Implement partial property loading in relational query

[roji]

Closes #37279

[Copilot]

Pull request overview

This PR implements partial property loading for the relational query pipeline (#37279), the first step toward supporting "stop loading vector properties" optimization. Non-auto-loaded properties (those with IsAutoLoaded = false) are now excluded from SQL SELECT projections and properly handled during materialization and change tracking. The primary use case is SQL Server vector properties (SqlVector<T>), which should not be fetched by default as they can be large.

Changes:

• Non-auto-loaded properties are excluded from SQL entity projections and post-construction materialization; shadow properties get their sentinel value instead of a value buffer read.
• A model validator is added to prevent constructor-bound properties from being configured as non-auto-loaded.
• The SqlServerAutoLoadConvention is fixed to also handle nullable vector types (SqlVector<float>?) by calling UnwrapNullableType() before checking for the SqlVector<> open generic.

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/EFCore.Relational/Query/SqlExpressions/SelectExpression.cs	Skips non-auto-loaded properties when building the entity projection into the SELECT list
src/EFCore/Query/Internal/StructuralTypeMaterializerSource.cs	Excludes non-auto-loaded properties from the set of properties assigned after construction
src/EFCore/Query/ShapedQueryCompilingExpressionVisitor.cs	Uses sentinel value for non-auto-loaded shadow properties instead of reading from value buffer
src/EFCore/Infrastructure/ModelValidator.cs	Adds validation that constructor-bound properties cannot be non-auto-loaded
src/EFCore/Properties/CoreStrings.resx	Adds AutoLoadedConstructorProperty error message resource (also in .Designer.cs)
src/EFCore.SqlServer/Metadata/Conventions/SqlServerAutoLoadConvention.cs	Bug fix: adds UnwrapNullableType() to correctly detect nullable SqlVector<T>? types
test/EFCore.Relational.Specification.Tests/Update/NonSharedModelUpdatesTestBase.cs	Adds new test cases for the not-auto-loaded query scenarios; updates existing assertions to reflect new behavior (Description/Tags not materialized)
test/EFCore.SqlServer.FunctionalTests/Update/NonSharedModelUpdatesSqlServerTest.cs	SQL baselines for new and updated test methods
test/EFCore.Tests/Infrastructure/ModelValidatorTest.cs	Unit test for the new constructor-bound validation
test/EFCore.SqlServer.FunctionalTests/Query/Translations/VectorTranslationsSqlServerTest.cs	Updated SQL baselines: vector column excluded from SELECT
test/EFCore.SqlServer.FunctionalTests/Scaffolding/CompiledModelSqlServerTest.cs	Asserts IsAutoLoaded=false on the vector property in the compiled model test
test/EFCore.SqlServer.FunctionalTests/Scaffolding/Baselines/Vector_index/VectorIndexEntityEntityType.cs	Compiled model baseline: adds autoLoaded: false to vector property registration

Files not reviewed (1)

• src/EFCore/Properties/CoreStrings.Designer.cs: Language not supported

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[roji]

/azp run

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[AndriySvyryd]

Move this to ValidateAutoLoaded since it's rare to have a non-autoloaded property

[AndriySvyryd]

Suggested change

	structuralType.GetProperties().Cast<IPropertyBase>().Where(p => !p.IsShadowProperty() && p is not IProperty { IsAutoLoaded: false })
	.Concat(structuralType.GetComplexProperties().Where(p => !p.IsShadowProperty())));
	structuralType.GetProperties().Where(p => !p.IsShadowProperty() && !p.IsAutoLoaded).Cast<IPropertyBase>()
	.Concat(structuralType.GetComplexProperties().Where(p => !p.IsShadowProperty())));