HHH-15831 Support non-basic values in aggregate components

hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/CockroachLegacyDialect.java

@@ -407,6 +407,8 @@ public class CockroachLegacyDialect extends Dialect {
 								.getDescriptor( Object.class )
 				)
 		);
+
+		jdbcTypeRegistry.addTypeConstructor( PostgreSQLArrayJdbcTypeConstructor.INSTANCE );
 	}
 
 	@Override

hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/PostgreSQLLegacyDialect.java

@@ -1441,6 +1441,8 @@ public class PostgreSQLLegacyDialect extends Dialect {
 								.getDescriptor( Object.class )
 				)
 		);
+
+		jdbcTypeRegistry.addTypeConstructor( PostgreSQLArrayJdbcTypeConstructor.INSTANCE );
 	}
 
 	@Override

hibernate-core/src/main/java/org/hibernate/annotations/Struct.java

@@ -47,6 +47,16 @@ public @interface Struct {
 	 */
 	String name();
 
+	/** (Optional) The catalog of the UDT.
+	 * <p> Defaults to the default catalog.
+	 */
+	String catalog() default "";
+
+	/** (Optional) The schema of the UDT.
+	 * <p> Defaults to the default schema for user.
+	 */
+	String schema() default "";
+
 	/**
 	 * The ordered set of attributes of the UDT, as they appear physically in the DDL.
 	 * It is important to specify the attributes in the same order for JDBC interactions to work correctly.

hibernate-core/src/main/java/org/hibernate/boot/internal/InFlightMetadataCollectorImpl.java

@@ -1778,7 +1778,6 @@ public class InFlightMetadataCollectorImpl implements InFlightMetadataCollector,
 			processSecondPasses( idGeneratorResolverSecondPassList );
 			processSecondPasses( implicitColumnNamingSecondPassList );
 			processSecondPasses( setBasicValueTypeSecondPassList );
-			processSecondPasses( aggregateComponentSecondPassList );
 			processSecondPasses( toOneJoinTableSecondPassList );
 
 			composites.forEach( Component::sortProperties );
@@ -1794,6 +1793,7 @@ public class InFlightMetadataCollectorImpl implements InFlightMetadataCollector,
 
 			processPropertyReferences();
 
+			processSecondPasses( aggregateComponentSecondPassList );
 			secondPassCompileForeignKeys( buildingContext );
 
 			processNaturalIdUniqueKeyBinders();

hibernate-core/src/main/java/org/hibernate/boot/model/internal/AggregateComponentBinder.java

@@ -8,20 +8,20 @@ package org.hibernate.boot.model.internal;
 
 import java.util.List;
 
-import org.hibernate.AnnotationException;
 import org.hibernate.annotations.JdbcTypeCode;
 import org.hibernate.annotations.Struct;
 import org.hibernate.annotations.common.reflection.XClass;
 import org.hibernate.annotations.common.reflection.XProperty;
+import org.hibernate.boot.model.relational.Database;
+import org.hibernate.boot.model.relational.QualifiedName;
+import org.hibernate.boot.model.relational.QualifiedNameImpl;
+import org.hibernate.boot.model.relational.QualifiedNameParser;
 import org.hibernate.boot.spi.InFlightMetadataCollector;
 import org.hibernate.boot.spi.MetadataBuildingContext;
 import org.hibernate.boot.spi.PropertyData;
-import org.hibernate.internal.util.StringHelper;
 import org.hibernate.mapping.AggregateColumn;
 import org.hibernate.mapping.BasicValue;
 import org.hibernate.mapping.Component;
-import org.hibernate.mapping.Property;
-import org.hibernate.mapping.Value;
 import org.hibernate.type.SqlTypes;
 import org.hibernate.type.descriptor.java.spi.EmbeddableAggregateJavaType;
 import org.hibernate.type.spi.TypeConfiguration;
@@ -42,19 +42,18 @@ public final class AggregateComponentBinder {
 			AnnotatedColumns columns,
 			MetadataBuildingContext context) {
 		if ( isAggregate( inferredData.getProperty(), componentXClass ) ) {
-			validateComponent( component, BinderHelper.getPath( propertyHolder, inferredData ) );
-
 			final InFlightMetadataCollector metadataCollector = context.getMetadataCollector();
 			final TypeConfiguration typeConfiguration = metadataCollector.getTypeConfiguration();
 			// Determine a struct name if this is a struct through some means
-			final String structName = determineStructName( columns, inferredData, componentXClass );
+			final QualifiedName structQualifiedName = determineStructName( columns, inferredData, componentXClass, context );
+			final String structName = structQualifiedName == null ? null : structQualifiedName.render();
 
 			// We must register a special JavaType for the embeddable which can provide a recommended JdbcType
 			typeConfiguration.getJavaTypeRegistry().resolveDescriptor(
 					component.getComponentClass(),
 					() -> new EmbeddableAggregateJavaType<>( component.getComponentClass(), structName )
 			);
-			component.setStructName( structName );
+			component.setStructName( structQualifiedName );
 			component.setStructColumnNames( determineStructAttributeNames( inferredData, componentXClass ) );
 
 			// Determine the aggregate column
@@ -97,6 +96,7 @@ public final class AggregateComponentBinder {
 							propertyHolder,
 							component,
 							componentXClass,
+							inferredData.getPropertyName(),
 							context
 					)
 			);
@@ -111,60 +111,59 @@ public final class AggregateComponentBinder {
 			case SqlTypes.TABLE:
 				return SqlTypes.STRUCT_TABLE;
 			default:
-				throw new IllegalArgumentException( "Unsupported array type code: " + arrayTypeCode );
+				throw new UnsupportedOperationException( "Dialect does not support structured array types: " + context.getMetadataCollector()
+						.getDatabase()
+						.getDialect()
+						.getClass()
+						.getName() );
 		}
 	}
 
-	private static void validateComponent(Component component, String basePath) {
-		for ( Property property : component.getProperties() ) {
-			final Value value = property.getValue();
-			if ( !( value instanceof BasicValue ) && !( value instanceof Component ) ) {
-				// todo: see HHH-15831
-				throw new AnnotationException(
-						"Property '" + StringHelper.qualify( basePath, property.getName() )
-								+ "' uses not yet supported mapping type '"
-								+ value.getClass().getName()
-								+ "' in component class '"
-								+ component.getComponentClassName()
-								+ "'. Aggregate components currently may only contain basic values and components of basic values."
-				);
-			}
-			if ( value instanceof Component ) {
-				final Component c = (Component) value;
-				if ( c.getAggregateColumn() == null ) {
-					validateComponent( c, StringHelper.qualify( basePath, property.getName() ) );
-				}
-			}
-		}
-	}
-
-	private static String determineStructName(
+	private static QualifiedName determineStructName(
 			AnnotatedColumns columns,
 			PropertyData inferredData,
-			XClass returnedClassOrElement) {
+			XClass returnedClassOrElement,
+			MetadataBuildingContext context) {
 		final XProperty property = inferredData.getProperty();
 		if ( property != null ) {
 			final Struct struct = property.getAnnotation( Struct.class );
 			if ( struct != null ) {
-				return struct.name();
+				return toQualifiedName( struct, context );
 			}
 			final JdbcTypeCode jdbcTypeCode = property.getAnnotation( JdbcTypeCode.class );
 			if ( jdbcTypeCode != null
 					&& ( jdbcTypeCode.value() == SqlTypes.STRUCT || jdbcTypeCode.value() == SqlTypes.STRUCT_ARRAY || jdbcTypeCode.value() == SqlTypes.STRUCT_TABLE )
 					&& columns != null ) {
 				final List<AnnotatedColumn> columnList = columns.getColumns();
-				if ( columnList.size() == 1 && columnList.get( 0 ).getSqlType() != null ) {
-					return columnList.get( 0 ).getSqlType();
+				final String sqlType;
+				if ( columnList.size() == 1 && ( sqlType = columnList.get( 0 ).getSqlType() ) != null ) {
+					if ( sqlType.contains( "." ) ) {
+						return QualifiedNameParser.INSTANCE.parse( sqlType );
+					}
+					return new QualifiedNameParser.NameParts(
+							null,
+							null,
+							context.getMetadataCollector().getDatabase().toIdentifier( sqlType )
+					);
 				}
 			}
 		}
 		final Struct struct = returnedClassOrElement.getAnnotation( Struct.class );
 		if ( struct != null ) {
-			return struct.name();
+			return toQualifiedName( struct, context );
 		}
 		return null;
 	}
 
+	private static QualifiedName toQualifiedName(Struct struct, MetadataBuildingContext context) {
+		final Database database = context.getMetadataCollector().getDatabase();
+		return new QualifiedNameImpl(
+				database.toIdentifier( struct.catalog() ),
+				database.toIdentifier( struct.schema() ),
+				database.toIdentifier( struct.name() )
+		);
+	}
+
 	private static String[] determineStructAttributeNames(PropertyData inferredData, XClass returnedClassOrElement) {
 		final XProperty property = inferredData.getProperty();
 		if ( property != null ) {

hibernate-core/src/main/java/org/hibernate/boot/model/internal/AggregateComponentSecondPass.java

@@ -11,25 +11,27 @@ import java.util.List;
 import java.util.Map;
 import java.util.TreeSet;
 
+import org.hibernate.AnnotationException;
 import org.hibernate.MappingException;
 import org.hibernate.annotations.Comment;
 import org.hibernate.annotations.common.reflection.XClass;
-import org.hibernate.boot.model.naming.Identifier;
 import org.hibernate.boot.model.relational.Database;
 import org.hibernate.boot.model.relational.Namespace;
+import org.hibernate.boot.model.relational.QualifiedName;
 import org.hibernate.boot.spi.InFlightMetadataCollector;
 import org.hibernate.boot.spi.MetadataBuildingContext;
 import org.hibernate.boot.spi.SecondPass;
 import org.hibernate.dialect.Dialect;
 import org.hibernate.dialect.aggregate.AggregateSupport;
 import org.hibernate.internal.util.ReflectHelper;
-import org.hibernate.internal.util.StringHelper;
 import org.hibernate.mapping.AggregateColumn;
+import org.hibernate.mapping.Collection;
 import org.hibernate.mapping.Column;
 import org.hibernate.mapping.Component;
 import org.hibernate.mapping.PersistentClass;
 import org.hibernate.mapping.Property;
 import org.hibernate.mapping.Selectable;
+import org.hibernate.mapping.ToOne;
 import org.hibernate.mapping.UserDefinedObjectType;
 import org.hibernate.mapping.Value;
 import org.hibernate.metamodel.internal.EmbeddableHelper;
@@ -37,6 +39,8 @@ import org.hibernate.sql.Template;
 import org.hibernate.type.SqlTypes;
 import org.hibernate.type.spi.TypeConfiguration;
 
+import static org.hibernate.internal.util.StringHelper.qualify;
+
 /**
  * @author Christian Beikov
  */
@@ -45,20 +49,26 @@ public class AggregateComponentSecondPass implements SecondPass {
 	private final PropertyHolder propertyHolder;
 	private final Component component;
 	private final XClass componentXClass;
+	private final String propertyName;
 	private final MetadataBuildingContext context;
 
 	public AggregateComponentSecondPass(
 			PropertyHolder propertyHolder,
 			Component component,
 			XClass componentXClass,
+			String propertyName,
 			MetadataBuildingContext context) {
 		this.propertyHolder = propertyHolder;
 		this.component = component;
 		this.componentXClass = componentXClass;
+		this.propertyName = propertyName;
 		this.context = context;
 	}
 
+	@Override
 	public void doSecondPass(Map<String, PersistentClass> persistentClasses) throws MappingException {
+		validateComponent( component, qualify( propertyHolder.getPath(), propertyName ), isAggregateArray() );
+
 		final InFlightMetadataCollector metadataCollector = context.getMetadataCollector();
 		final TypeConfiguration typeConfiguration = metadataCollector.getTypeConfiguration();
 		final Database database = metadataCollector.getDatabase();
@@ -72,21 +82,17 @@ public class AggregateComponentSecondPass implements SecondPass {
 		final List<Column> aggregatedColumns = component.getAggregatedColumns();
 		final AggregateColumn aggregateColumn = component.getAggregateColumn();
 
-		ensureInitialized( metadataCollector, typeConfiguration, dialect, aggregateColumn );
+		ensureInitialized( metadataCollector, aggregateColumn );
 		validateSupportedColumnTypes( propertyHolder.getPath(), component );
 
-		for ( org.hibernate.mapping.Column aggregatedColumn : aggregatedColumns ) {
-			// Make sure this state is initialized
-			aggregatedColumn.getSqlTypeCode( metadataCollector );
-			aggregatedColumn.getSqlType( metadataCollector );
-		}
-
-		final String structName = component.getStructName();
+		final QualifiedName structName = component.getStructName();
 		final boolean addAuxiliaryObjects;
 		if ( structName != null ) {
-			final Namespace defaultNamespace = database.getDefaultNamespace();
-			final Identifier udtName = Identifier.toIdentifier( structName );
-			final UserDefinedObjectType udt = new UserDefinedObjectType( "orm", defaultNamespace, udtName );
+			final Namespace namespace = database.locateNamespace(
+					structName.getCatalogName(),
+					structName.getSchemaName()
+			);
+			final UserDefinedObjectType udt = new UserDefinedObjectType( "orm", namespace, structName.getObjectName() );
 			final Comment comment = componentXClass.getAnnotation( Comment.class );
 			if ( comment != null ) {
 				udt.setComment( comment.value() );
@@ -94,8 +100,8 @@ public class AggregateComponentSecondPass implements SecondPass {
 			for ( org.hibernate.mapping.Column aggregatedColumn : aggregatedColumns ) {
 				udt.addColumn( aggregatedColumn );
 			}
-			final UserDefinedObjectType registeredUdt = defaultNamespace.createUserDefinedType(
-					udtName,
+			final UserDefinedObjectType registeredUdt = namespace.createUserDefinedType(
+					structName.getObjectName(),
 					name -> udt
 			);
 			if ( registeredUdt == udt ) {
@@ -187,6 +193,66 @@ public class AggregateComponentSecondPass implements SecondPass {
 		propertyHolder.getTable().getColumns().removeAll( aggregatedColumns );
 	}
 
+	private static void validateComponent(Component component, String basePath, boolean inArray) {
+		for ( Property property : component.getProperties() ) {
+			final Value value = property.getValue();
+			if ( value instanceof Component ) {
+				final Component c = (Component) value;
+				validateComponent( c, qualify( basePath, property.getName() ), inArray );
+			}
+			else if ( value instanceof ToOne ) {
+				final ToOne toOne = (ToOne) value;
+				if ( inArray && toOne.getReferencedPropertyName() != null ) {
+					throw new AnnotationException(
+							"Property '" + qualify( basePath, property.getName() )
+									+ "' uses one-to-one mapping with mappedBy '"
+									+ toOne.getReferencedPropertyName()
+									+ "' in the aggregate component class '"
+									+ component.getComponentClassName()
+									+ "' within an array property, which is not allowed."
+					);
+				}
+			}
+			else if ( value instanceof Collection ) {
+				final Collection collection = (Collection) value;
+				if ( inArray && collection.getMappedByProperty() != null ) {
+					throw new AnnotationException(
+							"Property '" + qualify( basePath, property.getName() )
+									+ "' uses *-to-many mapping with mappedBy '"
+									+ collection.getMappedByProperty()
+									+ "' in the aggregate component class '"
+									+ component.getComponentClassName()
+									+ "' within an array property, which is not allowed."
+					);
+				}
+				if ( inArray && collection.getCollectionTable() != null ) {
+					throw new AnnotationException(
+							"Property '" + qualify( basePath, property.getName() )
+									+ "' defines a collection table '"
+									+ collection.getCollectionTable()
+									+ "' in the aggregate component class '"
+									+ component.getComponentClassName()
+									+ "' within an array property, which is not allowed."
+					);
+				}
+			}
+		}
+	}
+
+	private boolean isAggregateArray() {
+		switch ( component.getAggregateColumn().getSqlTypeCode( context.getMetadataCollector() ) ) {
+			case SqlTypes.STRUCT_ARRAY:
+			case SqlTypes.STRUCT_TABLE:
+			case SqlTypes.JSON_ARRAY:
+			case SqlTypes.XML_ARRAY:
+			case SqlTypes.ARRAY:
+			case SqlTypes.TABLE:
+				return true;
+			default:
+				return false;
+		}
+	}
+
 	private void orderColumns(UserDefinedObjectType userDefinedType, int[] originalOrder) {
 		final Class<?> componentClass = component.getComponentClass();
 		final String[] structColumnNames = component.getStructColumnNames();
@@ -303,7 +369,7 @@ public class AggregateComponentSecondPass implements SecondPass {
 			if ( value instanceof Component ) {
 				final Component subComponent = (Component) value;
 				if ( subComponent.getAggregateColumn() == null ) {
-					validateSupportedColumnTypes( StringHelper.qualify( basePath, property.getName() ), subComponent );
+					validateSupportedColumnTypes( qualify( basePath, property.getName() ), subComponent );
 				}
 			}
 		}
@@ -311,8 +377,27 @@ public class AggregateComponentSecondPass implements SecondPass {
 
 	private static void ensureInitialized(
 			InFlightMetadataCollector metadataCollector,
-			TypeConfiguration typeConfiguration,
-			Dialect dialect,
+			AggregateColumn aggregateColumn) {
+		ensureParentInitialized( metadataCollector, aggregateColumn );
+		ensureChildrenInitialized( metadataCollector, aggregateColumn );
+	}
+
+	private static void ensureChildrenInitialized(
+			InFlightMetadataCollector metadataCollector,
+			AggregateColumn aggregateColumn) {
+		for ( Column aggregatedColumn : aggregateColumn.getComponent().getAggregatedColumns() ) {
+			// Make sure this state is initialized
+			aggregatedColumn.getSqlTypeCode( metadataCollector );
+			aggregatedColumn.getSqlType( metadataCollector );
+			if ( aggregatedColumn instanceof AggregateColumn ) {
+				ensureChildrenInitialized( metadataCollector, (AggregateColumn) aggregatedColumn );
+			}
+		}
+
+	}
+
+	private static void ensureParentInitialized(
+			InFlightMetadataCollector metadataCollector,
 			AggregateColumn aggregateColumn) {
 		do {
 			// Trigger resolving of the value so that the column gets properly filled

hibernate-core/src/main/java/org/hibernate/boot/model/internal/BasicValueBinder.java

