[Copilot]

Query precompilation rejects legal decimal projections such as group.Balance + (amount > 0 ? amount : 0): it passes a boxed integer literal with a decimal target type to Expression.Constant.

• Translation: Convert numeric literal values to their semantic target type before constructing constants, preserving null and nonnumeric handling.
• Coverage: Add implicit-zero and explicit-decimal control cases, widening/narrowing and character conversions, and projection generation with managed compilation on SQLite and SQL Server. Generated-query execution and NativeAOT publication remain outside this coverage.

• Fixes Query precompiler rejects an integer zero implicitly converted to decimal in a projection #39303

[github-actions]

Agent harness evaluation deferred

This PR affects: query-pipeline. Automatic evaluation is deferred because this PR is currently marked as draft. Once it is ready for review, the usual author authorization rules apply. A contributor with write access can comment /eval or /eval component-name, or run the workflow manually for pull request #39312.

[Copilot]

🟢 Approval recommended

The focused conversion fix and regression coverage match the stated scope, with no identified blocking issues.

No open issues 🎉

What changed in this PR

Fixes #39303 by converting numeric literal values to their semantic target types before constructing query-precompilation constants.

Changes:

• Handles implicit numeric conversions while preserving null and nonnumeric handling.
• Adds translator regressions and decimal projection generation/managed-compilation coverage.
• Documents validation without query execution or NativeAOT publication.

File	Description
test/​EFCore.SqlServer.FunctionalTests/​Query/​AdHocPrecompiledQuerySqlServerTest.cs	Adds the provider override with an empty SQL assertion.
test/​EFCore.Relational.Specification.Tests/​Query/​AdHocPrecompiledQueryRelationalTestBase.cs	Adds the decimal projection compilation regression.
test/​EFCore.Design.Tests/​Query/​CSharpToLinqTranslatorTest.cs	Covers decimal, character, widening, and narrowing conversions.
src/​EFCore.Design/​Query/​Internal/​CSharpToLinqTranslator.cs	Converts numeric values before constructing typed constants.
.agents/​skills/​query-pipeline/​SKILL.md	Documents generation-only validation boundaries.

_{Review effort: Balanced}

[Copilot]

🟢 Approval recommended

Static review identified no blocking defects in the localized fix or scoped regression coverage; tests were not run.

No open issues 🎉

_{Review effort: Balanced}

[github-code-quality]

Code coverage overview

Languages: C#

C# / code-coverage

main ed0b576	copilot/fix-decimal-... 25e712e	+/-
76%	76%	0%

View coverage of the 10 most impacted files.

File	main ed0b576	copilot/fix-decimal-... 25e712e	+/-
src/Microsoft.D...qliteCommand.cs	95%	92%	-3%
src/Shared/NonC...yInitializer.cs	12%	11%	-1%
src/Shared/Shar...peExtensions.cs	23%	23%	0%
src/EFCore.Desi...nqTranslator.cs	84%	84%	0%
src/EFCore.Abst...erExtensions.cs	100%	100%	0%
src/EFCore.Cosm...nsExtensions.cs	82%	82%	0%
src/EFCore.Desi...onExtensions.cs	100%	100%	0%
src/EFCore.Desi...viderFactory.cs	95%	95%	0%
src/EFCore.Desi...CSharpHelper.cs	96%	96%	0%
src/EFCore.Desi...eportHandler.cs	47%	47%	0%

ℹ️ Calculations represent line coverage. Results may change as calculations are updated.

---

_{Updated October 31, 2026 00:16 UTC}

[Copilot]

🟢 Approval recommended

No active review issues remain for the numeric-literal conversion fix.

No open issues 🎉

_{Review effort: Balanced}