Add regression test for #19138

Author: smitpatel

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

@@ -1269,7 +1269,7 @@ join eRoot in ctx.Entities.Include(e => e.Children)
                                 on eVersion.RootEntityId equals eRoot.Id
                                 into RootEntities
                             from eRootJoined in RootEntities.DefaultIfEmpty()
-                            // ReSharper disable once ConstantNullCoalescingCondition
+                                // ReSharper disable once ConstantNullCoalescingCondition
                             select new { One = 1, Coalesce = eRootJoined ?? (eVersion ?? eRootJoined) };
 
                 var result = query.ToList();
@@ -1288,7 +1288,7 @@ join eRoot in ctx.Entities
                                 on eVersion.RootEntityId equals eRoot.Id
                                 into RootEntities
                             from eRootJoined in RootEntities.DefaultIfEmpty()
-                            // ReSharper disable once ConstantNullCoalescingCondition
+                                // ReSharper disable once ConstantNullCoalescingCondition
                             select new
                             {
                                 One = eRootJoined,
@@ -1312,7 +1312,7 @@ join eRoot in ctx.Entities
                                 on eVersion.RootEntityId equals eRoot.Id
                                 into RootEntities
                             from eRootJoined in RootEntities.DefaultIfEmpty()
-                            // ReSharper disable once MergeConditionalExpression
+                                // ReSharper disable once MergeConditionalExpression
 #pragma warning disable IDE0029 // Use coalesce expression
                             select eRootJoined != null ? eRootJoined : eVersion;
 #pragma warning restore IDE0029 // Use coalesce expression
@@ -6862,6 +6862,75 @@ public BugContext18759(DbContextOptions options)
 
         #endregion
 
+        #region Issue19138
+
+        [ConditionalFact]
+        public void Accessing_scalar_property_in_derived_type_projection_does_not_load_owned_navigations()
+        {
+            using var _ = CreateDatabase19138();
+            using var context = new BugContext19138(_options);
+
+            var result = context.BaseEntities
+                .Select(b => context.OtherEntities.Where(o => o.OtherEntityData == ((SubEntity19138)b).Data).FirstOrDefault())
+                .ToList();
+
+            AssertSql(
+                @"SELECT [p].[Id], [p].[UserDeleteId]
+FROM [People] AS [p]
+LEFT JOIN [User19138] AS [u] ON [p].[UserDeleteId] = [u].[Id]
+WHERE [u].[Id] IS NOT NULL");
+        }
+
+        private SqlServerTestStore CreateDatabase19138()
+            => CreateTestStore(
+                () => new BugContext19138(_options),
+                context =>
+                {
+                    ClearLog();
+                });
+
+        private class BaseEntity19138
+        {
+            public int Id { get; set; }
+        }
+
+        private class SubEntity19138 : BaseEntity19138
+        {
+            public string Data { get; set; }
+            public Owned19138 Owned { get; set; }
+        }
+
+        private class Owned19138
+        {
+            public string OwnedData { get; set; }
+        }
+
+        private class OtherEntity19138
+        {
+            public string Id { get; set; }
+            public string OtherEntityData { get; set; }
+        }
+
+        private class BugContext19138 : DbContext
+        {
+            public DbSet<BaseEntity19138> BaseEntities { get; set; }
+            public DbSet<OtherEntity19138> OtherEntities { get; set; }
+
+            protected override void OnModelCreating(ModelBuilder modelBuilder)
+            {
+                modelBuilder.Entity<BaseEntity19138>();
+                modelBuilder.Entity<SubEntity19138>().OwnsOne(se => se.Owned);
+                modelBuilder.Entity<OtherEntity19138>();
+            }
+
+            public BugContext19138(DbContextOptions options)
+                : base(options)
+            {
+            }
+        }
+
+        #endregion
+
         private DbContextOptions _options;
 
         private SqlServerTestStore CreateTestStore<TContext>(