@@ -1224,6 +1224,11 @@ public class BasicValueBinder implements JdbcTypeIndicators {
 
 		basicValue = new BasicValue( buildingContext, table );
 
+		if ( columns.getPropertyHolder().isComponent() ) {
+			final ComponentPropertyHolder propertyHolder = (ComponentPropertyHolder) columns.getPropertyHolder();
+			basicValue.setAggregateColumn( propertyHolder.getAggregateColumn() );
+		}
+
 		if ( isNationalized() ) {
 			basicValue.makeNationalized();
 		}

hibernate-core/src/main/java/org/hibernate/boot/model/internal/ComponentPropertyHolder.java

@@ -14,6 +14,7 @@ import org.hibernate.annotations.common.reflection.XClass;
 import org.hibernate.annotations.common.reflection.XProperty;
 import org.hibernate.boot.spi.MetadataBuildingContext;
 import org.hibernate.boot.spi.PropertyData;
+import org.hibernate.mapping.AggregateColumn;
 import org.hibernate.mapping.Component;
 import org.hibernate.mapping.Join;
 import org.hibernate.mapping.KeyValue;
@@ -265,7 +266,7 @@ public class ComponentPropertyHolder extends AbstractPropertyHolder {
 		// if a property is set already the core cannot support that
 		if ( columns != null ) {
 			final Table table = columns.getTable();
-			if ( !table.equals( component.getTable() ) ) {
+			if ( !table.equals( getTable() ) ) {
 				if ( component.getPropertySpan() == 0 ) {
 					component.setTable( table );
 				}
@@ -301,6 +302,11 @@ public class ComponentPropertyHolder extends AbstractPropertyHolder {
 		return component.getOwner().getClassName();
 	}
 
+	public AggregateColumn getAggregateColumn() {
+		final AggregateColumn aggregateColumn = component.getAggregateColumn();
+		return aggregateColumn != null ? aggregateColumn : component.getParentAggregateColumn();
+	}
+
 	@Override
 	public Table getTable() {
 		return component.getTable();

hibernate-core/src/main/java/org/hibernate/boot/model/internal/EmbeddableBinder.java

@@ -28,6 +28,7 @@ import org.hibernate.boot.spi.AccessType;
 import org.hibernate.boot.spi.MetadataBuildingContext;
 import org.hibernate.boot.spi.PropertyData;
 import org.hibernate.internal.CoreMessageLogger;
+import org.hibernate.mapping.AggregateColumn;
 import org.hibernate.mapping.BasicValue;
 import org.hibernate.mapping.Component;
 import org.hibernate.mapping.Property;
@@ -371,6 +372,14 @@ public class EmbeddableBinder {
 			returnedClassOrElement = context.getBootstrapContext().getReflectionManager()
 					.toXClass( compositeUserType.embeddable() );
 		}
+		AggregateComponentBinder.processAggregate(
+				component,
+				propertyHolder,
+				inferredData,
+				returnedClassOrElement,
+				columns,
+				context
+		);
 
 		final XClass annotatedClass = inferredData.getPropertyClass();
 		final List<PropertyData> classElements =
@@ -447,14 +456,6 @@ public class EmbeddableBinder {
 			processCompositeUserType( component, compositeUserType );
 		}
 
-		AggregateComponentBinder.processAggregate(
-				component,
-				propertyHolder,
-				inferredData,
-				returnedClassOrElement,
-				columns,
-				context
-		);
 		return component;
 	}
 
@@ -563,6 +564,7 @@ public class EmbeddableBinder {
 		columns.setBuildingContext( context );
 		discriminatorColumn.setParent( columns );
 		final BasicValue discriminatorColumnBinding = new BasicValue( context, component.getTable() );
+		discriminatorColumnBinding.setAggregateColumn( component.getAggregateColumn() );
 		component.setDiscriminator( discriminatorColumnBinding );
 		discriminatorColumn.linkWithValue( discriminatorColumnBinding );
 		discriminatorColumnBinding.setTypeName( discriminatorColumn.getDiscriminatorTypeName() );
@@ -858,6 +860,10 @@ public class EmbeddableBinder {
 		if ( constructor != null ) {
 			component.setInstantiator( constructor, constructor.getAnnotation( Instantiator.class ).value() );
 		}
+		if ( propertyHolder.isComponent() ) {
+			final ComponentPropertyHolder componentPropertyHolder = (ComponentPropertyHolder) propertyHolder;
+			component.setParentAggregateColumn( componentPropertyHolder.getAggregateColumn() );
+		}
 		return component;
 	}
 

hibernate-core/src/main/java/org/hibernate/boot/model/relational/Namespace.java

@@ -34,6 +34,7 @@ import org.hibernate.mapping.UserDefinedArrayType;
 import org.hibernate.mapping.UserDefinedObjectType;
 import org.hibernate.mapping.UserDefinedType;
 import org.hibernate.type.BasicType;
+import org.hibernate.type.Type;
 import org.hibernate.type.descriptor.jdbc.ArrayJdbcType;
 import org.hibernate.type.descriptor.jdbc.JdbcType;
 import org.hibernate.type.descriptor.jdbc.SqlTypedJdbcType;
@@ -183,7 +184,9 @@ public class Namespace {
 			final UserDefinedType udt = entry.getValue();
 			if ( udt instanceof UserDefinedObjectType ) {
 				for ( Column udtColumn : ( (UserDefinedObjectType) udt ).getColumns() ) {
-					final JdbcType jdbcType = ( (BasicType<?>) udtColumn.getValue().getType() ).getJdbcType();
+					final Type udtColumnType = udtColumn.getValue().getType();
+					if ( udtColumnType instanceof BasicType<?> ) {
+						final JdbcType jdbcType = ( (BasicType<?>) udtColumnType ).getJdbcType();
 						if ( jdbcType instanceof SqlTypedJdbcType ) {
 							dependencies.add( Identifier.toIdentifier( ( (SqlTypedJdbcType) jdbcType ).getSqlTypeName() ) );
 						}
@@ -194,6 +197,7 @@ public class Namespace {
 							}
 						}
 					}
+				}
 				if ( dependencies.isEmpty() ) {
 					// The UDTs without dependencies are added directly
 					orderedUdts.put( udt.getNameIdentifier(), udt );

hibernate-core/src/main/java/org/hibernate/dialect/AbstractPostgreSQLStructJdbcType.java

@@ -24,13 +24,11 @@ import java.util.ArrayList;
 import java.util.TimeZone;
 
 import org.hibernate.internal.util.CharSequenceHelper;
-import org.hibernate.metamodel.mapping.BasicValuedMapping;
 import org.hibernate.metamodel.mapping.EmbeddableMappingType;
 import org.hibernate.metamodel.mapping.JdbcMapping;
 import org.hibernate.metamodel.mapping.MappingType;
 import org.hibernate.metamodel.mapping.SelectableMapping;
 import org.hibernate.metamodel.mapping.ValuedModelPart;
-import org.hibernate.metamodel.mapping.internal.EmbeddedAttributeMapping;
 import org.hibernate.sql.ast.spi.SqlAppender;
 import org.hibernate.sql.ast.spi.StringBuilderSqlAppender;
 import org.hibernate.type.BasicPluralType;
@@ -1008,7 +1006,7 @@ public abstract class AbstractPostgreSQLStructJdbcType implements StructJdbcType
 			final int size = numberOfAttributeMappings + ( embeddableMappingType.isPolymorphic() ? 1 : 0 );
 			int count = 0;
 			for ( int i = 0; i < size; i++ ) {
-				final ValuedModelPart modelPart = getEmbeddedPart( embeddableMappingType, numberOfAttributeMappings, orderMapping[i] );
+				final ValuedModelPart modelPart = getEmbeddedPart( embeddableMappingType, orderMapping[i] );
 				final MappingType mappedType = modelPart.getMappedType();
 				if ( mappedType instanceof EmbeddableMappingType ) {
 					final EmbeddableMappingType embeddableMappingType = (EmbeddableMappingType) mappedType;
@@ -1178,7 +1176,7 @@ public abstract class AbstractPostgreSQLStructJdbcType implements StructJdbcType
 		return rawJdbcValue.toString();
 	}
 
-	protected <X> String toString(X value, JavaType<X> javaType, WrapperOptions options) {
+	protected <X> String toString(X value, JavaType<X> javaType, WrapperOptions options) throws SQLException {
 		if ( value == null ) {
 			return null;
 		}
@@ -1187,86 +1185,62 @@ public abstract class AbstractPostgreSQLStructJdbcType implements StructJdbcType
 		return sb.toString();
 	}
 
-	private void serializeStructTo(PostgreSQLAppender appender, Object value, WrapperOptions options) {
-		serializeValuesTo( appender, options, embeddableMappingType, value, '(' );
+	private void serializeStructTo(PostgreSQLAppender appender, Object value, WrapperOptions options) throws SQLException {
+		serializeDomainValueTo( appender, options, value, '(' );
 		appender.append( ')' );
 	}
 
-	private void serializeValuesTo(
+	private void serializeDomainValueTo(
 			PostgreSQLAppender appender,
 			WrapperOptions options,
-			EmbeddableMappingType embeddableMappingType,
 			Object domainValue,
-			char separator) {
-		final Object[] array = embeddableMappingType.getValues( domainValue );
-		final int numberOfAttributes = embeddableMappingType.getNumberOfAttributeMappings();
-		for ( int i = 0; i < array.length; i++ ) {
-			final ValuedModelPart attributeMapping;
-			final Object attributeValue;
-			if ( orderMapping == null ) {
-				attributeMapping = getEmbeddedPart( embeddableMappingType, numberOfAttributes, i );
-				attributeValue = array[i];
-			}
-			else {
-				attributeMapping = getEmbeddedPart( embeddableMappingType, numberOfAttributes, orderMapping[i] );
-				attributeValue = array[orderMapping[i]];
-			}
-			if ( attributeMapping instanceof BasicValuedMapping ) {
-				appender.append( separator );
-				separator = ',';
-				if ( attributeValue == null ) {
-					continue;
-				}
-				final JdbcMapping jdbcMapping = ( (BasicValuedMapping) attributeMapping ).getJdbcMapping();
-				serializeBasicTo( appender, options, jdbcMapping, attributeValue );
-			}
-			else if ( attributeMapping instanceof EmbeddedAttributeMapping ) {
-				final EmbeddableMappingType mappingType = (EmbeddableMappingType) attributeMapping.getMappedType();
-				final SelectableMapping aggregateMapping = mappingType.getAggregateMapping();
-				if ( aggregateMapping == null ) {
-					serializeValuesTo(
+			char separator) throws SQLException {
+		serializeJdbcValuesTo(
 				appender,
 				options,
-							mappingType,
-							attributeValue,
+				StructHelper.getJdbcValues( embeddableMappingType, orderMapping, domainValue, options ),
 				separator
 		);
-					separator = ',';
-				}
-				else {
-					appender.append( separator );
-					separator = ',';
-					if ( attributeValue == null ) {
-						continue;
-					}
-					appender.quoteStart();
-					( (AbstractPostgreSQLStructJdbcType) aggregateMapping.getJdbcMapping().getJdbcType() ).serializeStructTo(
-							appender,
-							attributeValue,
-							options
-					);
-					appender.quoteEnd();
-				}
-			}
-			else {
-				throw new UnsupportedOperationException( "Unsupported attribute mapping: " + attributeMapping );
-			}
-		}
 	}
 
-	private void serializeBasicTo(
+	private void serializeJdbcValuesTo(
 			PostgreSQLAppender appender,
 			WrapperOptions options,
-			JdbcMapping jdbcMapping,
-			Object value) {
-		serializeConvertedBasicTo( appender, options, jdbcMapping, jdbcMapping.convertToRelationalValue( value ) );
+			Object[] jdbcValues,
+			char separator) throws SQLException {
+		for ( int i = 0; i < jdbcValues.length; i++ ) {
+			appender.append( separator );
+			separator = ',';
+			final Object jdbcValue = jdbcValues[i];
+			if ( jdbcValue == null ) {
+				continue;
+			}
+			final SelectableMapping selectableMapping = orderMapping == null ?
+					embeddableMappingType.getJdbcValueSelectable( i ) :
+					embeddableMappingType.getJdbcValueSelectable( orderMapping[i] );
+			final JdbcMapping jdbcMapping = selectableMapping.getJdbcMapping();
+			if ( jdbcMapping.getJdbcType() instanceof AbstractPostgreSQLStructJdbcType ) {
+				appender.quoteStart();
+				( (AbstractPostgreSQLStructJdbcType) jdbcMapping.getJdbcType() ).serializeJdbcValuesTo(
+						appender,
+						options,
+						(Object[]) jdbcValue,
+						'('
+				);
+				appender.append( ')' );
+				appender.quoteEnd();
+			}
+			else {
+				serializeConvertedBasicTo( appender, options, jdbcMapping, jdbcValue );
+			}
+		}
 	}
 
 	private void serializeConvertedBasicTo(
 			PostgreSQLAppender appender,
 			WrapperOptions options,
 			JdbcMapping jdbcMapping,
-			Object subValue) {
+			Object subValue) throws SQLException {
 		//noinspection unchecked
 		final JavaType<Object> jdbcJavaType = (JavaType<Object>) jdbcMapping.getJdbcJavaType();
 		switch ( jdbcMapping.getJdbcType().getDefaultSqlTypeCode() ) {
@@ -1291,14 +1265,7 @@ public abstract class AbstractPostgreSQLStructJdbcType implements StructJdbcType
 			case SqlTypes.DECIMAL:
 			case SqlTypes.NUMERIC:
 			case SqlTypes.DURATION:
-				jdbcJavaType.appendEncodedString(
-						appender,
-						jdbcJavaType.unwrap(
-								subValue,
-								jdbcJavaType.getJavaTypeClass(),
-								options
-						)
-				);
+				appender.append( subValue.toString() );
 				break;
 			case SqlTypes.CHAR:
 			case SqlTypes.NCHAR:
@@ -1316,14 +1283,7 @@ public abstract class AbstractPostgreSQLStructJdbcType implements StructJdbcType
 			case SqlTypes.ENUM:
 			case SqlTypes.NAMED_ENUM:
 				appender.quoteStart();
-				jdbcJavaType.appendEncodedString(
-						appender,
-						jdbcJavaType.unwrap(
-								subValue,
-								jdbcJavaType.getJavaTypeClass(),
-								options
-						)
-				);
+				appender.append( (String) subValue );
 				appender.quoteEnd();
 				break;
 			case SqlTypes.DATE:
@@ -1393,9 +1353,8 @@ public abstract class AbstractPostgreSQLStructJdbcType implements StructJdbcType
 			case SqlTypes.STRUCT:
 				if ( subValue != null ) {
 					final AbstractPostgreSQLStructJdbcType structJdbcType = (AbstractPostgreSQLStructJdbcType) jdbcMapping.getJdbcType();
-					final EmbeddableMappingType subEmbeddableMappingType = structJdbcType.getEmbeddableMappingType();
 					appender.quoteStart();
-					structJdbcType.serializeValuesTo( appender, options, subEmbeddableMappingType, subValue, '(' );
+					structJdbcType.serializeJdbcValuesTo( appender, options, (Object[]) subValue, '(' );
 					appender.append( ')' );
 					appender.quoteEnd();
 				}
@@ -1427,9 +1386,8 @@ public abstract class AbstractPostgreSQLStructJdbcType implements StructJdbcType
 			else {
 				attributeIndex = orderMapping[i];
 			}
-			final ValuedModelPart modelPart = getEmbeddedPart( embeddableMappingType, numberOfAttributeMappings, attributeIndex );
 			jdbcIndex += injectAttributeValue(
-					modelPart,
+					getEmbeddedPart( embeddableMappingType, attributeIndex ),
 					attributeValues,
 					attributeIndex,
 					rawJdbcValues,
@@ -1567,6 +1525,10 @@ public abstract class AbstractPostgreSQLStructJdbcType implements StructJdbcType
 				: options.getJdbcTimeZone();
 	}
 
