Missing ORDER BY

Include your code

[Table("Table_1")]
public partial class Table1
{
    [Key]
    public int Id { get; set; }

    public DateTime CreateTime { get; set; }
}

public partial class TestContext : DbContext
{
    public TestContext()
    {
    }

    public TestContext(DbContextOptions<TestContext> options)
        : base(options)
    {
    }

    public virtual DbSet<Table1> Table1 { get; set; }
}

var services = new ServiceCollection();
services.AddDbContext<TestContext>();
var serviceProvider = services.BuildServiceProvider();

var testContext = serviceProvider.GetRequiredService<TestContext>();
var sql = testContext.Table1.OrderBy(a => a.Id).Distinct().ToQueryString();
Console.WriteLine(sql);

Expected Behavior

SELECT DISTINCT [t].[Id], [t].[CreateTime]
FROM [Table_1] AS [t]
ORDER BY [t].[Id]

Actual Behavior

SELECT DISTINCT [t].[Id], [t].[CreateTime]
FROM [Table_1] AS [t]

Include provider and version information

EF Core version:6.0.0-preview.7.21378.4 Database provider: Microsoft.EntityFrameworkCore.SqlServer Target framework: .NET 6.0 Operating system:Win11 IDE: Visual Studio 2022 17.0

[ajcvickers]

A a very simple example where items are not returned in the order they are inserted:

var hashSet = new HashSet<int>();
for (var i = 0; i < 10; i++)
{
    hashSet.Add(i);
}

hashSet.Remove(2);
hashSet.Add(1000);

foreach (var i in hashSet)
{
    Console.WriteLine(i);
}

C:/local/AllTogetherNow/FiveOh/bin/Debug/net5.0/FiveOh.exe
0
1
1000
3
4
5
6
7
8
9

[Varorbc]

https://docs.microsoft.com/en-us/ef/core/what-is-new/ef-core-6.0/whatsnew#distinct-queries

@roji @ajcvickers why are there different behaviors on different database providers?