Fix duplicate DbParameter naming uniquification#37430
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roji merged 1 commit intodotnet:mainfrom Jan 3, 2026
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Pull request overview
This PR fixes issue #37409 where duplicate DbParameter instances in a SQL tree were having their names uniquified multiple times, leading to incorrect parameter references. The issue occurs when SQL tree fragments are duplicated during query translation (e.g., in GroupBy operations).
Key Changes
- Added deduplication logic to track already-processed DbParameter instances using a dictionary keyed by DbParameter reference
- Refactored
ProcessDbParameterto returnRawRelationalParameterinstead of modifying the parameter in-place without returning a value - Added a test case demonstrating the GroupBy scenario that triggers SQL tree duplication
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
src/EFCore.Relational/Query/Internal/RelationalParameterProcessor.cs |
Added _processedDbParameters dictionary to cache processed DbParameters and prevent duplicate name uniquification; refactored ProcessDbParameter to return the created RawRelationalParameter |
test/EFCore.Relational.Specification.Tests/Query/FromSqlQueryTestBase.cs |
Added test FromSql_GroupBy_non_reducing_Select to verify the fix handles duplicated SQL tree fragments with DbParameters |
test/EFCore.SqlServer.FunctionalTests/Query/FromSqlQuerySqlServerTest.cs |
Added SQL baseline for the new test showing the same @city parameter correctly used twice in the generated SQL |
AndriySvyryd
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Fixes #37409