+	protected <X> Object getBindValue(X value, WrapperOptions options) throws SQLException {
+		return StructHelper.getJdbcValues( embeddableMappingType, orderMapping, value, options );
+	}
+
 	private static class PostgreSQLAppender extends StringBuilderSqlAppender {
 
 		private int quote = 1;

hibernate-core/src/main/java/org/hibernate/dialect/CockroachDialect.java

@@ -410,6 +410,8 @@ public class CockroachDialect extends Dialect {
 								.getDescriptor( Object.class )
 				)
 		);
+
+		jdbcTypeRegistry.addTypeConstructor( PostgreSQLArrayJdbcTypeConstructor.INSTANCE );
 	}
 
 	@Override

hibernate-core/src/main/java/org/hibernate/dialect/JsonHelper.java

@@ -73,7 +73,7 @@ public class JsonHelper {
 		final Object[] values = embeddableMappingType.getValues( domainValue );
 		final int numberOfAttributes = embeddableMappingType.getNumberOfAttributeMappings();
 		for ( int i = 0; i < values.length; i++ ) {
-			final ValuedModelPart attributeMapping = getEmbeddedPart( embeddableMappingType, numberOfAttributes, i );
+			final ValuedModelPart attributeMapping = getEmbeddedPart( embeddableMappingType, i );
 			if ( attributeMapping instanceof SelectableMapping ) {
 				final String name = ( (SelectableMapping) attributeMapping ).getSelectableName();
 				appender.append( separator );

hibernate-core/src/main/java/org/hibernate/dialect/OracleArrayJdbcType.java

@@ -69,6 +69,8 @@ public class OracleArrayJdbcType extends ArrayJdbcType implements SqlTypedJdbcTy
 
 	@Override
 	public <X> ValueBinder<X> getBinder(final JavaType<X> javaTypeDescriptor) {
+		//noinspection unchecked
+		final ValueBinder<Object> elementBinder = getElementJdbcType().getBinder( ( (BasicPluralJavaType<Object>) javaTypeDescriptor ).getElementJavaType() );
 		return new BasicBinder<>( javaTypeDescriptor, this ) {
 			private String typeName(WrapperOptions options) {
 				return ( upperTypeName == null
@@ -105,7 +107,7 @@ public class OracleArrayJdbcType extends ArrayJdbcType implements SqlTypedJdbcTy
 
 			@Override
 			public java.sql.Array getBindValue(X value, WrapperOptions options) throws SQLException {
-				final Object[] objects = OracleArrayJdbcType.this.getArray( this, value, options );
+				final Object[] objects = ( (OracleArrayJdbcType) getJdbcType() ).getArray( this, elementBinder, value, options );
 				final String arrayTypeName = typeName( options );
 
 				final OracleConnection oracleConnection = options.getSession()

hibernate-core/src/main/java/org/hibernate/dialect/OracleBaseStructJdbcType.java

@@ -6,6 +6,9 @@
  */
 package org.hibernate.dialect;
 
+import java.sql.CallableStatement;
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
 import java.util.Locale;
 
 import org.hibernate.HibernateException;
@@ -17,9 +20,12 @@ import org.hibernate.metamodel.mapping.EmbeddableMappingType;
 import org.hibernate.metamodel.mapping.JdbcMapping;
 import org.hibernate.metamodel.mapping.SelectableMapping;
 import org.hibernate.metamodel.spi.RuntimeModelCreationContext;
+import org.hibernate.type.Type;
+import org.hibernate.type.descriptor.ValueBinder;
 import org.hibernate.type.descriptor.WrapperOptions;
 import org.hibernate.type.descriptor.java.JavaType;
 import org.hibernate.type.descriptor.jdbc.AggregateJdbcType;
+import org.hibernate.type.descriptor.jdbc.BasicBinder;
 
 import oracle.sql.TIMESTAMPTZ;
 
@@ -41,6 +47,28 @@ public class OracleBaseStructJdbcType extends StructJdbcType {
 		);
 	}
 
+	@Override
+	public <X> ValueBinder<X> getBinder(JavaType<X> javaType) {
+		return new BasicBinder<>( javaType, this ) {
+			@Override
+			protected void doBind(PreparedStatement st, X value, int index, WrapperOptions options)
+					throws SQLException {
+				st.setObject( index, createJdbcValue( value, options ) );
+			}
+
+			@Override
+			protected void doBind(CallableStatement st, X value, String name, WrapperOptions options)
+					throws SQLException {
+				st.setObject( name, createJdbcValue( value, options ) );
+			}
+
+			@Override
+			public Object getBindValue(X value, WrapperOptions options) throws SQLException {
+				return createJdbcValue( value, options );
+			}
+		};
+	}
+
 	@Override
 	public String getExtraCreateTableInfo(
 			JavaType<?> javaType,
@@ -51,7 +79,9 @@ public class OracleBaseStructJdbcType extends StructJdbcType {
 				.locateUserDefinedType( Identifier.toIdentifier( getSqlTypeName() ) );
 		StringBuilder sb = null;
 		for ( Column column : udt.getColumns() ) {
-			final JdbcMapping jdbcMapping = (JdbcMapping) column.getValue().getType();
+			final Type columnType = column.getValue().getType();
+			if ( columnType instanceof JdbcMapping ) {
+				final JdbcMapping jdbcMapping = (JdbcMapping) columnType;
 				final String extraCreateTableInfo = jdbcMapping.getJdbcType().getExtraCreateTableInfo(
 						jdbcMapping.getJavaTypeDescriptor(),
 						columnName + "." + column.getName(),
@@ -68,6 +98,7 @@ public class OracleBaseStructJdbcType extends StructJdbcType {
 					sb.append( extraCreateTableInfo );
 				}
 			}
+		}
 		return sb != null ? sb.toString() : "";
 	}
 }

hibernate-core/src/main/java/org/hibernate/dialect/PostgreSQLArrayJdbcType.java

@@ -0,0 +1,97 @@
+/*
+ * 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.dialect;
+
+import java.sql.CallableStatement;
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
+import java.sql.Types;
+
+import org.hibernate.HibernateException;
+import org.hibernate.engine.spi.SharedSessionContractImplementor;
+import org.hibernate.type.descriptor.ValueBinder;
+import org.hibernate.type.descriptor.WrapperOptions;
+import org.hibernate.type.descriptor.java.BasicPluralJavaType;
+import org.hibernate.type.descriptor.java.JavaType;
+import org.hibernate.type.descriptor.jdbc.AggregateJdbcType;
+import org.hibernate.type.descriptor.jdbc.ArrayJdbcType;
+import org.hibernate.type.descriptor.jdbc.BasicBinder;
+import org.hibernate.type.descriptor.jdbc.JdbcType;
+
+/**
+ * Descriptor for {@link Types#ARRAY ARRAY} handling.
+ */
+public class PostgreSQLArrayJdbcType extends ArrayJdbcType {
+
+	public PostgreSQLArrayJdbcType(JdbcType elementJdbcType) {
+		super( elementJdbcType );
+	}
+
+	@Override
+	public <X> ValueBinder<X> getBinder(final JavaType<X> javaTypeDescriptor) {
+		//noinspection unchecked
+		final ValueBinder<Object> elementBinder = getElementJdbcType().getBinder( ( (BasicPluralJavaType<Object>) javaTypeDescriptor ).getElementJavaType() );
+		return new BasicBinder<>( javaTypeDescriptor, this ) {
+
+			@Override
+			protected void doBind(PreparedStatement st, X value, int index, WrapperOptions options) throws SQLException {
+				st.setArray( index, getArray( value, options ) );
+			}
+
+			@Override
+			protected void doBind(CallableStatement st, X value, String name, WrapperOptions options)
+					throws SQLException {
+				final java.sql.Array arr = getArray( value, options );
+				try {
+					st.setObject( name, arr, java.sql.Types.ARRAY );
+				}
+				catch (SQLException ex) {
+					throw new HibernateException( "JDBC driver does not support named parameters for setArray. Use positional.", ex );
+				}
+			}
+
+			@Override
+			public Object getBindValue(X value, WrapperOptions options) throws SQLException {
+				return ( (PostgreSQLArrayJdbcType) getJdbcType() ).getArray( this, elementBinder, value, options );
+			}
+
+			private java.sql.Array getArray(X value, WrapperOptions options) throws SQLException {
+				final PostgreSQLArrayJdbcType arrayJdbcType = (PostgreSQLArrayJdbcType) getJdbcType();
+				final Object[] objects;
+
+				final JdbcType elementJdbcType = arrayJdbcType.getElementJdbcType();
+				if ( elementJdbcType instanceof AggregateJdbcType ) {
+					// The PostgreSQL JDBC driver does not support arrays of structs, which contain byte[]
+					final AggregateJdbcType aggregateJdbcType = (AggregateJdbcType) elementJdbcType;
+					final Object[] domainObjects = getJavaType().unwrap(
+							value,
+							Object[].class,
+							options
+					);
+					objects = new Object[domainObjects.length];
+					for ( int i = 0; i < domainObjects.length; i++ ) {
+						objects[i] = aggregateJdbcType.createJdbcValue( domainObjects[i], options );
+					}
+				}
+				else {
+					objects = arrayJdbcType.getArray( this, elementBinder, value, options );
+				}
+
+				final SharedSessionContractImplementor session = options.getSession();
+				final String typeName = arrayJdbcType.getElementTypeName( getJavaType(), session );
+				return session.getJdbcCoordinator().getLogicalConnection().getPhysicalConnection()
+						.createArrayOf( typeName, objects );
+			}
+		};
+	}
+
+	@Override
+	public String toString() {
+		return "PostgreSQLArrayTypeDescriptor(" + getElementJdbcType().toString() + ")";
+	}
+}
+

hibernate-core/src/main/java/org/hibernate/dialect/PostgreSQLArrayJdbcTypeConstructor.java

@@ -0,0 +1,46 @@
+/*
+ * 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.dialect;
+
+import java.sql.Types;
+
+import org.hibernate.tool.schema.extract.spi.ColumnTypeInformation;
+import org.hibernate.type.BasicType;
+import org.hibernate.type.descriptor.jdbc.JdbcType;
+import org.hibernate.type.descriptor.jdbc.JdbcTypeConstructor;
+import org.hibernate.type.spi.TypeConfiguration;
+
+/**
+ * Factory for {@link PostgreSQLArrayJdbcType}.
+ */
+public class PostgreSQLArrayJdbcTypeConstructor implements JdbcTypeConstructor {
+
+	public static final PostgreSQLArrayJdbcTypeConstructor INSTANCE = new PostgreSQLArrayJdbcTypeConstructor();
+
+	@Override
+	public JdbcType resolveType(
+			TypeConfiguration typeConfiguration,
+			Dialect dialect,
+			BasicType<?> elementType,
+			ColumnTypeInformation columnTypeInformation) {
+		return resolveType( typeConfiguration, dialect, elementType.getJdbcType(), columnTypeInformation );
+	}
+
+	@Override
+	public JdbcType resolveType(
+			TypeConfiguration typeConfiguration,
+			Dialect dialect,
+			JdbcType elementType,
+			ColumnTypeInformation columnTypeInformation) {
+		return new PostgreSQLArrayJdbcType( elementType );
+	}
+
+	@Override
+	public int getDefaultSqlTypeCode() {
+		return Types.ARRAY;
+	}
+}

hibernate-core/src/main/java/org/hibernate/dialect/PostgreSQLDialect.java

@@ -1474,6 +1474,8 @@ public class PostgreSQLDialect extends Dialect {
 		jdbcTypeRegistry.addDescriptor( PostgreSQLEnumJdbcType.INSTANCE );
 		jdbcTypeRegistry.addDescriptor( PostgreSQLOrdinalEnumJdbcType.INSTANCE );
 		jdbcTypeRegistry.addDescriptor( PostgreSQLUUIDJdbcType.INSTANCE );
+
+		jdbcTypeRegistry.addTypeConstructor( PostgreSQLArrayJdbcTypeConstructor.INSTANCE );
 	}
 
 	@Override

hibernate-core/src/main/java/org/hibernate/dialect/PostgreSQLStructCastingJdbcType.java

@@ -89,6 +89,11 @@ public class PostgreSQLStructCastingJdbcType extends AbstractPostgreSQLStructJdb
 				);
 				st.setString( name, stringValue );
 			}
+
+			@Override
+			public Object getBindValue(X value, WrapperOptions options) throws SQLException {
+				return ( (PostgreSQLStructCastingJdbcType) getJdbcType() ).getBindValue( value, options );
+			}
 		};
 	}
 }

hibernate-core/src/main/java/org/hibernate/dialect/PostgreSQLStructPGObjectJdbcType.java

@@ -97,6 +97,11 @@ public class PostgreSQLStructPGObjectJdbcType extends AbstractPostgreSQLStructJd
 				holder.setValue( stringValue );
 				st.setObject( name, holder );
 			}
+
+			@Override
+			public Object getBindValue(X value, WrapperOptions options) throws SQLException {
+				return ( (PostgreSQLStructPGObjectJdbcType) getJdbcType() ).getBindValue( value, options );
+			}
 		};
 	}
 

hibernate-core/src/main/java/org/hibernate/dialect/StructHelper.java

@@ -14,12 +14,18 @@ import java.sql.SQLException;
 
 import org.hibernate.Internal;
 import org.hibernate.engine.spi.SessionFactoryImplementor;
+import org.hibernate.metamodel.mapping.BasicValuedMapping;
 import org.hibernate.metamodel.mapping.EmbeddableMappingType;
+import org.hibernate.metamodel.mapping.EmbeddableValuedModelPart;
+import org.hibernate.metamodel.mapping.ForeignKeyDescriptor;
 import org.hibernate.metamodel.mapping.JdbcMapping;
 import org.hibernate.metamodel.mapping.MappingType;
+import org.hibernate.metamodel.mapping.PluralAttributeMapping;
 import org.hibernate.metamodel.mapping.ValuedModelPart;
+import org.hibernate.metamodel.mapping.internal.DiscriminatedAssociationAttributeMapping;
 import org.hibernate.metamodel.spi.EmbeddableInstantiator;
 import org.hibernate.metamodel.spi.EmbeddableRepresentationStrategy;
+import org.hibernate.metamodel.mapping.internal.ToOneAttributeMapping;
 import org.hibernate.type.SqlTypes;
 import org.hibernate.type.descriptor.WrapperOptions;
 import org.hibernate.type.descriptor.java.JavaType;
@@ -39,12 +45,14 @@ public class StructHelper {
 		final StructAttributeValues attributeValues = new StructAttributeValues( numberOfAttributeMappings, rawJdbcValues );
 		int jdbcIndex = 0;
 		for ( int i = 0; i < size; i++ ) {
-			final ValuedModelPart valuedModelPart = getEmbeddedPart(
-					embeddableMappingType,
-					numberOfAttributeMappings,
-					i
+			jdbcIndex += injectAttributeValue(
+					getEmbeddedPart( embeddableMappingType, i ),
+					attributeValues,
+					i,
+					rawJdbcValues,
+					jdbcIndex,
+					options
 			);
-			jdbcIndex += injectAttributeValue( valuedModelPart, attributeValues, i, rawJdbcValues, jdbcIndex, options );
 		}
 		return attributeValues;
 	}
@@ -104,26 +112,58 @@ public class StructHelper {
 		else {
 			jdbcValues = values;
 		}
-		int jdbcIndex = 0;
-		for ( int i = 0; i < values.length; i++ ) {
-			final int attributeIndex;
-			if ( orderMapping == null ) {
-				attributeIndex = i;
-			}
-			else {
-				attributeIndex = orderMapping[i];
-			}
-			jdbcIndex += injectJdbcValue(
-					getEmbeddedPart( embeddableMappingType, jdbcValueCount, attributeIndex ),
+		injectJdbcValues(
+				embeddableMappingType,
 				values,
-					attributeIndex,
+				jdbcValues,
+				0,
+				options
+		);
+		if ( orderMapping != null ) {
+			final Object[] originalJdbcValues = jdbcValues.clone();
+			for ( int i = 0; i < orderMapping.length; i++ ) {
+				jdbcValues[i] = originalJdbcValues[orderMapping[i]];
+			}
+		}
+		return jdbcValues;
+	}
+
+	private static int injectJdbcValues(
+			EmbeddableMappingType embeddableMappingType,
+			Object domainValue,
+			Object[] jdbcValues,
+			int jdbcIndex,
+			WrapperOptions options) throws SQLException {
+		return injectJdbcValues(
+				embeddableMappingType,
+				embeddableMappingType.getValues( domainValue ),
 				jdbcValues,
 				jdbcIndex,
 				options
 		);
 	}
-		assert jdbcIndex == valueCount;
-		return jdbcValues;
+
+	private static int injectJdbcValues(
+			EmbeddableMappingType embeddableMappingType,
+			Object[] values,
+			Object[] jdbcValues,
+			int jdbcIndex,
+			WrapperOptions options) throws SQLException {
+		final int jdbcValueCount = embeddableMappingType.getJdbcValueCount();
+		final int valueCount = jdbcValueCount + ( embeddableMappingType.isPolymorphic() ? 1 : 0 );
+		int offset = 0;
+		for ( int i = 0; i < values.length; i++ ) {
+			offset += injectJdbcValue(
+					getEmbeddedPart( embeddableMappingType, i ),
+					values,
+					i,
+					jdbcValues,
+					jdbcIndex + offset,
+					options
+			);
+		}
+		assert offset == valueCount;
+		return offset;
 	}
 
 	public static Object instantiate(
@@ -142,13 +182,10 @@ public class StructHelper {
 		return instantiator.instantiate( attributeValues, sessionFactory );
 	}
 
