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).

Also includes some general improvements to how we handle JSON type mappings and literals.

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.

[Copilot]

Pull request overview

Copilot reviewed 18 out of 18 changed files in this pull request and generated 6 comments.

[Copilot]

Pull request overview

Copilot reviewed 19 out of 19 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 19 out of 19 changed files in this pull request and generated no new comments.