Handle NewArrayExpression in entity equality

src/EFCore/Query/Internal/EntityEqualityRewritingExpressionVisitor.cs

@@ -127,6 +127,11 @@ protected override Expression VisitMemberInit(MemberInitExpression memberInitExp
             }
         }
 
+        // Note that we could bubble up entity type information from the expressions initializing the array. However, EF Core doesn't
+        // actually support doing much further with this array, so it's not worth the complexity (right now). So we simply unwrap.
+        protected override Expression VisitNewArray(NewArrayExpression newArrayExpression)
+            => newArrayExpression.Update(Visit(newArrayExpression.Expressions).Select(Unwrap));
+
         protected override Expression VisitMember(MemberExpression memberExpression)
         {
             var visitedExpression = base.Visit(memberExpression.Expression);

test/EFCore.Cosmos.FunctionalTests/Query/SimpleQueryCosmosTest.Select.cs

@@ -83,6 +83,29 @@ FROM root c
 WHERE ((c[""Discriminator""] = ""Employee"") AND (c[""EmployeeID""] = 1))");
         }
 
+        [ConditionalTheory(Skip = "Issue#17246")]
+        public override async Task Projection_of_entity_type_into_object_array(bool isAsync)
+        {
+            await base.Projection_of_entity_type_into_object_array(isAsync);
+
+            AssertSql(
+                @"SELECT c[""CustomerID""], c[""Address""], c[""City""], c[""CompanyName""], c[""ContactName""], c[""ContactTitle""], c[""Country""], c[""Fax""], c[""Phone""], c[""PostalCode""], c[""Region""]
+FROM root c
+WHERE ((c[""Discriminator""] = ""Employee"") AND c[""CustomerID""] LIKE N'A%'
+ORDER BY c[""CustomerID""]");
+        }
+
+        [ConditionalTheory(Skip = "Issue#17246")]
+        public override async Task Projection_of_multiple_entity_types_into_object_array(bool isAsync)
+        {
+            await base.Projection_of_multiple_entity_types_into_object_array(isAsync);
+
+            AssertSql(
+                @"SELECT c
+FROM root c
+WHERE (c[""Discriminator""] = ""Customer"")");
+        }
+
         public override async Task Project_to_int_array(bool isAsync)
         {
             await base.Project_to_int_array(isAsync);

test/EFCore.Specification.Tests/Query/SimpleQueryTestBase.Select.cs

@@ -66,6 +66,30 @@ public virtual Task Project_to_object_array(bool isAsync)
                 elementAsserter: (e, a) => AssertArrays(e, a, 3));
         }
 
+        [ConditionalTheory]
+        [MemberData(nameof(IsAsyncData))]
+        public virtual Task Projection_of_entity_type_into_object_array(bool isAsync)
+        {
+            return AssertQuery(
+                isAsync,
+                ss => ss.Set<Customer>().OrderBy(c => c.CustomerID).Where(c => c.CustomerID.StartsWith("A"))
+                    .Select(c => new object[] { c }),
+                entryCount: 4,
+                assertOrder: true);
+        }
+
+        [ConditionalTheory]
+        [MemberData(nameof(IsAsyncData))]
+        public virtual Task Projection_of_multiple_entity_types_into_object_array(bool isAsync)
+        {
+            return AssertQuery(
+                isAsync,
+                ss => ss.Set<Order>().OrderBy(o => o.OrderID).Where(o => o.OrderID < 10300)
+                    .Select(o => new object[] { o, o.Customer }),
+                entryCount: 87,
+                assertOrder: true);
+        }
+
         [ConditionalTheory]
         [MemberData(nameof(IsAsyncData))]
         public virtual Task Project_to_int_array(bool isAsync)

test/EFCore.SqlServer.FunctionalTests/Query/SimpleQuerySqlServerTest.Select.cs

@@ -79,6 +79,29 @@ FROM [Employees] AS [e]
 WHERE [e].[EmployeeID] = 1");
         }
 
+        public override async Task Projection_of_entity_type_into_object_array(bool isAsync)
+        {
+            await base.Projection_of_entity_type_into_object_array(isAsync);
+
+            AssertSql(
+                @"SELECT [c].[CustomerID], [c].[Address], [c].[City], [c].[CompanyName], [c].[ContactName], [c].[ContactTitle], [c].[Country], [c].[Fax], [c].[Phone], [c].[PostalCode], [c].[Region]
+FROM [Customers] AS [c]
+WHERE [c].[CustomerID] LIKE N'A%'
+ORDER BY [c].[CustomerID]");
+        }
+
+        public override async Task Projection_of_multiple_entity_types_into_object_array(bool isAsync)
+        {
+            await base.Projection_of_multiple_entity_types_into_object_array(isAsync);
+
+            AssertSql(
+                @"SELECT [o].[OrderID], [o].[CustomerID], [o].[EmployeeID], [o].[OrderDate], [c].[CustomerID], [c].[Address], [c].[City], [c].[CompanyName], [c].[ContactName], [c].[ContactTitle], [c].[Country], [c].[Fax], [c].[Phone], [c].[PostalCode], [c].[Region]
+FROM [Orders] AS [o]
+LEFT JOIN [Customers] AS [c] ON [o].[CustomerID] = [c].[CustomerID]
+WHERE [o].[OrderID] < 10300
+ORDER BY [o].[OrderID]");
+        }
+
         public override async Task Project_to_int_array(bool isAsync)
         {
             await base.Project_to_int_array(isAsync);