-	public static ValuedModelPart getEmbeddedPart(
-			EmbeddableMappingType embeddableMappingType,
-			int numberOfAttributes,
-			int position) {
-		return position == numberOfAttributes ?
-				embeddableMappingType.getDiscriminatorMapping() :
-				embeddableMappingType.getAttributeMapping( position );
+	public static ValuedModelPart getEmbeddedPart(EmbeddableMappingType embeddableMappingType, int position) {
+		return position == embeddableMappingType.getNumberOfAttributeMappings()
+				? embeddableMappingType.getDiscriminatorMapping()
+				: embeddableMappingType.getAttributeMapping( position );
 	}
 
 	private static int injectJdbcValue(
@@ -158,16 +195,61 @@ public class StructHelper {
 			Object[] jdbcValues,
 			int jdbcIndex,
 			WrapperOptions options) throws SQLException {
-		final MappingType mappedType = attributeMapping.getMappedType();
 		final int jdbcValueCount;
-		if ( mappedType instanceof EmbeddableMappingType ) {
-			final EmbeddableMappingType embeddableMappingType = (EmbeddableMappingType) mappedType;
-			if ( embeddableMappingType.getAggregateMapping() != null ) {
-				final AggregateJdbcType aggregateJdbcType = (AggregateJdbcType) embeddableMappingType.getAggregateMapping()
-						.getJdbcMapping()
-						.getJdbcType();
+		if ( attributeMapping instanceof ToOneAttributeMapping ) {
+			final ToOneAttributeMapping toOneAttributeMapping = (ToOneAttributeMapping) attributeMapping;
+			if ( toOneAttributeMapping.getSideNature() == ForeignKeyDescriptor.Nature.TARGET ) {
+				return 0;
+			}
+			final ForeignKeyDescriptor foreignKeyDescriptor = toOneAttributeMapping.getForeignKeyDescriptor();
+			final ValuedModelPart keyPart = foreignKeyDescriptor.getKeyPart();
+			final Object foreignKeyValue = foreignKeyDescriptor.getAssociationKeyFromSide(
+					attributeValues[attributeIndex],
+					ForeignKeyDescriptor.Nature.TARGET,
+					options.getSession()
+			);
+			if ( keyPart instanceof BasicValuedMapping ) {
 				jdbcValueCount = 1;
-				jdbcValues[jdbcIndex] = aggregateJdbcType.createJdbcValue(
+				jdbcValues[jdbcIndex] = foreignKeyValue;
+			}
+			else if ( keyPart instanceof EmbeddableValuedModelPart ) {
+				final EmbeddableMappingType mappingType = ( (EmbeddableValuedModelPart) keyPart ).getEmbeddableTypeDescriptor();
+				jdbcValueCount = injectJdbcValues(
+						mappingType,
+						foreignKeyValue,
+						jdbcValues,
+						jdbcIndex,
+						options
+				);
+			}
+			else {
+				throw new UnsupportedOperationException( "Unsupported foreign key part: " + keyPart );
+			}
+		}
+		else if ( attributeMapping instanceof PluralAttributeMapping ) {
+			return 0;
+		}
+		else if ( attributeMapping instanceof DiscriminatedAssociationAttributeMapping ) {
+			jdbcValueCount = attributeMapping.decompose(
+					attributeValues[attributeIndex],
+					jdbcIndex,
+					jdbcValues,
+					options,
+					(valueIndex, objects, wrapperOptions, value, jdbcValueMapping) -> {
+						objects[valueIndex] = value;
+					},
+					options.getSession()
+			);
+		}
+		else if ( attributeMapping instanceof EmbeddableValuedModelPart ) {
+			final EmbeddableValuedModelPart embeddableValuedModelPart = (EmbeddableValuedModelPart) attributeMapping;
+			final EmbeddableMappingType embeddableMappingType = embeddableValuedModelPart.getMappedType();
+			if ( embeddableMappingType.getAggregateMapping() != null ) {
+				jdbcValueCount = 1;
+				jdbcValues[jdbcIndex] = embeddableMappingType.getAggregateMapping()
+						.getJdbcMapping()
+						.getJdbcValueBinder()
+						.getBindValue(
 								attributeValues[attributeIndex],
 								options
 						);
@@ -180,7 +262,7 @@ public class StructHelper {
 				int offset = 0;
 				for ( int i = 0; i < numberOfValues; i++ ) {
 					offset += injectJdbcValue(
-							getEmbeddedPart( embeddableMappingType, numberOfAttributeMappings, i ),
+							getEmbeddedPart( embeddableMappingType, i ),
 							subValues,
 							i,
 							jdbcValues,
@@ -251,23 +333,27 @@ public class StructHelper {
 			int[] inverseMapping,
 			Object[] sourceJdbcValues,
 			Object[] targetJdbcValues) {
-		final int numberOfAttributes = embeddableMappingType.getNumberOfAttributeMappings();
-		int targetJdbcOffset = 0;
-		for ( int i = 0; i < numberOfAttributes + ( embeddableMappingType.isPolymorphic() ? 1 : 0 ); i++ ) {
-			final ValuedModelPart attributeMapping = getEmbeddedPart( embeddableMappingType, numberOfAttributes, i );
-			final MappingType mappedType = attributeMapping.getMappedType();
-			final int jdbcValueCount = getJdbcValueCount( mappedType );
-
-			final int attributeIndex = inverseMapping[i];
-			int sourceJdbcIndex = 0;
-			for ( int j = 0; j < attributeIndex; j++ ) {
-				sourceJdbcIndex += getJdbcValueCount( embeddableMappingType.getAttributeMapping( j ).getMappedType() );
+		for ( int i = 0; i < inverseMapping.length; i++ ) {
+			targetJdbcValues[i] = sourceJdbcValues[inverseMapping[i]];
 		}
 
-			for ( int j = 0; j < jdbcValueCount; j++ ) {
-				targetJdbcValues[targetJdbcOffset++] = sourceJdbcValues[sourceJdbcIndex + j];
-			}
-		}
+//		final int numberOfAttributes = embeddableMappingType.getNumberOfAttributeMappings();
+//		int targetJdbcOffset = 0;
+//		for ( int i = 0; i < numberOfAttributes + ( embeddableMappingType.isPolymorphic() ? 1 : 0 ); i++ ) {
+//			final ValuedModelPart attributeMapping = getEmbeddedPart( embeddableMappingType, i );
+//			final MappingType mappedType = attributeMapping.getMappedType();
+//			final int jdbcValueCount = getJdbcValueCount( mappedType );
+//
+//			final int attributeIndex = inverseMapping[i];
+//			int sourceJdbcIndex = 0;
+//			for ( int j = 0; j < attributeIndex; j++ ) {
+//				sourceJdbcIndex += getJdbcValueCount( embeddableMappingType.getAttributeMapping( j ).getMappedType() );
+//			}
+//
+//			for ( int j = 0; j < jdbcValueCount; j++ ) {
+//				targetJdbcValues[targetJdbcOffset++] = sourceJdbcValues[sourceJdbcIndex + j];
+//			}
+//		}
 	}
 
 	public static int getJdbcValueCount(MappingType mappedType) {

hibernate-core/src/main/java/org/hibernate/dialect/StructJdbcType.java

@@ -13,10 +13,16 @@ import java.sql.SQLException;
 import java.sql.Struct;
 
 import org.hibernate.boot.model.naming.Identifier;
+import org.hibernate.metamodel.mapping.BasicValuedMapping;
 import org.hibernate.metamodel.mapping.EmbeddableMappingType;
+import org.hibernate.metamodel.mapping.EmbeddableValuedModelPart;
+import org.hibernate.metamodel.mapping.ForeignKeyDescriptor;
 import org.hibernate.metamodel.mapping.JdbcMapping;
 import org.hibernate.metamodel.mapping.MappingType;
+import org.hibernate.metamodel.mapping.PluralAttributeMapping;
 import org.hibernate.metamodel.mapping.ValuedModelPart;
+import org.hibernate.metamodel.mapping.internal.DiscriminatedAssociationAttributeMapping;
+import org.hibernate.metamodel.mapping.internal.ToOneAttributeMapping;
 import org.hibernate.metamodel.spi.RuntimeModelCreationContext;
 import org.hibernate.type.BasicPluralType;
 import org.hibernate.type.BasicType;
@@ -144,9 +150,12 @@ public class StructJdbcType implements org.hibernate.type.descriptor.jdbc.Struct
 
 	@Override
 	public Object[] extractJdbcValues(Object rawJdbcValue, WrapperOptions options) throws SQLException {
-		final Object[] attributes = ( (Struct) rawJdbcValue ).getAttributes();
-		wrapRawJdbcValues( embeddableMappingType, orderMapping, inverseOrderMapping, attributes, 0, options );
-		return attributes;
+		final Object[] jdbcValues = ( (Struct) rawJdbcValue ).getAttributes();
+		if ( orderMapping != null ) {
+			StructHelper.orderJdbcValues( embeddableMappingType, inverseOrderMapping, jdbcValues.clone(), jdbcValues );
+		}
+		wrapRawJdbcValues( embeddableMappingType, jdbcValues, 0, options );
+		return jdbcValues;
 	}
 
 	@Override
@@ -198,18 +207,21 @@ public class StructJdbcType implements org.hibernate.type.descriptor.jdbc.Struct
 					return null;
 				}
 				final Struct struct = (Struct) object;
-				final Object[] values = struct.getAttributes();
+				final Object[] jdbcValues = struct.getAttributes();
 				final boolean jdbcRepresentation = getJavaType().getJavaTypeClass() == Object[].class;
 				if ( jdbcRepresentation ) {
-					wrapRawJdbcValues( embeddableMappingType, orderMapping, inverseOrderMapping, values, 0, options );
+					if ( orderMapping != null ) {
+						StructHelper.orderJdbcValues( embeddableMappingType, inverseOrderMapping, jdbcValues.clone(), jdbcValues );
+					}
+					wrapRawJdbcValues( embeddableMappingType, jdbcValues, 0, options );
 					//noinspection unchecked
-					return (X) values;
+					return (X) jdbcValues;
 				}
 				assert embeddableMappingType != null && embeddableMappingType.getJavaType() == getJavaType();
 				final StructAttributeValues attributeValues = getAttributeValues(
 						embeddableMappingType,
 						orderMapping,
-						values,
+						jdbcValues,
 						options
 				);
 				//noinspection unchecked
@@ -240,9 +252,8 @@ public class StructJdbcType implements org.hibernate.type.descriptor.jdbc.Struct
 			else {
 				attributeIndex = orderMapping[i];
 			}
-			final ValuedModelPart modelPart = getEmbeddedPart( embeddableMappingType, numberOfAttributeMappings, attributeIndex );
 			jdbcIndex += injectAttributeValue(
-					modelPart,
+					getEmbeddedPart( embeddableMappingType, attributeIndex ),
 					attributeValues,
 					attributeIndex,
 					rawJdbcValues,
@@ -381,55 +392,96 @@ public class StructJdbcType implements org.hibernate.type.descriptor.jdbc.Struct
 
