQueryableMethodTranslatingExpressionVisitor.cs	Implements TranslateContains to use JSON_CONTAINS for non-nullable primitive collections
src/EFCore.SqlServer/Query/Internal/SqlServerSqlNullabilityProcessor.cs	Adds null-handling logic for JSON_CONTAINS function calls
src/EFCore.SqlServer/Query/Internal/SqlServerJsonPostprocessor.cs	Adds CAST to json for JsonScalarExpression over constants to support RETURNING clause
test/EFCore.SqlServer.FunctionalTests/TestUtilities/SqlServerCondition.cs	Adds SupportsJsonContains condition flag
test/EFCore.SqlServer.FunctionalTests/TestUtilities/SqlServerConditionAttribute.cs	Implements check for SupportsJsonContains condition
test/EFCore.SqlServer.FunctionalTests/TestUtilities/TestEnvironment.cs	Adds IsJsonContainsSupported property for test environment detection
test/EFCore.SqlServer.FunctionalTests/Query/PrimitiveCollectionsQuerySqlServerJsonTypeTest.cs	Updates test baselines for JSON_CONTAINS and removes explicit json column type configurations

[Copilot]

Pull request overview

Copilot reviewed 11 out of 11 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated no new comments.