Fix Delaying Basic attribute fetching

hibernate-core/src/main/java/org/hibernate/query/internal/ResultMementoEntityJpa.java

@@ -83,6 +83,7 @@ public class ResultMementoEntityJpa implements ResultMementoEntity, FetchMemento
 					)
 			);
 
+			final boolean isEnhancedForLazyLoading = entityDescriptor.getRepresentationStrategy().isBytecodeEnhanced();
 			// Implicit basic fetches are DELAYED by default, so register fetch builders for the remaining basic fetchables
 			entityDescriptor.visitAttributeMappings(
 					attributeMapping -> {
@@ -90,7 +91,8 @@ public class ResultMementoEntityJpa implements ResultMementoEntity, FetchMemento
 						if ( attributeMapping instanceof BasicValuedModelPart ) {
 							fetchBuilderCreator = k -> new DelayedFetchBuilderBasicPart(
 									navigablePath.append( k ),
-									(BasicValuedModelPart) attributeMapping
+									(BasicValuedModelPart) attributeMapping,
+									isEnhancedForLazyLoading
 							);
 							explicitFetchBuilderMap.computeIfAbsent(
 									attributeMapping.getFetchableName(),

hibernate-core/src/main/java/org/hibernate/query/results/complete/DelayedFetchBuilderBasicPart.java

@@ -25,12 +25,15 @@ public class DelayedFetchBuilderBasicPart
 		implements CompleteFetchBuilder, BasicValuedFetchBuilder, ModelPartReferenceBasic {
 	private final NavigablePath navigablePath;
 	private final BasicValuedModelPart referencedModelPart;
+	private final boolean isEnhancedForLazyLoading;
 
 	public DelayedFetchBuilderBasicPart(
 			NavigablePath navigablePath,
-			BasicValuedModelPart referencedModelPart) {
+			BasicValuedModelPart referencedModelPart,
+			boolean isEnhancedForLazyLoading) {
 		this.navigablePath = navigablePath;
 		this.referencedModelPart = referencedModelPart;
+		this.isEnhancedForLazyLoading = isEnhancedForLazyLoading;
 	}
 
 	@Override
@@ -58,6 +61,7 @@ public class DelayedFetchBuilderBasicPart
 				true,
 				null,
 				FetchTiming.DELAYED,
+				isEnhancedForLazyLoading,
 				domainResultCreationState
 		);
 	}

hibernate-core/src/main/java/org/hibernate/sql/results/graph/UnfetchedBasicPartResultAssembler.java

@@ -0,0 +1,30 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
+ * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
+ */
+package org.hibernate.sql.results.graph;
+
+import org.hibernate.sql.results.jdbc.spi.JdbcValuesSourceProcessingOptions;
+import org.hibernate.sql.results.jdbc.spi.RowProcessingState;
+import org.hibernate.type.descriptor.java.JavaTypeDescriptor;
+
+public class UnfetchedBasicPartResultAssembler<J>  implements DomainResultAssembler<J> {
+
+	private final JavaTypeDescriptor<J> javaTypeDescriptor;
+
+	public UnfetchedBasicPartResultAssembler(JavaTypeDescriptor<J> javaTypeDescriptor) {
+		this.javaTypeDescriptor = javaTypeDescriptor;
+	}
+
+	@Override
+	public J assemble(RowProcessingState rowProcessingState, JdbcValuesSourceProcessingOptions options) {
+		return null;
+	}
+
+	@Override
+	public JavaTypeDescriptor<J> getAssembledJavaTypeDescriptor() {
+		return javaTypeDescriptor;
+	}
+}

hibernate-core/src/main/java/org/hibernate/sql/results/graph/basic/BasicFetch.java

@@ -12,6 +12,7 @@ import org.hibernate.metamodel.model.convert.spi.BasicValueConverter;
 import org.hibernate.query.NavigablePath;
 import org.hibernate.query.results.ResultsHelper;
 import org.hibernate.sql.results.graph.AssemblerCreationState;
+import org.hibernate.sql.results.graph.UnfetchedBasicPartResultAssembler;
 import org.hibernate.sql.results.graph.UnfetchedResultAssembler;
 import org.hibernate.sql.results.graph.DomainResult;
 import org.hibernate.sql.results.graph.DomainResultAssembler;
@@ -44,17 +45,44 @@ public class BasicFetch<T> implements Fetch, BasicResultGraphNode<T> {
 			BasicValueConverter<T, ?> valueConverter,
 			FetchTiming fetchTiming,
 			DomainResultCreationState creationState) {
+		this(
+				valuesArrayPosition,
+				fetchParent,
+				fetchablePath,
+				valuedMapping,
+				nullable,
+				valueConverter,
+				fetchTiming,
+				true,
+				creationState
+		);
+	}
+
+	public BasicFetch(
+			int valuesArrayPosition,
+			FetchParent fetchParent,
+			NavigablePath fetchablePath,
+			BasicValuedModelPart valuedMapping,
+			boolean nullable,
+			BasicValueConverter<T, ?> valueConverter,
+			FetchTiming fetchTiming,
+			boolean canBasicPartFetchBeDelayed,
+			DomainResultCreationState creationState) {
 		this.nullable = nullable;
 		this.navigablePath = fetchablePath;
 
 		this.fetchParent = fetchParent;
 		this.valuedMapping = valuedMapping;
 		this.fetchTiming = fetchTiming;
-		@SuppressWarnings("unchecked")
-		final JavaTypeDescriptor<T> javaTypeDescriptor = (JavaTypeDescriptor<T>) valuedMapping.getJavaTypeDescriptor();
+		@SuppressWarnings("unchecked") final JavaTypeDescriptor<T> javaTypeDescriptor = (JavaTypeDescriptor<T>) valuedMapping.getJavaTypeDescriptor();
 		// lazy basic attribute
 		if ( fetchTiming == FetchTiming.DELAYED && valuesArrayPosition == -1 ) {
-			this.assembler = new UnfetchedResultAssembler<>( javaTypeDescriptor );
+			if ( canBasicPartFetchBeDelayed ) {
+				this.assembler = new UnfetchedResultAssembler<>( javaTypeDescriptor );
+			}
+			else {
+				this.assembler = new UnfetchedBasicPartResultAssembler( javaTypeDescriptor );
+			}
 		}
 		else {
 			this.assembler = new BasicResultAssembler<>(

hibernate-core/src/test/java/org/hibernate/orm/test/sql/storedproc/ResultMappingTest.java

@@ -20,6 +20,7 @@ import org.junit.jupiter.api.Test;
 import static org.hibernate.testing.orm.junit.ExtraAssertions.assertTyping;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
 
 /**
  * @author Steve Ebersole
@@ -86,7 +87,8 @@ public class ResultMappingTest extends BaseSessionFactoryFunctionalTest {
 					final ResultSetOutput resultSetReturn = assertTyping( ResultSetOutput.class, currentOutput );
 					final Object result = resultSetReturn.getSingleResult();
 					assertTyping( H2ProcTesting.MyEntity.class, result );
-					assertEquals( "Steve", ( (H2ProcTesting.MyEntity) result ).name );
+					assertNull( ( (H2ProcTesting.MyEntity) result ).name );
+					assertNotNull( ( (H2ProcTesting.MyEntity) result ).id );
 				}
 		);
 	}