 	private int wrapRawJdbcValues(
 			EmbeddableMappingType embeddableMappingType,
-			int[] orderMapping,
-			int[] inverseOrderMapping,
 			Object[] jdbcValues,
 			int jdbcIndex,
 			WrapperOptions options) throws SQLException {
-		final Object[] targetJdbcValues;
-		if ( orderMapping == null ) {
-			targetJdbcValues = jdbcValues;
-		}
-		else {
-			targetJdbcValues = jdbcValues.clone();
-		}
 		final int numberOfAttributeMappings = embeddableMappingType.getNumberOfAttributeMappings();
 		for ( int i = 0; i < numberOfAttributeMappings + ( embeddableMappingType.isPolymorphic() ? 1 : 0 ); i++ ) {
-			final ValuedModelPart attributeMapping;
-			if ( orderMapping == null ) {
-				attributeMapping = getEmbeddedPart( embeddableMappingType, numberOfAttributeMappings, i );
+			final ValuedModelPart attributeMapping = getEmbeddedPart( embeddableMappingType, i );
+			if ( attributeMapping instanceof ToOneAttributeMapping ) {
+				final ToOneAttributeMapping toOneAttributeMapping = (ToOneAttributeMapping) attributeMapping;
+				if ( toOneAttributeMapping.getSideNature() == ForeignKeyDescriptor.Nature.TARGET ) {
+					continue;
+				}
+				final ForeignKeyDescriptor foreignKeyDescriptor = toOneAttributeMapping.getForeignKeyDescriptor();
+				final ValuedModelPart keyPart = foreignKeyDescriptor.getKeyPart();
+				if ( keyPart instanceof BasicValuedMapping ) {
+					wrapRawJdbcValue( keyPart.getSingleJdbcMapping(), jdbcValues, jdbcIndex, options );
+					jdbcIndex++;
+				}
+				else if ( keyPart instanceof EmbeddableValuedModelPart ) {
+					final EmbeddableMappingType mappingType = ( (EmbeddableValuedModelPart) keyPart ).getEmbeddableTypeDescriptor();
+					jdbcIndex = wrapRawJdbcValues(
+							mappingType,
+							jdbcValues,
+							jdbcIndex,
+							options
+					);
 				}
 				else {
-				attributeMapping = getEmbeddedPart( embeddableMappingType, numberOfAttributeMappings, orderMapping[i] );
+					throw new UnsupportedOperationException( "Unsupported foreign key part: " + keyPart );
 				}
-			final MappingType mappedType = attributeMapping.getMappedType();
-
-			if ( mappedType instanceof EmbeddableMappingType ) {
-				final EmbeddableMappingType embeddableType = (EmbeddableMappingType) mappedType;
+			}
+			else if ( attributeMapping instanceof PluralAttributeMapping ) {
+				continue;
+			}
+			else if ( attributeMapping instanceof DiscriminatedAssociationAttributeMapping ) {
+				final DiscriminatedAssociationAttributeMapping discriminatedAssociationAttributeMapping = (DiscriminatedAssociationAttributeMapping) attributeMapping;
+				wrapRawJdbcValue(
+						discriminatedAssociationAttributeMapping.getDiscriminatorPart().getSingleJdbcMapping(),
+						jdbcValues,
+						jdbcIndex,
+						options
+				);
+				jdbcIndex++;
+				wrapRawJdbcValue(
+						discriminatedAssociationAttributeMapping.getKeyPart().getSingleJdbcMapping(),
+						jdbcValues,
+						jdbcIndex,
+						options
+				);
+				jdbcIndex++;
+			}
+			else if ( attributeMapping instanceof EmbeddableValuedModelPart ) {
+				final EmbeddableValuedModelPart embeddableValuedModelPart = (EmbeddableValuedModelPart) attributeMapping;
+				final EmbeddableMappingType embeddableType = embeddableValuedModelPart.getMappedType();
 				if ( embeddableType.getAggregateMapping() != null ) {
 					final AggregateJdbcType aggregateJdbcType = (AggregateJdbcType) embeddableType.getAggregateMapping()
 							.getJdbcMapping()
 							.getJdbcType();
-					final Object rawJdbcValue = targetJdbcValues[jdbcIndex];
-					targetJdbcValues[jdbcIndex] = aggregateJdbcType.extractJdbcValues( rawJdbcValue, options );
+					final Object rawJdbcValue = jdbcValues[jdbcIndex];
+					jdbcValues[jdbcIndex] = aggregateJdbcType.extractJdbcValues( rawJdbcValue, options );
 					jdbcIndex++;
 				}
 				else {
-					jdbcIndex = wrapRawJdbcValues( embeddableType, null, null, targetJdbcValues, jdbcIndex, options );
+					jdbcIndex = wrapRawJdbcValues( embeddableType, jdbcValues, jdbcIndex, options );
 				}
 			}
 			else {
 				assert attributeMapping.getJdbcTypeCount() == 1;
-				final Object rawJdbcValue = targetJdbcValues[jdbcIndex];
-				if ( rawJdbcValue != null ) {
-					final JdbcMapping jdbcMapping = attributeMapping.getSingleJdbcMapping();
+				wrapRawJdbcValue( attributeMapping.getSingleJdbcMapping(), jdbcValues, jdbcIndex, options );
+				jdbcIndex++;
+			}
+		}
+		return jdbcIndex;
+	}
+
+	private void wrapRawJdbcValue(
+			JdbcMapping jdbcMapping,
+			Object[] jdbcValues,
+			int jdbcIndex,
+			WrapperOptions options) throws SQLException {
+		final Object rawJdbcValue = jdbcValues[jdbcIndex];
+		if ( rawJdbcValue == null ) {
+			return;
+		}
 		switch ( jdbcMapping.getJdbcType().getDefaultSqlTypeCode() ) {
 			case SqlTypes.TIME_WITH_TIMEZONE:
 			case SqlTypes.TIME_UTC:
 			case SqlTypes.TIMESTAMP_WITH_TIMEZONE:
 			case SqlTypes.TIMESTAMP_UTC:
 				// Only transform the raw jdbc value if it could be a TIMESTAMPTZ
-							targetJdbcValues[jdbcIndex] = jdbcMapping.getJdbcJavaType()
+				jdbcValues[jdbcIndex] = jdbcMapping.getJdbcJavaType()
 						.wrap( transformRawJdbcValue( rawJdbcValue, options ), options );
 				break;
 			case SqlTypes.ARRAY:
@@ -451,7 +503,7 @@ public class StructJdbcType implements org.hibernate.type.descriptor.jdbc.Struct
 									options
 							);
 						}
-									targetJdbcValues[jdbcIndex] = jdbcMapping.getJdbcJavaType().wrap( newArray, options );
+						jdbcValues[jdbcIndex] = jdbcMapping.getJdbcJavaType().wrap( newArray, options );
 						break;
 					case SqlTypes.STRUCT:
 					case SqlTypes.JSON:
@@ -471,26 +523,18 @@ public class StructJdbcType implements org.hibernate.type.descriptor.jdbc.Struct
 							);
 							newArray[j] = instantiate( subEmbeddableMappingType, subValues, options.getSessionFactory() );
 						}
-									targetJdbcValues[jdbcIndex] = jdbcMapping.getJdbcJavaType().wrap( newArray, options );
+						jdbcValues[jdbcIndex] = jdbcMapping.getJdbcJavaType().wrap( newArray, options );
 						break;
 					default:
-									targetJdbcValues[jdbcIndex] = jdbcMapping.getJdbcJavaType().wrap( rawJdbcValue, options );
+						jdbcValues[jdbcIndex] = jdbcMapping.getJdbcJavaType().wrap( rawJdbcValue, options );
 						break;
 				}
 				break;
 			default:
-							targetJdbcValues[jdbcIndex] = jdbcMapping.getJdbcJavaType().wrap( rawJdbcValue, options );
+				jdbcValues[jdbcIndex] = jdbcMapping.getJdbcJavaType().wrap( rawJdbcValue, options );
 				break;
 		}
 	}
-				jdbcIndex++;
-			}
-		}
-		if ( orderMapping != null ) {
-			StructHelper.orderJdbcValues( embeddableMappingType, inverseOrderMapping, targetJdbcValues, jdbcValues );
-		}
-		return jdbcIndex;
-	}
 
 	protected Object transformRawJdbcValue(Object rawJdbcValue, WrapperOptions options) {
 		return rawJdbcValue;

hibernate-core/src/main/java/org/hibernate/dialect/XmlHelper.java

@@ -493,7 +493,7 @@ public class XmlHelper {
 			if ( array[i] == null ) {
 				continue;
 			}
-			final ValuedModelPart attributeMapping = getEmbeddedPart( embeddableMappingType, numberOfAttributes, i );
+			final ValuedModelPart attributeMapping = getEmbeddedPart( embeddableMappingType, i );
 			if ( attributeMapping instanceof SelectableMapping ) {
 				final SelectableMapping selectable = (SelectableMapping) attributeMapping;
 				final String tagName = selectable.getSelectableName();

hibernate-core/src/main/java/org/hibernate/generator/values/GeneratedValueBasicResultBuilder.java

@@ -94,7 +94,10 @@ public class GeneratedValueBasicResultBuilder implements ResultBuilder {
 		return new BasicResult<>(
 				sqlSelection.getValuesArrayPosition(),
 				null,
-				modelPart.getJdbcMapping()
+				modelPart.getJdbcMapping(),
+				navigablePath,
+				false,
+				false
 		);
 	}
 

hibernate-core/src/main/java/org/hibernate/mapping/AggregateColumn.java

@@ -13,6 +13,7 @@ import org.hibernate.sql.Template;
 import static org.hibernate.type.SqlTypes.JSON_ARRAY;
 import static org.hibernate.type.SqlTypes.STRUCT_ARRAY;
 import static org.hibernate.type.SqlTypes.STRUCT_TABLE;
+import static org.hibernate.type.SqlTypes.XML_ARRAY;
 
 /**
  * An aggregate column is a column of type {@link org.hibernate.type.SqlTypes#STRUCT},
@@ -79,7 +80,9 @@ public class AggregateColumn extends Column {
 		final AggregateColumn parentAggregateColumn = component.getParentAggregateColumn();
 		final String simpleAggregateName = aggregateColumn.getQuotedName( dialect );
 		final String aggregateSelectableExpression;
-		if ( parentAggregateColumn == null ) {
+		// If the aggregate column is an array, drop the parent read expression, because this is a NestedColumnReference
+		// and will require special rendering
+		if ( parentAggregateColumn == null || isArray( aggregateColumn ) ) {
 			aggregateSelectableExpression = getRootAggregateSelectableExpression( aggregateColumn, simpleAggregateName );
 		}
 		else {
@@ -99,13 +102,23 @@ public class AggregateColumn extends Column {
 	}
 
 	private static String getRootAggregateSelectableExpression(AggregateColumn aggregateColumn, String simpleAggregateName) {
+		if ( isArray( aggregateColumn ) ) {
+			return Template.TEMPLATE;
+		}
+		else {
+			return Template.TEMPLATE + "." + simpleAggregateName;
+		}
+	}
+
+	private static boolean isArray(AggregateColumn aggregateColumn) {
 		switch ( aggregateColumn.getTypeCode() ) {
 			case JSON_ARRAY:
+			case XML_ARRAY:
 			case STRUCT_ARRAY:
 			case STRUCT_TABLE:
-				return Template.TEMPLATE;
+				return true;
 			default:
-				return Template.TEMPLATE + "." + simpleAggregateName;
+				return false;
 		}
 	}
 

hibernate-core/src/main/java/org/hibernate/mapping/BasicValue.java

@@ -967,7 +967,7 @@ public class BasicValue extends SimpleValue implements JdbcTypeIndicators, Resol
 		return aggregateColumn == null
 				? jdbcTypeCode
 				: getDialect().getAggregateSupport()
-				.aggregateComponentSqlTypeCode( aggregateColumn.getSqlTypeCode(), jdbcTypeCode );
+				.aggregateComponentSqlTypeCode( aggregateColumn.getSqlTypeCode( getMetadata() ), jdbcTypeCode );
 	}
 
 	@Override

hibernate-core/src/main/java/org/hibernate/mapping/Component.java

@@ -24,6 +24,7 @@ import org.hibernate.Remove;
 import org.hibernate.annotations.common.reflection.XClass;
 import org.hibernate.boot.model.relational.Database;
 import org.hibernate.boot.model.relational.ExportableProducer;
+import org.hibernate.boot.model.relational.QualifiedName;
 import org.hibernate.boot.model.relational.SqlStringGenerationContext;
 import org.hibernate.boot.model.source.internal.hbm.MappingDocument;
 import org.hibernate.boot.registry.classloading.spi.ClassLoaderService;
@@ -93,7 +94,7 @@ public class Component extends SimpleValue implements MetaAttributable, Sortable
 
 	private AggregateColumn aggregateColumn;
 	private AggregateColumn parentAggregateColumn;
-	private String structName;
+	private QualifiedName structName;
 	private String[] structColumnNames;
 	private transient Class<?> componentClass;
 	// lazily computed based on 'properties' field: invalidate by setting to null when properties are modified
@@ -307,11 +308,11 @@ public class Component extends SimpleValue implements MetaAttributable, Sortable
 		this.parentAggregateColumn = parentAggregateColumn;
 	}
 
-	public String getStructName() {
+	public QualifiedName getStructName() {
 		return structName;
 	}
 
-	public void setStructName(String structName) {
+	public void setStructName(QualifiedName structName) {
 		this.structName = structName;
 	}
 

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/CollectionPart.java

@@ -87,6 +87,8 @@ public interface CollectionPart extends ValuedModelPart, Fetchable, JavaTypedExp
 
 	Nature getNature();
 
+	PluralAttributeMapping getCollectionAttribute();
+
 	@Override
 	default String getPartName() {
 		return getNature().getName();

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/EmbeddableMappingType.java

@@ -12,9 +12,11 @@ import java.util.function.BiConsumer;
 
 import org.hibernate.internal.util.IndexedConsumer;
 import org.hibernate.internal.util.MutableInteger;
+import org.hibernate.metamodel.mapping.internal.DiscriminatedAssociationAttributeMapping;
 import org.hibernate.metamodel.mapping.internal.EmbeddedAttributeMapping;
 import org.hibernate.metamodel.mapping.internal.MappingModelCreationProcess;
 import org.hibernate.metamodel.spi.EmbeddableInstantiator;
+import org.hibernate.metamodel.mapping.internal.ToOneAttributeMapping;
 import org.hibernate.metamodel.spi.EmbeddableRepresentationStrategy;
 import org.hibernate.property.access.spi.Getter;
 import org.hibernate.spi.NavigablePath;
@@ -156,9 +158,43 @@ public interface EmbeddableMappingType extends ManagedMappingType, SelectableMap
 		int count = 0;
 		for ( int i = 0; i < numberOfAttributeMappings; i++ ) {
 			final AttributeMapping attributeMapping = getAttributeMapping( i );
-			final MappingType mappedType = attributeMapping.getMappedType();
-			if ( mappedType instanceof EmbeddableMappingType ) {
-				final EmbeddableMappingType embeddableMappingType = (EmbeddableMappingType) mappedType;
+			if ( attributeMapping instanceof DiscriminatedAssociationAttributeMapping ) {
+				final DiscriminatedAssociationAttributeMapping discriminatedAssociationAttributeMapping = (DiscriminatedAssociationAttributeMapping) attributeMapping;
+				if ( count == columnIndex ) {
+					return discriminatedAssociationAttributeMapping.getDiscriminatorMapping();
+				}
+				count++;
+				if ( count == columnIndex ) {
+					return discriminatedAssociationAttributeMapping.getKeyPart();
+				}
+				count++;
+			}
+			else if ( attributeMapping instanceof ToOneAttributeMapping ) {
+				final ToOneAttributeMapping toOneAttributeMapping = (ToOneAttributeMapping) attributeMapping;
+				if ( toOneAttributeMapping.getSideNature() == ForeignKeyDescriptor.Nature.KEY ) {
+					final ValuedModelPart keyPart = toOneAttributeMapping.getForeignKeyDescriptor().getKeyPart();
+					if ( keyPart instanceof BasicValuedMapping ) {
+						if ( count == columnIndex ) {
+							return (SelectableMapping) keyPart;
+						}
+						count++;
+					}
+					else if ( keyPart instanceof EmbeddableValuedModelPart ) {
+						final EmbeddableMappingType mappingType = ( (EmbeddableValuedModelPart) keyPart ).getEmbeddableTypeDescriptor();
+						final SelectableMapping selectable = mappingType.getJdbcValueSelectable( columnIndex - count );
+						if ( selectable != null ) {
+							return selectable;
+						}
+						count += mappingType.getJdbcValueCount();
+					}
+					else {
+						throw new UnsupportedOperationException( "Unsupported foreign key part: " + keyPart );
+					}
+				}
+			}
+			else if ( attributeMapping instanceof EmbeddableValuedModelPart ) {
+				final EmbeddableValuedModelPart embeddableValuedModelPart = (EmbeddableValuedModelPart) attributeMapping;
+				final EmbeddableMappingType embeddableMappingType = embeddableValuedModelPart.getMappedType();
 				final SelectableMapping aggregateMapping = embeddableMappingType.getAggregateMapping();
 				if ( aggregateMapping == null ) {
 					final SelectableMapping subSelectable = embeddableMappingType.getJdbcValueSelectable( columnIndex - count );
@@ -176,8 +212,11 @@ public interface EmbeddableMappingType extends ManagedMappingType, SelectableMap
 			}
 			else {
 				if ( count == columnIndex ) {
+					if ( attributeMapping instanceof SelectableMapping ) {
 						return (SelectableMapping) attributeMapping;
 					}
+					assert attributeMapping.getJdbcTypeCount() == 0;
+				}
 				count += attributeMapping.getJdbcTypeCount();
 			}
 		}

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/PluralAttributeMapping.java

@@ -138,7 +138,7 @@ public interface PluralAttributeMapping
 			TableGroup parentTableGroup,
 			String resultVariable,
 			DomainResultCreationState creationState) {
-		return new BasicResult( 0, null, getJavaType() );
+		return new BasicResult( 0, null, getJavaType(), null, null, false, false );
 	}
 
 	String getSeparateCollectionTable();

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/AbstractDiscriminatorMapping.java

@@ -13,7 +13,6 @@ import org.hibernate.engine.spi.SharedSessionContractImplementor;
 import org.hibernate.internal.util.IndexedConsumer;
 import org.hibernate.metamodel.mapping.DiscriminatorConverter;
 import org.hibernate.metamodel.mapping.DiscriminatorType;
-import org.hibernate.metamodel.mapping.DiscriminatorValueDetails;
 import org.hibernate.metamodel.mapping.EntityDiscriminatorMapping;
 import org.hibernate.metamodel.mapping.EntityMappingType;
 import org.hibernate.metamodel.mapping.JdbcMapping;
@@ -124,7 +123,9 @@ public abstract class AbstractDiscriminatorMapping implements EntityDiscriminato
 				resultVariable,
 				discriminatorType.getJavaTypeDescriptor(),
 				discriminatorType.getValueConverter(),
-				navigablePath
+				navigablePath,
+				false,
+				!sqlSelection.isVirtual()
 		);
 	}
 
@@ -175,7 +176,10 @@ public abstract class AbstractDiscriminatorMapping implements EntityDiscriminato
 				this,
 				discriminatorType.getValueConverter(),
 				fetchTiming,
-				creationState
+				true,
+				creationState,
+				false,
+				!sqlSelection.isVirtual()
 		);
 	}
 

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/AbstractEntityCollectionPart.java

@@ -120,6 +120,11 @@ public abstract class AbstractEntityCollectionPart implements EntityCollectionPa
 		return nature;
 	}
 
+	@Override
+	public PluralAttributeMapping getCollectionAttribute() {
+		return collectionDescriptor.getAttributeMapping();
+	}
+
 	@Override
 	public String getFetchableName() {
 		return nature.getName();

