Fixed Issue with abstract types when not all selected

src/HotChocolate/Data/src/Data/Projections/Expressions/QueryableProjectionVisitor.cs

@@ -2,6 +2,7 @@
 using System.Linq.Expressions;
 using HotChocolate.Data.Projections.Expressions.Handlers;
 using HotChocolate.Language;
+using HotChocolate.Resolvers;
 using HotChocolate.Types;
 
 namespace HotChocolate.Data.Projections.Expressions
@@ -18,6 +19,14 @@ protected override ISelectionVisitorAction VisitObjectType(
             var isAbstractType = field.Type.NamedType().IsAbstractType();
             if (isAbstractType && context.TryGetQueryableScope(out QueryableProjectionScope? scope))
             {
+                IReadOnlyList<IFieldSelection> selections =
+                    context.Context.GetSelections(objectType, selectionSet, true);
+
+                if (selections.Count == 0)
+                {
+                    return Continue;
+                }
+
                 context.PushInstance(
                     Expression.Convert(context.GetInstance(), objectType.RuntimeType));
                 scope.Level.Push(new Queue<MemberAssignment>());

src/HotChocolate/Data/test/Data.Projections.SqlServer.Tests/QueryableProjectionInterfaceTypeTests.cs

@@ -255,6 +255,31 @@ ... on Bar {
             res1.MatchSqlSnapshot();
         }
 
+        [Fact]
+        public async Task Create_Interface_Without_Missing()
+        {
+            // arrange
+            IRequestExecutor tester =
+                _cache.CreateSchema(_barEntities, OnModelCreating, configure: ConfigureSchema);
+
+            // act
+            // assert
+            IExecutionResult res1 = await tester.ExecuteAsync(
+                QueryRequestBuilder.New()
+                    .SetQuery(
+                        @"
+                        {
+                            root {
+                                ... on Foo {
+                                    fooProp
+                                }
+                            }
+                        }")
+                    .Create());
+
+            res1.MatchSqlSnapshot();
+        }
+
         public static void OnModelCreating(ModelBuilder modelBuilder)
         {
             modelBuilder.Entity<AbstractType>()

src/HotChocolate/Data/test/Data.Projections.SqlServer.Tests/QueryableProjectionUnionTypeTests.cs

@@ -178,6 +178,32 @@ ... on Bar {
             res1.MatchSqlSnapshot();
         }
 
+        [Fact]
+        public async Task Create_Union_Without_Missing()
+        {
+            // arrange
+            IRequestExecutor tester =
+                _cache.CreateSchema(_barEntities, OnModelCreating, configure: ConfigureSchema);
+
+            // act
+            // assert
+            IExecutionResult res1 = await tester.ExecuteAsync(
+                QueryRequestBuilder.New()
+                    .SetQuery(
+                        @"
+                        {
+                            root {
+                                ... on Foo {
+                                    fooProp
+                                }
+                            }
+                        }")
+                    .Create());
+
+            res1.MatchSqlSnapshot();
+        }
+
+
         public static void OnModelCreating(ModelBuilder modelBuilder)
         {
             modelBuilder.Entity<AbstractType>()

src/HotChocolate/Data/test/Data.Projections.SqlServer.Tests/__snapshots__/QueryableProjectionInterfaceTypeTests.Create_Interface_Without_Missing__NET5_0.snap

@@ -0,0 +1,10 @@
+{
+  "data": {
+    "root": [
+      null,
+      {
+        "fooProp": "FooProp"
+      }
+    ]
+  }
+}

src/HotChocolate/Data/test/Data.Projections.SqlServer.Tests/__snapshots__/QueryableProjectionInterfaceTypeTests.Create_Interface_Without_Missing__sql_NET5_0.snap

@@ -0,0 +1,2 @@
+SELECT "d"."d" = 'foo', "d"."FooProp"
+FROM "Data" AS "d"

src/HotChocolate/Data/test/Data.Projections.SqlServer.Tests/__snapshots__/QueryableProjectionUnionTypeTests.Create_Union_Without_Missing__NET5_0.snap

@@ -0,0 +1,10 @@
+{
+  "data": {
+    "root": [
+      null,
+      {
+        "fooProp": "FooProp"
+      }
+    ]
+  }
+}

src/HotChocolate/Data/test/Data.Projections.SqlServer.Tests/__snapshots__/QueryableProjectionUnionTypeTests.Create_Union_Without_Missing__sql_NET5_0.snap

@@ -0,0 +1,2 @@
+SELECT "d"."d" = 'foo', "d"."FooProp"
+FROM "Data" AS "d"