Add regression test for count after client eval

All.sln.DotSettings

@@ -192,6 +192,7 @@ Licensed under the Apache License, Version 2.0. See License.txt in the project r
 	<s:Boolean x:Key="/Default/Environment/InjectedLayers/InjectedLayerCustomization/=FileEF4F00E20178B341995BD2EFE53739B5/@KeyIndexDefined">True</s:Boolean>
 	<s:Double x:Key="/Default/Environment/InjectedLayers/InjectedLayerCustomization/=FileEF4F00E20178B341995BD2EFE53739B5/RelativePriority/@EntryValue">2</s:Double>
 	<s:String x:Key="/Default/Environment/PerformanceGuide/SwitchBehaviour/=VsBulb/@EntryIndexedValue">DO_NOTHING</s:String>
+	<s:Boolean x:Key="/Default/Environment/SettingsMigration/IsMigratorApplied/=JetBrains_002EReSharper_002EFeature_002EServices_002EDaemon_002ESettings_002EMigration_002ESwaWarningsModeSettingsMigrate/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/Environment/SettingsMigration/IsMigratorApplied/=JetBrains_002EReSharper_002EPsi_002ECSharp_002ECodeStyle_002ECSharpAttributeForSingleLineMethodUpgrade/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/Environment/SettingsMigration/IsMigratorApplied/=JetBrains_002EReSharper_002EPsi_002ECSharp_002ECodeStyle_002ECSharpKeepExistingMigration/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/Environment/SettingsMigration/IsMigratorApplied/=JetBrains_002EReSharper_002EPsi_002ECSharp_002ECodeStyle_002ECSharpPlaceAttributeOnSameLineMigration/@EntryIndexedValue">True</s:Boolean>

test/EFCore.Cosmos.FunctionalTests/Query/NorthwindAggregateOperatorsQueryCosmosTest.cs

@@ -752,6 +752,15 @@ public override async Task Average_on_nav_subquery_in_projection(bool isAsync)
                 @"");
         }
 
+        [ConditionalTheory(Skip = "Issue#16146")]
+        public override async Task Count_after_client_projection(bool isAsync)
+        {
+            await base.Count_after_client_projection(isAsync);
+
+            AssertSql(
+                @"");
+        }
+
         [ConditionalTheory(Skip = "Issue#17246")]
         public override async Task OrderBy_client_Take(bool async)
         {

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

@@ -2009,5 +2009,20 @@ public virtual Task Average_on_nav_subquery_in_projection(bool isAsync)
                     }
                 });
         }
+
+        [ConditionalTheory]
+        [MemberData(nameof(IsAsyncData))]
+        public virtual Task Count_after_client_projection(bool isAsync)
+        {
+            return AssertCount(
+                isAsync,
+                ss => ss.Set<Order>()
+                    .Select(o => new
+                    {
+                        o.OrderID,
+                        Customer = o.Customer is Customer ? new { o.Customer.ContactName } : null
+                    })
+                    .Take(1));
+        }
     }
 }

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

@@ -1479,6 +1479,20 @@ FROM [Customers] AS [c]
 ORDER BY [c].[CustomerID]");
         }
 
+        public override async Task Count_after_client_projection(bool isAsync)
+        {
+            await base.Count_after_client_projection(isAsync);
+
+            AssertSql(
+                @"@__p_0='1'
+
+SELECT COUNT(*)
+FROM (
+    SELECT TOP(@__p_0) [o].[OrderID], [o].[CustomerID], [o].[EmployeeID], [o].[OrderDate]
+    FROM [Orders] AS [o]
+) AS [t]");
+        }
+
         private void AssertSql(params string[] expected)
             => Fixture.TestSqlLoggerFactory.AssertBaseline(expected);