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/AnyDiscriminatorPart.java

@@ -37,7 +37,6 @@ import org.hibernate.sql.ast.tree.from.TableGroup;
 import org.hibernate.sql.ast.tree.from.TableReference;
 import org.hibernate.sql.results.graph.DomainResult;
 import org.hibernate.sql.results.graph.DomainResultCreationState;
-import org.hibernate.sql.results.graph.Fetch;
 import org.hibernate.sql.results.graph.FetchOptions;
 import org.hibernate.sql.results.graph.FetchParent;
 import org.hibernate.sql.results.graph.basic.BasicFetch;
@@ -59,6 +58,8 @@ public class AnyDiscriminatorPart implements DiscriminatorMapping, FetchOptions
 
 	private final String table;
 	private final String column;
+	private final String customReadExpression;
+	private final String customWriteExpression;
 	private final String columnDefinition;
 	private final Long length;
 	private final Integer precision;
@@ -75,7 +76,7 @@ public class AnyDiscriminatorPart implements DiscriminatorMapping, FetchOptions
 			NavigableRole partRole,
 			DiscriminatedAssociationModelPart declaringType,
 			String table,
-			String column,
+			String column, String customReadExpression, String customWriteExpression,
 			String columnDefinition,
 			Long length,
 			Integer precision,
@@ -90,6 +91,8 @@ public class AnyDiscriminatorPart implements DiscriminatorMapping, FetchOptions
 		this.declaringType = declaringType;
 		this.table = table;
 		this.column = column;
+		this.customReadExpression = customReadExpression;
+		this.customWriteExpression = customWriteExpression;
 		this.columnDefinition = columnDefinition;
 		this.length = length;
 		this.precision = precision;
@@ -160,12 +163,12 @@ public class AnyDiscriminatorPart implements DiscriminatorMapping, FetchOptions
 
 	@Override
 	public String getCustomReadExpression() {
-		return null;
+		return customReadExpression;
 	}
 
 	@Override
 	public String getCustomWriteExpression() {
-		return null;
+		return customWriteExpression;
 	}
 
 	@Override
@@ -326,7 +329,8 @@ public class AnyDiscriminatorPart implements DiscriminatorMapping, FetchOptions
 				fetchablePath,
 				this,
 				fetchTiming,
-				creationState
+				creationState,
+				!sqlSelection.isVirtual()
 		);
 	}
 
@@ -351,7 +355,9 @@ public class AnyDiscriminatorPart implements DiscriminatorMapping, FetchOptions
 				sqlSelection.getValuesArrayPosition(),
 				resultVariable,
 				jdbcMapping(),
-				navigablePath
+				navigablePath,
+				false,
+				!sqlSelection.isVirtual()
 		);
 	}
 

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/AnyKeyPart.java

@@ -48,6 +48,8 @@ public class AnyKeyPart implements BasicValuedModelPart, FetchOptions {
 	private final String table;
 	private final String column;
 	private final DiscriminatedAssociationModelPart anyPart;
+	private final String customReadExpression;
+	private final String customWriteExpression;
 	private final String columnDefinition;
 	private final Long length;
 	private final Integer precision;
@@ -63,6 +65,8 @@ public class AnyKeyPart implements BasicValuedModelPart, FetchOptions {
 			DiscriminatedAssociationModelPart anyPart,
 			String table,
 			String column,
+			String customReadExpression,
+			String customWriteExpression,
 			String columnDefinition,
 			Long length,
 			Integer precision,
@@ -76,6 +80,8 @@ public class AnyKeyPart implements BasicValuedModelPart, FetchOptions {
 		this.table = table;
 		this.column = column;
 		this.anyPart = anyPart;
+		this.customReadExpression = customReadExpression;
+		this.customWriteExpression = customWriteExpression;
 		this.columnDefinition = columnDefinition;
 		this.length = length;
 		this.precision = precision;
@@ -124,12 +130,12 @@ public class AnyKeyPart implements BasicValuedModelPart, FetchOptions {
 
 	@Override
 	public String getCustomReadExpression() {
-		return null;
+		return customReadExpression;
 	}
 
 	@Override
 	public String getCustomWriteExpression() {
-		return null;
+		return customWriteExpression;
 	}
 
 	@Override
@@ -242,7 +248,8 @@ public class AnyKeyPart implements BasicValuedModelPart, FetchOptions {
 				fetchablePath,
 				this,
 				fetchTiming,
-				creationState
+				creationState,
+				!sqlSelection.isVirtual()
 		);
 	}
 
@@ -333,7 +340,9 @@ public class AnyKeyPart implements BasicValuedModelPart, FetchOptions {
 				sqlSelection.getValuesArrayPosition(),
 				resultVariable,
 				jdbcMapping,
-				navigablePath
+				navigablePath,
+				false,
+				!sqlSelection.isVirtual()
 		);
 	}
 

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/BasicAttributeMapping.java

@@ -337,7 +337,9 @@ public class BasicAttributeMapping
 				sqlSelection.getValuesArrayPosition(),
 				resultVariable,
 				jdbcMapping,
-				navigablePath
+				navigablePath,
+				false,
+				!sqlSelection.isVirtual()
 		);
 	}
 
@@ -391,10 +393,12 @@ public class BasicAttributeMapping
 			DomainResultCreationState creationState) {
 		final int valuesArrayPosition;
 		boolean coerceResultType = false;
+		final SqlSelection sqlSelection;
 		if ( fetchTiming == FetchTiming.DELAYED && isLazy ) {
 			// Lazy property. A valuesArrayPosition of -1 will lead to
 			// returning a domain result assembler that returns LazyPropertyInitializer.UNFETCHED_PROPERTY
 			valuesArrayPosition = -1;
+			sqlSelection = null;
 		}
 		else {
 			final SqlAstCreationState sqlAstCreationState = creationState.getSqlAstCreationState();
@@ -404,7 +408,7 @@ public class BasicAttributeMapping
 
 			assert tableGroup != null;
 
-			final SqlSelection sqlSelection = resolveSqlSelection(
+			sqlSelection = resolveSqlSelection(
 					fetchablePath,
 					tableGroup,
 					fetchParent,
@@ -422,9 +426,12 @@ public class BasicAttributeMapping
 				fetchParent,
 				fetchablePath,
 				this,
+				getJdbcMapping().getValueConverter(),
 				fetchTiming,
+				true,
 				creationState,
-				coerceResultType
+				coerceResultType,
+				sqlSelection != null && !sqlSelection.isVirtual()
 		);
 	}
 

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/BasicEntityIdentifierMappingImpl.java

@@ -231,7 +231,9 @@ public class BasicEntityIdentifierMappingImpl implements BasicEntityIdentifierMa
 				sqlSelection.getValuesArrayPosition(),
 				resultVariable,
 				entityPersister.getIdentifierMapping().getSingleJdbcMapping(),
-				navigablePath
+				navigablePath,
+				false,
+				!sqlSelection.isVirtual()
 		);
 	}
 
@@ -425,10 +427,13 @@ public class BasicEntityIdentifierMappingImpl implements BasicEntityIdentifierMa
 				fetchParent,
 				fetchablePath,
 				this,
+				getJdbcMapping().getValueConverter(),
 				FetchTiming.IMMEDIATE,
+				true,
 				creationState,
 				// if the expression type is different that the expected type coerce the value
-				selectionType != null && selectionType.getSingleJdbcMapping().getJdbcJavaType() != getJdbcMapping().getJdbcJavaType()
+				selectionType != null && selectionType.getSingleJdbcMapping().getJdbcJavaType() != getJdbcMapping().getJdbcJavaType(),
+				!sqlSelection.isVirtual()
 		);
 	}
 

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/BasicValuedCollectionPart.java

@@ -17,6 +17,7 @@ import org.hibernate.metamodel.mapping.CollectionPart;
 import org.hibernate.metamodel.mapping.EntityMappingType;
 import org.hibernate.metamodel.mapping.JdbcMapping;
 import org.hibernate.metamodel.mapping.MappingType;
+import org.hibernate.metamodel.mapping.PluralAttributeMapping;
 import org.hibernate.metamodel.mapping.SelectableConsumer;
 import org.hibernate.metamodel.mapping.SelectableMapping;
 import org.hibernate.metamodel.model.domain.NavigableRole;
@@ -66,6 +67,11 @@ public class BasicValuedCollectionPart
 		return nature;
 	}
 
+	@Override
+	public PluralAttributeMapping getCollectionAttribute() {
+		return collectionDescriptor.getAttributeMapping();
+	}
+
 	@Override
 	public MappingType getPartMappingType() {
 		return selectableMapping.getJdbcMapping()::getJavaTypeDescriptor;
@@ -168,7 +174,9 @@ public class BasicValuedCollectionPart
 				sqlSelection.getValuesArrayPosition(),
 				resultVariable,
 				selectableMapping.getJdbcMapping(),
-				navigablePath
+				navigablePath,
+				false,
+				!sqlSelection.isVirtual()
 		);
 	}
 
@@ -280,7 +288,8 @@ public class BasicValuedCollectionPart
 				fetchablePath,
 				this,
 				FetchTiming.IMMEDIATE,
-				creationState
+				creationState,
+				!sqlSelection.isVirtual()
 		);
 	}
 

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/CollectionIdentifierDescriptorImpl.java

@@ -18,6 +18,7 @@ import org.hibernate.metamodel.mapping.CollectionIdentifierDescriptor;
 import org.hibernate.metamodel.mapping.EntityMappingType;
 import org.hibernate.metamodel.mapping.JdbcMapping;
 import org.hibernate.metamodel.mapping.MappingType;
+import org.hibernate.metamodel.mapping.PluralAttributeMapping;
 import org.hibernate.metamodel.mapping.SelectableConsumer;
 import org.hibernate.metamodel.model.domain.NavigableRole;
 import org.hibernate.persister.collection.CollectionPersister;
@@ -65,6 +66,11 @@ public class CollectionIdentifierDescriptorImpl implements CollectionIdentifierD
 		return Nature.ID;
 	}
 
+	@Override
+	public PluralAttributeMapping getCollectionAttribute() {
+		return collectionDescriptor.getAttributeMapping();
+	}
+
 	@Override
 	public String getContainingTableExpression() {
 		return containingTableName;
@@ -278,7 +284,8 @@ public class CollectionIdentifierDescriptorImpl implements CollectionIdentifierD
 				fetchablePath,
 				this,
 				FetchTiming.IMMEDIATE,
-				creationState
+				creationState,
+				!sqlSelection.isVirtual()
 		);
 	}
 
@@ -305,7 +312,9 @@ public class CollectionIdentifierDescriptorImpl implements CollectionIdentifierD
 				sqlSelection.getValuesArrayPosition(),
 				null,
 				type,
-				collectionPath
+				collectionPath,
+				false,
+				!sqlSelection.isVirtual()
 		);
 	}
 

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/DiscriminatedAssociationMapping.java

@@ -80,6 +80,8 @@ public class DiscriminatedAssociationMapping implements MappingType, FetchOption
 				declaringModelPart,
 				tableName,
 				metaColumn.getText( dialect ),
+				metaColumn.getCustomReadExpression(),
+				metaColumn.getCustomWriteExpression(),
 				metaColumn.getSqlType(),
 				metaColumn.getLength(),
 				metaColumn.getPrecision(),
@@ -99,6 +101,8 @@ public class DiscriminatedAssociationMapping implements MappingType, FetchOption
 				declaringModelPart,
 				tableName,
 				keyColumn.getText( dialect ),
+				keyColumn.getCustomReadExpression(),
+				keyColumn.getCustomWriteExpression(),
 				keyColumn.getSqlType(),
 				keyColumn.getLength(),
 				keyColumn.getPrecision(),

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/DiscriminatedCollectionPart.java

@@ -22,6 +22,7 @@ import org.hibernate.metamodel.mapping.EntityMappingType;
 import org.hibernate.metamodel.mapping.JdbcMapping;
 import org.hibernate.metamodel.mapping.MappingType;
 import org.hibernate.metamodel.mapping.ModelPart;
+import org.hibernate.metamodel.mapping.PluralAttributeMapping;
 import org.hibernate.metamodel.mapping.SelectableConsumer;
 import org.hibernate.metamodel.mapping.SelectableMapping;
 import org.hibernate.metamodel.model.domain.NavigableRole;
@@ -80,6 +81,11 @@ public class DiscriminatedCollectionPart implements DiscriminatedAssociationMode
 		return nature;
 	}
 
+	@Override
+	public PluralAttributeMapping getCollectionAttribute() {
+		return collectionDescriptor.getAttributeMapping();
+	}
+
 	@Override
 	public DiscriminatorMapping getDiscriminatorMapping() {
 		return associationMapping.getDiscriminatorPart();

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/EmbeddableMappingTypeImpl.java

@@ -292,7 +292,7 @@ public class EmbeddableMappingTypeImpl extends AbstractEmbeddableMapping impleme
 			case STRUCT_TABLE:
 				isArray = true;
 				aggregateSqlTypeCode = STRUCT;
-				structTypeName = bootDescriptor.getStructName();
+				structTypeName = bootDescriptor.getStructName().render();
 				if ( structTypeName == null ) {
 					final String arrayTypeName = aggregateColumn.getSqlType( creationContext.getMetadata() );
 					if ( arrayTypeName.endsWith( " array" ) ) {
@@ -322,7 +322,7 @@ public class EmbeddableMappingTypeImpl extends AbstractEmbeddableMapping impleme
 		);
 		// Register the resolved type under its struct name and java class name
 		if ( bootDescriptor.getStructName() != null ) {
-			basicTypeRegistry.register( basicType, bootDescriptor.getStructName() );
+			basicTypeRegistry.register( basicType, bootDescriptor.getStructName().render() );
 			basicTypeRegistry.register( basicType, getMappedJavaType().getJavaTypeClass().getName() );
 		}
 		final BasicValue basicValue = (BasicValue) aggregateColumn.getValue();

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/EmbeddedCollectionPart.java

@@ -94,6 +94,11 @@ public class EmbeddedCollectionPart implements CollectionPart, EmbeddableValuedF
 		this.sqlAliasStem = sqlAliasStem;
 	}
 
+	@Override
+	public PluralAttributeMapping getCollectionAttribute() {
+		return collectionDescriptor.getAttributeMapping();
+	}
+
 	@Override
 	public <T> DomainResult<T> createDomainResult(
 			NavigablePath navigablePath,

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/EntityRowIdMappingImpl.java

@@ -108,7 +108,9 @@ public class EntityRowIdMappingImpl implements EntityRowIdMapping {
 				sqlSelection.getValuesArrayPosition(),
 				resultVariable,
 				rowIdType,
-				navigablePath
+				navigablePath,
+				false,
+				!sqlSelection.isVirtual()
 		);
 	}
 

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/EntityVersionMappingImpl.java

@@ -263,7 +263,8 @@ public class EntityVersionMappingImpl implements EntityVersionMapping, FetchOpti
 				fetchablePath,
 				this,
 				fetchTiming,
-				creationState
+				creationState,
+				!sqlSelection.isVirtual()
 		);
 	}
 
@@ -279,7 +280,9 @@ public class EntityVersionMappingImpl implements EntityVersionMapping, FetchOpti
 				sqlSelection.getValuesArrayPosition(),
 				resultVariable,
 				versionBasicType,
-				navigablePath
+				navigablePath,
+				false,
+				!sqlSelection.isVirtual()
 		);
 	}
 

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/SimpleForeignKeyDescriptor.java

@@ -384,8 +384,10 @@ public class SimpleForeignKeyDescriptor implements ForeignKeyDescriptor, BasicVa
 				sqlSelection.getValuesArrayPosition(),
 				null,
 				selectableMapping.getJdbcMapping(),
+				navigablePath,
 				// if the expression type is different that the expected type coerce the value
-				selectionType != null && selectionType.getSingleJdbcMapping().getJdbcJavaType() != javaType
+				selectionType != null && selectionType.getSingleJdbcMapping().getJdbcJavaType() != javaType,
+				!sqlSelection.isVirtual()
 		);
 	}
 

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/SoftDeleteMappingImpl.java

@@ -163,7 +163,14 @@ public class SoftDeleteMappingImpl implements SoftDeleteMapping {
 			String resultVariable,
 			DomainResultCreationState creationState) {
 		final SqlSelection sqlSelection = resolveSqlSelection( navigablePath, tableGroup, creationState );
-		return new BasicResult<>( sqlSelection.getValuesArrayPosition(), resultVariable, getJdbcMapping() );
+		return new BasicResult<>(
+				sqlSelection.getValuesArrayPosition(),
+				resultVariable,
+				getJdbcMapping(),
+				navigablePath,
+				false,
+				!sqlSelection.isVirtual()
+		);
 	}
 
 	private SqlSelection resolveSqlSelection(

hibernate-core/src/main/java/org/hibernate/procedure/internal/ScalarDomainResultBuilder.java

