Avoid pushdown when applying OrderBy over Distinct
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 42/100
Research direction
Use the provided Distinct().OrderBy(...) query as the reproduction and compare its generated SQL with the two examples. Trace the EF Core query translation path for Distinct followed by OrderBy; done means the query avoids the derived-table pushdown and produces the simpler SQL shown in the issue.
Written by the indexing model from the issue text.
Description
This query:
_ = await ctx.Blogs.Distinct().OrderBy(a => a.Id).ToListAsync();
Currently produces:
SELECT [t].[Id], [t].[Name]
FROM (
SELECT DISTINCT [b].[Id], [b].[Name]
FROM [Blogs] AS [b]
) AS [t]
ORDER BY [t].[Id]
Whereas it could produce:
SELECT DISTINCT [b].[Id], [b].[Name]
FROM [Blogs] AS [b]
ORDER BY [b].[Id]
- Dominant language
- C#
- Stars
- 14.8k
- Forks
- 3.4k
- Avg merge
- 2d 5h
- Merged PRs (30d)
- 134
Contributor guide
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