Test for #9742

src/EFCore.Relational/Query/QuerySqlGenerator.cs

@@ -3,7 +3,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.Linq;
 using System.Linq.Expressions;
 using Microsoft.EntityFrameworkCore.Query.SqlExpressions;

src/EFCore.SqlServer/Query/Internal/SqlServerQuerySqlGenerator.cs

@@ -4,7 +4,6 @@
 using System.Linq.Expressions;
 using Microsoft.EntityFrameworkCore.Query;
 using Microsoft.EntityFrameworkCore.Query.SqlExpressions;
-using Microsoft.EntityFrameworkCore.Storage;
 
 namespace Microsoft.EntityFrameworkCore.SqlServer.Query.Internal
 {

test/EFCore.Relational.Tests/TestUtilities/FakeDiagnosticsLogger.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Diagnostics;
 using Microsoft.EntityFrameworkCore.Diagnostics;
-using Microsoft.EntityFrameworkCore.Diagnostics.Internal;
 using Microsoft.EntityFrameworkCore.Internal;
 using Microsoft.Extensions.Logging;
 

test/EFCore.Specification.Tests/Query/IncludeTestBase.cs

@@ -11,7 +11,6 @@
 using Microsoft.EntityFrameworkCore.Internal;
 using Microsoft.EntityFrameworkCore.TestModels.Northwind;
 using Microsoft.EntityFrameworkCore.TestUtilities;
-using Microsoft.EntityFrameworkCore.TestUtilities.Xunit;
 using Xunit;
 
 // ReSharper disable InconsistentNaming
@@ -3192,6 +3191,41 @@ var customers
             }
         }
 
+        [ConditionalTheory]
+        [InlineData(false)]
+        [InlineData(true)]
+        public virtual void Include_collection_with_multiple_conditional_order_by(bool useString)
+        {
+            using (var context = CreateContext())
+            {
+                var orders
+                    = useString
+                        ? context.Orders
+                            .Include("OrderDetails")
+                            .OrderBy(o => o.OrderID > 0)
+                            .ThenBy(o => o.Customer != null ? o.Customer.City : String.Empty)
+                            .Take(5)
+                            .ToList()
+                        : context.Orders
+                            .Include(c => c.OrderDetails)
+                            .OrderBy(o => o.OrderID > 0)
+                            .ThenBy(o => o.Customer != null ? o.Customer.City : String.Empty)
+                            .Take(5)
+                            .ToList();
+
+                foreach (var order in orders)
+                {
+                    CheckIsLoaded(
+                        context,
+                        order,
+                        orderDetailsLoaded: true,
+                        productLoaded: false,
+                        customerLoaded: false,
+                        ordersLoaded: false);
+                }
+            }
+        }
+
         [ConditionalTheory]
         [InlineData(false)]
         [InlineData(true)]

test/EFCore.SqlServer.FunctionalTests/Query/IncludeSqlServerTest.cs

@@ -1011,6 +1011,36 @@ OFFSET @__p_0 ROWS
             }
         }
 
+        public override void Include_collection_with_multiple_conditional_order_by(bool useString)
+        {
+            base.Include_collection_with_multiple_conditional_order_by(useString);
+
+            AssertSql(
+                @"@__p_0='5'
+
+SELECT [t].[OrderID], [t].[CustomerID], [t].[EmployeeID], [t].[OrderDate], [o0].[OrderID], [o0].[ProductID], [o0].[Discount], [o0].[Quantity], [o0].[UnitPrice]
+FROM (
+    SELECT TOP(@__p_0) [o].[OrderID], [o].[CustomerID], [o].[EmployeeID], [o].[OrderDate], CASE
+        WHEN [o].[OrderID] > 0 THEN CAST(1 AS bit)
+        ELSE CAST(0 AS bit)
+    END AS [c], CASE
+        WHEN [c].[CustomerID] IS NOT NULL THEN [c].[City]
+        ELSE N''
+    END AS [c0]
+    FROM [Orders] AS [o]
+    LEFT JOIN [Customers] AS [c] ON [o].[CustomerID] = [c].[CustomerID]
+    ORDER BY CASE
+        WHEN [o].[OrderID] > 0 THEN CAST(1 AS bit)
+        ELSE CAST(0 AS bit)
+    END, CASE
+        WHEN [c].[CustomerID] IS NOT NULL THEN [c].[City]
+        ELSE N''
+    END
+) AS [t]
+LEFT JOIN [Order Details] AS [o0] ON [t].[OrderID] = [o0].[OrderID]
+ORDER BY [t].[c], [t].[c0], [t].[OrderID], [o0].[OrderID], [o0].[ProductID]");
+        }
+
         public override void Then_include_collection_order_by_collection_column(bool useString)
         {
             base.Then_include_collection_order_by_collection_column(useString);