@@ -18,6 +18,7 @@ import org.hibernate.sql.ast.spi.SqlSelection;
 import org.hibernate.sql.results.graph.DomainResult;
 import org.hibernate.sql.results.graph.DomainResultCreationState;
 import org.hibernate.sql.results.graph.basic.BasicResult;
+import org.hibernate.sql.results.graph.basic.BasicResultAssembler;
 import org.hibernate.sql.results.jdbc.spi.JdbcValuesMetadata;
 import org.hibernate.type.BasicType;
 import org.hibernate.type.descriptor.java.JavaType;
@@ -69,7 +70,10 @@ public class ScalarDomainResultBuilder<T> implements ResultBuilder {
 		return new BasicResult<>(
 				sqlSelection.getValuesArrayPosition(),
 				null,
-				( (BasicType<?>) sqlSelection.getExpressionType() )
+				(BasicType<?>) sqlSelection.getExpressionType(),
+				null,
+				false,
+				false
 		);
 	}
 

hibernate-core/src/main/java/org/hibernate/query/derived/AnonymousTupleBasicValuedModelPart.java

@@ -218,7 +218,9 @@ public class AnonymousTupleBasicValuedModelPart implements OwnedValuedModelPart,
 				sqlSelection.getValuesArrayPosition(),
 				resultVariable,
 				jdbcMapping,
-				navigablePath
+				navigablePath,
+				false,
+				!sqlSelection.isVirtual()
 		);
 	}
 
@@ -270,7 +272,8 @@ public class AnonymousTupleBasicValuedModelPart implements OwnedValuedModelPart,
 				fetchablePath,
 				this,
 				fetchTiming,
-				creationState
+				creationState,
+				!sqlSelection.isVirtual()
 		);
 	}
 

hibernate-core/src/main/java/org/hibernate/query/results/ResultSetMappingImpl.java

@@ -31,6 +31,7 @@ import org.hibernate.query.results.dynamic.DynamicFetchBuilderLegacy;
 import org.hibernate.sql.ast.spi.SqlSelection;
 import org.hibernate.sql.results.graph.DomainResult;
 import org.hibernate.sql.results.graph.basic.BasicResult;
+import org.hibernate.sql.results.graph.basic.BasicResultAssembler;
 import org.hibernate.sql.results.graph.entity.EntityResult;
 import org.hibernate.sql.results.jdbc.spi.JdbcValuesMapping;
 import org.hibernate.sql.results.jdbc.spi.JdbcValuesMappingProducer;
@@ -328,7 +329,10 @@ public class ResultSetMappingImpl implements ResultSetMapping {
 		return new BasicResult(
 				valuesArrayPosition,
 				name,
-				jdbcMapping
+				jdbcMapping,
+				null,
+				false,
+				false
 		);
 	}
 

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

@@ -13,9 +13,7 @@ import org.hibernate.query.results.ResultsHelper;
 import org.hibernate.spi.NavigablePath;
 import org.hibernate.query.results.DomainResultCreationStateImpl;
 import org.hibernate.query.results.ResultBuilder;
-import org.hibernate.query.results.ResultSetMappingSqlSelection;
 import org.hibernate.query.results.dynamic.DynamicFetchBuilderLegacy;
-import org.hibernate.sql.ast.spi.SqlExpressionResolver;
 import org.hibernate.sql.ast.spi.SqlSelection;
 import org.hibernate.sql.ast.tree.from.TableGroup;
 import org.hibernate.sql.ast.tree.from.TableReference;
@@ -24,7 +22,6 @@ import org.hibernate.sql.results.graph.basic.BasicResult;
 import org.hibernate.sql.results.jdbc.spi.JdbcValuesMetadata;
 
 import static org.hibernate.query.results.ResultsHelper.impl;
-import static org.hibernate.query.results.ResultsHelper.jdbcPositionToValuesArrayPosition;
 
 /**
  * CompleteResultBuilder for basic-valued ModelParts
@@ -93,7 +90,10 @@ public class CompleteResultBuilderBasicModelPart
 		return new BasicResult<>(
 				sqlSelection.getValuesArrayPosition(),
 				columnAlias,
-				modelPart.getJdbcMapping()
+				modelPart.getJdbcMapping(),
+				navigablePath,
+				false,
+				!sqlSelection.isVirtual()
 		);
 	}
 

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

@@ -111,7 +111,10 @@ public class CompleteResultBuilderBasicValuedConverted<O,R> implements CompleteR
 				sqlSelection.getValuesArrayPosition(),
 				columnName,
 				valueConverter.getDomainJavaType(),
-				valueConverter
+				valueConverter,
+				null,
+				false,
+				false
 		);
 	}
 

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

@@ -112,7 +112,10 @@ public class CompleteResultBuilderBasicValuedStandard implements CompleteResultB
 		return new BasicResult<>(
 				sqlSelection.getValuesArrayPosition(),
 				columnName,
-				jdbcMapping
+				jdbcMapping,
+				null,
+				false,
+				false
 		);
 	}
 

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

@@ -19,6 +19,7 @@ import org.hibernate.query.results.dynamic.DynamicFetchBuilderLegacy;
 import org.hibernate.sql.results.graph.DomainResultCreationState;
 import org.hibernate.sql.results.graph.FetchParent;
 import org.hibernate.sql.results.graph.basic.BasicFetch;
+import org.hibernate.sql.results.graph.basic.BasicResultAssembler;
 import org.hibernate.sql.results.jdbc.spi.JdbcValuesMetadata;
 
 /**
@@ -69,7 +70,9 @@ public class DelayedFetchBuilderBasicPart
 				null,
 				FetchTiming.DELAYED,
 				isEnhancedForLazyLoading,
-				domainResultCreationState
+				domainResultCreationState,
+				false,
+				false
 		);
 	}
 

hibernate-core/src/main/java/org/hibernate/query/results/dynamic/DynamicResultBuilderAttribute.java

@@ -14,7 +14,6 @@ import org.hibernate.metamodel.mapping.internal.BasicAttributeMapping;
 import org.hibernate.query.NativeQuery;
 import org.hibernate.query.results.DomainResultCreationStateImpl;
 import org.hibernate.query.results.ResultSetMappingSqlSelection;
-import org.hibernate.query.results.ResultsHelper;
 import org.hibernate.sql.ast.spi.SqlExpressionResolver;
 import org.hibernate.sql.ast.spi.SqlSelection;
 import org.hibernate.sql.results.graph.DomainResult;
@@ -103,7 +102,10 @@ public class DynamicResultBuilderAttribute implements DynamicResultBuilder, Nati
 		return new BasicResult<>(
 				sqlSelection.getValuesArrayPosition(),
 				columnAlias,
-				attributeMapping.getJdbcMapping()
+				attributeMapping.getJdbcMapping(),
+				null,
+				false,
+				!sqlSelection.isVirtual()
 		);
 	}
 

hibernate-core/src/main/java/org/hibernate/query/results/dynamic/DynamicResultBuilderBasicConverted.java

@@ -141,7 +141,10 @@ public class DynamicResultBuilderBasicConverted<O,R> implements DynamicResultBui
 				sqlSelection.getValuesArrayPosition(),
 				columnAlias,
 				basicValueConverter.getDomainJavaType(),
-				basicValueConverter
+				basicValueConverter,
+				null,
+				false,
+				false
 		);
 	}
 

hibernate-core/src/main/java/org/hibernate/query/results/dynamic/DynamicResultBuilderBasicStandard.java

@@ -180,7 +180,15 @@ public class DynamicResultBuilderBasicStandard implements DynamicResultBuilderBa
 		// StandardRowReader expects there to be a JavaType as part of the ResultAssembler.
 		assert javaType != null;
 
-		return new BasicResult( sqlSelection.getValuesArrayPosition(), resultAlias, javaType, converter );
+		return new BasicResult(
+				sqlSelection.getValuesArrayPosition(),
+				resultAlias,
+				javaType,
+				converter,
+				null,
+				false,
+				false
+		);
 	}
 
 	@Override

hibernate-core/src/main/java/org/hibernate/query/results/implicit/ImplicitFetchBuilderBasic.java

@@ -17,7 +17,6 @@ import org.hibernate.query.results.BasicValuedFetchBuilder;
 import org.hibernate.query.results.DomainResultCreationStateImpl;
 import org.hibernate.query.results.FetchBuilder;
 import org.hibernate.query.results.ResultsHelper;
-import org.hibernate.query.results.ResultSetMappingSqlSelection;
 import org.hibernate.query.results.dynamic.DynamicFetchBuilderLegacy;
 import org.hibernate.sql.ast.spi.SqlSelection;
 import org.hibernate.sql.ast.tree.expression.Expression;
@@ -28,7 +27,6 @@ import org.hibernate.sql.results.graph.basic.BasicFetch;
 import org.hibernate.sql.results.jdbc.spi.JdbcValuesMetadata;
 
 import static org.hibernate.query.results.ResultsHelper.impl;
-import static org.hibernate.query.results.ResultsHelper.jdbcPositionToValuesArrayPosition;
 import static org.hibernate.sql.ast.spi.SqlExpressionResolver.createColumnReferenceKey;
 
 /**
@@ -118,7 +116,8 @@ public class ImplicitFetchBuilderBasic implements ImplicitFetchBuilder, BasicVal
 				fetchPath,
 				fetchable,
 				FetchTiming.IMMEDIATE,
-				domainResultCreationState
+				domainResultCreationState,
+				!sqlSelection.isVirtual()
 		);
 	}
 

hibernate-core/src/main/java/org/hibernate/query/sqm/function/SelfRenderingFunctionSqlAstExpression.java

@@ -174,7 +174,10 @@ public class SelfRenderingFunctionSqlAstExpression
 						.getValuesArrayPosition(),
 				resultVariable,
 				type == null ? null : type.getExpressibleJavaType(),
-				converter
+				converter,
+				null,
+				false,
+				false
 		);
 	}
 

hibernate-core/src/main/java/org/hibernate/query/sqm/mutation/internal/ExpressionDomainResultProducer.java

@@ -15,6 +15,7 @@ import org.hibernate.sql.ast.tree.expression.Expression;
 import org.hibernate.sql.results.graph.DomainResult;
 import org.hibernate.sql.results.graph.DomainResultCreationState;
 import org.hibernate.sql.results.graph.basic.BasicResult;
+import org.hibernate.sql.results.graph.basic.BasicResultAssembler;
 
 /**
  * A wrapper around a basic {@link Expression} that produces a {@link BasicResult} as domain result.
@@ -33,7 +34,9 @@ public class ExpressionDomainResultProducer implements DomainResultProducer<Obje
 				sqlSelection.getValuesArrayPosition(),
 				resultVariable,
 				expression.getExpressionType().getSingleJdbcMapping(),
-				null
+				null,
+				false,
+				false
 		);
 	}
 

hibernate-core/src/main/java/org/hibernate/query/sqm/mutation/internal/temptable/InsertExecutionDelegate.java

@@ -78,6 +78,7 @@ import org.hibernate.sql.exec.spi.JdbcOperationQueryMutation;
 import org.hibernate.sql.exec.spi.JdbcOperationQuerySelect;
 import org.hibernate.sql.exec.spi.JdbcParameterBindings;
 import org.hibernate.sql.results.graph.basic.BasicFetch;
+import org.hibernate.sql.results.graph.basic.BasicResultAssembler;
 import org.hibernate.sql.results.internal.SqlSelectionImpl;
 import org.hibernate.sql.results.spi.ListResultsConsumer;
 import org.hibernate.type.descriptor.ValueBinder;
@@ -402,7 +403,8 @@ public class InsertExecutionDelegate implements TableBasedInsertHandler.Executio
 									null,
 									identifierMapping,
 									FetchTiming.IMMEDIATE,
-									null
+									null,
+									false
 							)
 					)
 			);

hibernate-core/src/main/java/org/hibernate/query/sqm/sql/internal/SqlAstQueryPartProcessingStateImpl.java

@@ -105,14 +105,17 @@ public class SqlAstQueryPartProcessingStateImpl
 			else {
 				throw new IllegalArgumentException( "Illegal expression passed for nested fetching: " + expression );
 			}
+			final int selectableIndex = nestingFetchParent.getReferencedMappingType().getSelectableIndex( selectableName );
+			if ( selectableIndex != -1 ) {
 				return expression.createSqlSelection(
 						-1,
-					nestingFetchParent.getReferencedMappingType().getSelectableIndex( selectableName ),
+						selectableIndex,
 						javaType,
 						true,
 						typeConfiguration
 				);
 			}
+		}
 		final Map<Expression, Object> selectionMap;
 		if ( deduplicateSelectionItems ) {
 			if ( sqlSelectionMap == null ) {

hibernate-core/src/main/java/org/hibernate/query/sqm/sql/internal/SqmParameterInterpretation.java

@@ -108,7 +108,10 @@ public class SqmParameterInterpretation implements Expression, DomainResultProdu
 				sqlSelection.getValuesArrayPosition(),
 				resultVariable,
 				jdbcMapping.getMappedJavaType(),
-				converter
+				converter,
+				null,
+				false,
+				false
 		);
 	}
 

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

@@ -38,26 +38,6 @@ public class BasicFetch<T> implements Fetch, BasicResultGraphNode<T> {
 
 	private final FetchTiming fetchTiming;
 
-	public BasicFetch(
-			int valuesArrayPosition,
-			FetchParent fetchParent,
-			NavigablePath fetchablePath,
-			BasicValuedModelPart valuedMapping,
-			FetchTiming fetchTiming,
-			DomainResultCreationState creationState) {
-		//noinspection unchecked
-		this(
-				valuesArrayPosition,
-				fetchParent,
-				fetchablePath,
-				valuedMapping,
-				(BasicValueConverter<T, ?>) valuedMapping.getJdbcMapping().getValueConverter(),
-				fetchTiming,
-				true,
-				creationState
-		);
-	}
-
 	public BasicFetch(
 			int valuesArrayPosition,
 			FetchParent fetchParent,
@@ -65,7 +45,7 @@ public class BasicFetch<T> implements Fetch, BasicResultGraphNode<T> {
 			BasicValuedModelPart valuedMapping,
 			FetchTiming fetchTiming,
 			DomainResultCreationState creationState,
-			boolean coerceResultType) {
+			boolean unwrapRowProcessingState) {
 		//noinspection unchecked
 		this(
 				valuesArrayPosition,
@@ -76,49 +56,8 @@ public class BasicFetch<T> implements Fetch, BasicResultGraphNode<T> {
 				fetchTiming,
 				true,
 				creationState,
-				coerceResultType
-		);
-	}
-
-	public BasicFetch(
-			int valuesArrayPosition,
-			FetchParent fetchParent,
-			NavigablePath fetchablePath,
-			BasicValuedModelPart valuedMapping,
-			BasicValueConverter<T, ?> valueConverter,
-			FetchTiming fetchTiming,
-			DomainResultCreationState creationState) {
-		this(
-				valuesArrayPosition,
-				fetchParent,
-				fetchablePath,
-				valuedMapping,
-				valueConverter,
-				fetchTiming,
-				true,
-				creationState
-		);
-	}
-
-	public BasicFetch(
-			int valuesArrayPosition,
-			FetchParent fetchParent,
-			NavigablePath fetchablePath,
-			BasicValuedModelPart valuedMapping,
-			BasicValueConverter<T, ?> valueConverter,
-			FetchTiming fetchTiming,
-			boolean canBasicPartFetchBeDelayed,
-			DomainResultCreationState creationState) {
-		this(
-				valuesArrayPosition,
-				fetchParent,
-				fetchablePath,
-				valuedMapping,
-				valueConverter,
-				fetchTiming,
-				canBasicPartFetchBeDelayed,
-				creationState,
-				false
+				false,
+				unwrapRowProcessingState
 		);
 	}
 
@@ -131,7 +70,8 @@ public class BasicFetch<T> implements Fetch, BasicResultGraphNode<T> {
 			FetchTiming fetchTiming,
 			boolean canBasicPartFetchBeDelayed,
 			DomainResultCreationState creationState,
-			boolean coerceResultType) {
+			boolean coerceResultType,
+			boolean unwrapRowProcessingState) {
 		this.navigablePath = fetchablePath;
 
 		this.fetchParent = fetchParent;
@@ -149,10 +89,10 @@ public class BasicFetch<T> implements Fetch, BasicResultGraphNode<T> {
 		}
 		else {
 			if (coerceResultType) {
-				this.assembler = new CoercingResultAssembler<>( valuesArrayPosition, javaType, valueConverter );
+				this.assembler = new CoercingResultAssembler<>( valuesArrayPosition, javaType, valueConverter, unwrapRowProcessingState );
 			}
 			else {
-				this.assembler = new BasicResultAssembler<>( valuesArrayPosition, javaType, valueConverter );
+				this.assembler = new BasicResultAssembler<>( valuesArrayPosition, javaType, valueConverter, unwrapRowProcessingState );
 			}
 		}
 	}

