Handle primitive collections as multiple parameters.

[cincuranet]

Contributes to #36101.
Closes #34347.

[Copilot]

Pull Request Overview

This PR extends EF Core to support translating primitive collections into multiple SQL parameters instead of a single parameter or JSON, driven by a new ParameterizedCollectionTranslationMode.

• Changed parameter value storage and method signatures from IReadOnlyDictionary<string, object?> to mutable Dictionary<string, object?>.
• Introduced ParameterizedCollectionTranslationMode enum and threaded it through SQL processors, visitors, and the DbContext options builder.
• Updated SQL generation in SQLite for multi-row VALUES (wrapping in a sub-SELECT) and enhanced JSON/OPENJSON logic for SQL Server.

Reviewed Changes

Copilot reviewed 65 out of 65 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/EFCore/Query/Internal/IParameterValues.cs	Changed interface property to return mutable Dictionary.
src/EFCore/Query/Internal/NavigationExpandingExpressionVisitor.cs	Updated Parameters.ParameterValues to Dictionary.
src/EFCore.Sqlite.Core/Query/Internal/SqliteQueryableMethodTranslatingExpressionVisitor.cs	Added TryTranslate helper and new JSON index translation.
src/EFCore.Sqlite.Core/Query/Internal/SqliteQuerySqlGenerator.cs	Wrapped multi-row VALUES in SELECT * FROM (…).
src/EFCore.Relational/Internal/ParameterizedCollectionTranslationMode.cs	Added new enum member ParameterizeExpanded.
src/EFCore.Relational/Infrastructure/RelationalDbContextOptionsBuilder.cs	Added TranslateParameterizedCollectionsToExpandedParameters option.
Multiple files across SqlNullabilityProcessor, SQL Server/SQLite processors and factories	Threaded new mode through constructors and method signatures.

Comments suppressed due to low confidence (2)

src/EFCore.Relational/Query/SqlNullabilityProcessor.cs:123

• [nitpick] This VisitExtension override now handles multiple translation modes with nested logic; consider extracting each mode case into its own helper method to improve readability and reduce method complexity.

protected override Expression VisitExtension(Expression node)

src/EFCore.Relational/Infrastructure/RelationalDbContextOptionsBuilder.cs:226

• New builder option for expanded parameters was added; ensure there are unit or integration tests covering this mode to verify correct SQL translation.

public virtual TBuilder TranslateParameterizedCollectionsToExpandedParameters()

[roji]

Great to see this, thanks @cincuranet. Let's iterate and get it to the finish line.

Of course OK to split things out to later PRs, we can discusss.

[roji]

Looks really close now, see essentially nits and doc comments.

[cincuranet]

FYI the Helix failure is (at the moment) expected. It depends on #36228.

[roji]

Looks great, job well done @cincuranet. See remaining batch of really minor nits, feel free to merge after fixing without an additional review.