Cosmos: Complex properties binding

[JoasE]

Adds a CosmosStructuralTypeMaterializerSource and overrides AddStructuralTypeInitialization in CosmosShapedQueryCompilingExpressionVisitor to generate materialization expressions for complex properties
Leverages Nullable<>.HasValue for nullable value types in to support value types without equals operator
Part of: #31253

[Copilot]

Pull request overview

This pull request implements binding logic for complex properties in the Cosmos DB provider, enabling proper materialization of complex types from JSON documents. The implementation introduces a custom CosmosStructuralTypeMaterializerSource that defers complex property handling to allow nested materialization expressions to be generated during query compilation.

Key changes:

• Introduces CosmosStructuralTypeMaterializerSource to control when complex properties are materialized during shaping
• Implements nested complex property and collection binding in CosmosShapedQueryCompilingExpressionVisitor
• Enhances null-handling logic in CosmosProjectionBindingExpressionVisitor for nullable value types

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 13 comments.

Show a summary per file

File	Description
src/EFCore.Cosmos/Query/Internal/CosmosStructuralTypeMaterializerSource.cs	New class that overrides complex type materialization behavior to enable deferred binding
src/EFCore.Cosmos/Query/Internal/CosmosShapedQueryCompilingExpressionVisitor.cs	Adds logic to generate materialization expressions for complex properties and collections from JObject/JArray
src/EFCore.Cosmos/Query/Internal/CosmosShapedQueryCompilingExpressionVisitor.CosmosProjectionBindingRemovingExpressionVisitorBase.cs	Exposes methods and fields needed for complex property binding; adds handling for ComplexPropertyBindingExpression
src/EFCore.Cosmos/Query/Internal/CosmosProjectionBindingExpressionVisitor.cs	Improves null-safety checks for nullable value types and refactors member expression updates
src/EFCore.Cosmos/Extensions/CosmosServiceCollectionExtensions.cs	Registers the new CosmosStructuralTypeMaterializerSource service
test/EFCore.Cosmos.FunctionalTests/CosmosComplexTypesTrackingTest.cs	Uncomments assertions that now pass with complex property binding implemented
test/EFCore.Cosmos.FunctionalTests/Query/Associations/ComplexProperties/ComplexPropertiesProjectionCosmosTest.cs	New test class with Cosmos-specific overrides for complex property projection tests
test/EFCore.Cosmos.FunctionalTests/Query/Associations/ComplexProperties/ComplexPropertiesCosmosFixture.cs	Test fixture configuration for complex properties tests in Cosmos

[Copilot]

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 4 comments.

[Copilot]

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated no new comments.