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

@@ -40,7 +40,9 @@ public class BasicResult<T> implements DomainResult<T>, BasicResultGraphNode<T>
 				jdbcValuesArrayPosition,
 				resultVariable,
 				jdbcMapping,
-				null
+				null,
+				false,
+				false
 		);
 	}
 
@@ -48,81 +50,38 @@ public class BasicResult<T> implements DomainResult<T>, BasicResultGraphNode<T>
 			int jdbcValuesArrayPosition,
 			String resultVariable,
 			JdbcMapping jdbcMapping,
-			boolean coerceResultType) {
+			NavigablePath navigablePath,
+			boolean coerceResultType,
+			boolean unwrapRowProcessingState) {
 		//noinspection unchecked
 		this(
 				jdbcValuesArrayPosition,
 				resultVariable,
 				jdbcMapping.getJavaTypeDescriptor(),
 				jdbcMapping.getValueConverter(),
-				null,
-				coerceResultType
+				navigablePath,
+				coerceResultType,
+				unwrapRowProcessingState
 		);
 	}
 
-	public BasicResult(
-			int jdbcValuesArrayPosition,
-			String resultVariable,
-			JdbcMapping jdbcMapping,
-			NavigablePath navigablePath) {
-		//noinspection unchecked
-		this(
-				jdbcValuesArrayPosition,
-				resultVariable,
-				(JavaType<T>) jdbcMapping.getJavaTypeDescriptor(),
-				(BasicValueConverter<T, ?>) jdbcMapping.getValueConverter(),
-				navigablePath
-		);
-	}
-
-	public BasicResult(
-			int jdbcValuesArrayPosition,
-			String resultVariable,
-			JavaType<T> javaType) {
-		this( jdbcValuesArrayPosition, resultVariable, javaType, null, null );
-	}
-
-	public BasicResult(
-			int jdbcValuesArrayPosition,
-			String resultVariable,
-			JavaType<T> javaType,
-			NavigablePath navigablePath) {
-		this( jdbcValuesArrayPosition, resultVariable, javaType, null, navigablePath );
-	}
-
-	public BasicResult(
-			int valuesArrayPosition,
-			String resultVariable,
-			JavaType<T> javaType,
-			BasicValueConverter<T,?> valueConverter) {
-		this( valuesArrayPosition, resultVariable, javaType, valueConverter, null );
-	}
-
-	public BasicResult(
-			int valuesArrayPosition,
-			String resultVariable,
-			JavaType<T> javaType,
-			BasicValueConverter<T,?> valueConverter,
-			NavigablePath navigablePath) {
-		this( valuesArrayPosition, resultVariable, javaType, valueConverter, navigablePath, false );
-	}
-
 	public BasicResult(
 			int valuesArrayPosition,
 			String resultVariable,
 			JavaType<T> javaType,
 			BasicValueConverter<T,?> valueConverter,
 			NavigablePath navigablePath,
-			boolean coerceResultType) {
+			boolean coerceResultType,
+			boolean unwrapRowProcessingState) {
 		this.resultVariable = resultVariable;
 		this.javaType = javaType;
 		this.navigablePath = navigablePath;
 
 		if ( coerceResultType ) {
-			this.assembler = new CoercingResultAssembler<>( valuesArrayPosition, javaType, valueConverter );
+			this.assembler = new CoercingResultAssembler<>( valuesArrayPosition, javaType, valueConverter, unwrapRowProcessingState );
 		}
 		else {
-			this.assembler = new BasicResultAssembler<>( valuesArrayPosition, javaType, valueConverter );
+			this.assembler = new BasicResultAssembler<>( valuesArrayPosition, javaType, valueConverter, unwrapRowProcessingState );
 		}
 	}
 

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

@@ -29,26 +29,30 @@ public class BasicResultAssembler<J> implements DomainResultAssembler<J> {
 	protected final int valuesArrayPosition;
 	protected final JavaType<J> assembledJavaType;
 	private final BasicValueConverter<J,?> valueConverter;
+	private final boolean unwrapRowProcessingState;
 
-	public BasicResultAssembler(
-			int valuesArrayPosition,
-			JavaType<J> assembledJavaType) {
-		this( valuesArrayPosition, assembledJavaType, null );
+	public BasicResultAssembler(int valuesArrayPosition, JavaType<J> assembledJavaType) {
+		this( valuesArrayPosition, assembledJavaType, null, false );
 	}
 
 	public BasicResultAssembler(
 			int valuesArrayPosition,
 			JavaType<J> assembledJavaType,
-			BasicValueConverter<J, ?> valueConverter) {
+			BasicValueConverter<J, ?> valueConverter,
+			boolean unwrapRowProcessingState) {
 		this.valuesArrayPosition = valuesArrayPosition;
 		this.assembledJavaType = assembledJavaType;
 		this.valueConverter = valueConverter;
+		this.unwrapRowProcessingState = unwrapRowProcessingState;
 	}
 
 	/**
 	 * Access to the raw value (unconverted, if a converter applied)
 	 */
 	public Object extractRawValue(RowProcessingState rowProcessingState) {
+		if ( unwrapRowProcessingState ) {
+			rowProcessingState = rowProcessingState.unwrap();
+		}
 		return rowProcessingState.getJdbcValue( valuesArrayPosition );
 	}
 

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

@@ -21,8 +21,9 @@ public class CoercingResultAssembler<J> extends BasicResultAssembler<J> {
 	public CoercingResultAssembler(
 			int valuesArrayPosition,
 			JavaType<J> assembledJavaType,
-			BasicValueConverter<J, ?> valueConverter) {
-		super( valuesArrayPosition, assembledJavaType, valueConverter );
+			BasicValueConverter<J, ?> valueConverter,
+			boolean nestedInAggregateComponent) {
+		super( valuesArrayPosition, assembledJavaType, valueConverter, nestedInAggregateComponent );
 	}
 
 	/**
@@ -31,7 +32,7 @@ public class CoercingResultAssembler<J> extends BasicResultAssembler<J> {
 	@Override
 	public Object extractRawValue(RowProcessingState rowProcessingState) {
 		return assembledJavaType.coerce(
-				rowProcessingState.getJdbcValue( valuesArrayPosition ),
+				super.extractRawValue( rowProcessingState ),
 				rowProcessingState.getSession()
 		);
 	}

hibernate-core/src/main/java/org/hibernate/sql/results/graph/embeddable/internal/EmbeddableExpressionResultImpl.java

@@ -74,7 +74,8 @@ public class EmbeddableExpressionResultImpl<T> extends AbstractFetchParent imple
 							resolveNavigablePath( attribute ),
 							attribute,
 							FetchTiming.IMMEDIATE,
-							creationState
+							creationState,
+							!sqlSelection.isVirtual()
 					)
 			);
 		}

hibernate-core/src/main/java/org/hibernate/sql/results/graph/embeddable/internal/NestedRowProcessingState.java

@@ -49,6 +49,11 @@ public class NestedRowProcessingState extends BaseExecutionContext implements Ro
 		return jdbcValue == null ? null : jdbcValue[position];
 	}
 
+	@Override
+	public RowProcessingState unwrap() {
+		return processingState;
+	}
+
 	// -- delegate the rest
 
 	@Override

hibernate-core/src/main/java/org/hibernate/sql/results/jdbc/spi/RowProcessingState.java

@@ -68,4 +68,12 @@ public interface RowProcessingState extends ExecutionContext {
 		finishRowProcessing();
 	}
 
+	/**
+	 * If this is a row processing state for aggregate components,
+	 * this will return the underlying row processing state.
+	 */
+	default RowProcessingState unwrap() {
+		return this;
+	}
+
 }

hibernate-core/src/main/java/org/hibernate/type/descriptor/java/BooleanJavaType.java

@@ -76,7 +76,7 @@ public class BooleanJavaType extends AbstractClassJavaType<Boolean> implements
 		if ( value == null ) {
 			return null;
 		}
-		if ( Boolean.class.isAssignableFrom( type ) ) {
+		if ( Boolean.class.isAssignableFrom( type ) || type == Object.class ) {
 			return (X) value;
 		}
 		if ( Byte.class.isAssignableFrom( type ) ) {

hibernate-core/src/main/java/org/hibernate/type/descriptor/java/ByteJavaType.java

@@ -47,7 +47,7 @@ public class ByteJavaType extends AbstractClassJavaType<Byte>
 		if ( value == null ) {
 			return null;
 		}
-		if ( Byte.class.isAssignableFrom( type ) ) {
+		if ( Byte.class.isAssignableFrom( type ) || type == Object.class ) {
 			return (X) value;
 		}
 		if ( Short.class.isAssignableFrom( type ) ) {

hibernate-core/src/main/java/org/hibernate/type/descriptor/java/CharacterJavaType.java

@@ -44,7 +44,7 @@ public class CharacterJavaType extends AbstractClassJavaType<Character> implemen
 		if ( value == null ) {
 			return null;
 		}
-		if ( Character.class.isAssignableFrom( type ) ) {
+		if ( Character.class.isAssignableFrom( type ) || type == Object.class ) {
 			return (X) value;
 		}
 		if ( String.class.isAssignableFrom( type ) ) {

hibernate-core/src/main/java/org/hibernate/type/descriptor/java/DoubleJavaType.java

@@ -51,7 +51,7 @@ public class DoubleJavaType extends AbstractClassJavaType<Double> implements
 		if ( value == null ) {
 			return null;
 		}
-		if ( Double.class.isAssignableFrom( type ) ) {
+		if ( Double.class.isAssignableFrom( type ) || type == Object.class ) {
 			return (X) value;
 		}
 		if ( Float.class.isAssignableFrom( type ) ) {

hibernate-core/src/main/java/org/hibernate/type/descriptor/java/FloatJavaType.java

@@ -50,7 +50,7 @@ public class FloatJavaType extends AbstractClassJavaType<Float> implements Primi
 		if ( value == null ) {
 			return null;
 		}
-		if ( Float.class.isAssignableFrom( type ) ) {
+		if ( Float.class.isAssignableFrom( type ) || type == Object.class ) {
 			return (X) value;
 		}
 		if ( Double.class.isAssignableFrom( type ) ) {

hibernate-core/src/main/java/org/hibernate/type/descriptor/java/IntegerJavaType.java

@@ -47,7 +47,7 @@ public class IntegerJavaType extends AbstractClassJavaType<Integer>
 		if ( value == null ) {
 			return null;
 		}
-		if ( Integer.class.isAssignableFrom( type ) ) {
+		if ( Integer.class.isAssignableFrom( type ) || type == Object.class ) {
 			return (X) value;
 		}
 		if ( Byte.class.isAssignableFrom( type ) ) {

hibernate-core/src/main/java/org/hibernate/type/descriptor/java/LongJavaType.java

@@ -47,7 +47,7 @@ public class LongJavaType extends AbstractClassJavaType<Long>
 		if ( value == null ) {
 			return null;
 		}
-		if ( Long.class.isAssignableFrom( type ) ) {
+		if ( Long.class.isAssignableFrom( type ) || type == Object.class ) {
 			return (X) value;
 		}
 		if ( Byte.class.isAssignableFrom( type ) ) {

hibernate-core/src/main/java/org/hibernate/type/descriptor/java/ShortJavaType.java

@@ -57,7 +57,7 @@ public class ShortJavaType extends AbstractClassJavaType<Short>
 		if ( value == null ) {
 			return null;
 		}
-		if ( Short.class.isAssignableFrom( type ) ) {
+		if ( Short.class.isAssignableFrom( type ) || type == Object.class ) {
 			return (X) value;
 		}
 		if ( Byte.class.isAssignableFrom( type ) ) {

hibernate-core/src/main/java/org/hibernate/type/descriptor/jdbc/ArrayJdbcType.java

@@ -20,7 +20,6 @@ import org.hibernate.dialect.StructHelper;
 import org.hibernate.engine.jdbc.Size;
 import org.hibernate.engine.spi.SharedSessionContractImplementor;
 import org.hibernate.metamodel.mapping.EmbeddableMappingType;
-import org.hibernate.metamodel.spi.EmbeddableInstantiator;
 import org.hibernate.type.BasicPluralType;
 import org.hibernate.type.descriptor.ValueBinder;
 import org.hibernate.type.descriptor.ValueExtractor;
@@ -107,23 +106,58 @@ public class ArrayJdbcType implements JdbcType {
 
 	@Override
 	public Class<?> getPreferredJavaTypeClass(WrapperOptions options) {
-		return java.sql.Array.class;
+		return Object[].class;
 	}
 
-	protected Object[] getArray(BasicBinder<?> binder, Object value, WrapperOptions options) throws SQLException {
+	protected String getElementTypeName(JavaType<?> javaType, SharedSessionContractImplementor session) {
+		// TODO: ideally, we would have the actual size or the actual type/column accessible
+		//       this is something that we would need for supporting composite types anyway
+		if ( elementJdbcType instanceof StructJdbcType ) {
+			return ( (StructJdbcType) elementJdbcType ).getStructTypeName();
+		}
+		final JavaType<?> elementJavaType;
+		if ( javaType instanceof ByteArrayJavaType ) {
+			// Special handling needed for Byte[], because that would conflict with the VARBINARY mapping
+			elementJavaType = ByteJavaType.INSTANCE;
+		}
+		else {
+			elementJavaType = ( (BasicPluralJavaType<?>) javaType ).getElementJavaType();
+		}
+		final Size size = session.getJdbcServices()
+				.getDialect()
+				.getSizeStrategy()
+				.resolveSize( elementJdbcType, elementJavaType, null, null, null );
+		final DdlTypeRegistry ddlTypeRegistry = session.getTypeConfiguration().getDdlTypeRegistry();
+		final String typeName = ddlTypeRegistry.getDescriptor( elementJdbcType.getDdlTypeCode() )
+				.getTypeName( size, new BasicTypeImpl<>( elementJavaType, elementJdbcType), ddlTypeRegistry );
+		int cutIndex = typeName.indexOf( '(' );
+		if ( cutIndex > 0 ) {
+			// getTypeName for this case required length, etc, parameters.
+			// Cut them out and use database defaults.
+			return typeName.substring( 0, cutIndex );
+		}
+		else {
+			return typeName;
+		}
+	}
+
+	protected Object[] getArray(
+			BasicBinder<?> binder,
+			ValueBinder<Object> elementBinder,
+			Object value,
+			WrapperOptions options) throws SQLException {
 		final JdbcType elementJdbcType = ( (ArrayJdbcType) binder.getJdbcType() ).getElementJdbcType();
 		//noinspection unchecked
 		final JavaType<Object> javaType = (JavaType<Object>) binder.getJavaType();
 		if ( elementJdbcType instanceof AggregateJdbcType ) {
-			final AggregateJdbcType aggregateJdbcType = (AggregateJdbcType) elementJdbcType;
-			final Object[] domainObjects = ( javaType ).unwrap(
+			final Object[] domainObjects = javaType.unwrap(
 					value,
 					Object[].class,
 					options
 			);
 			final Object[] objects = new Object[domainObjects.length];
 			for ( int i = 0; i < domainObjects.length; i++ ) {
-				objects[i] = aggregateJdbcType.createJdbcValue( domainObjects[i], options );
+				objects[i] = elementBinder.getBindValue( domainObjects[i], options );
 			}
 			return objects;
 		}
@@ -174,6 +208,8 @@ public class ArrayJdbcType implements JdbcType {
 
 	@Override
 	public <X> ValueBinder<X> getBinder(final JavaType<X> javaTypeDescriptor) {
+		//noinspection unchecked
+		final ValueBinder<Object> elementBinder = elementJdbcType.getBinder( ( (BasicPluralJavaType<Object>) javaTypeDescriptor ).getElementJavaType() );
 		return new BasicBinder<>( javaTypeDescriptor, this ) {
 
 			@Override
@@ -193,49 +229,20 @@ public class ArrayJdbcType implements JdbcType {
 				}
 			}
 
+			@Override
+			public Object getBindValue(X value, WrapperOptions options) throws SQLException {
+				return ( (ArrayJdbcType) getJdbcType() ).getArray( this, elementBinder, value, options );
+			}
+
 			private java.sql.Array getArray(X value, WrapperOptions options) throws SQLException {
-				final JdbcType elementJdbcType = ( (ArrayJdbcType) getJdbcType() ).getElementJdbcType();
-				final Object[] objects = ArrayJdbcType.this.getArray( this, value, options );
+				final ArrayJdbcType arrayJdbcType = (ArrayJdbcType) getJdbcType();
+				final Object[] objects = arrayJdbcType.getArray( this, elementBinder, value, options );
 
 				final SharedSessionContractImplementor session = options.getSession();
-				final String typeName = getElementTypeName( elementJdbcType, session );
+				final String typeName = arrayJdbcType.getElementTypeName( getJavaType(), session );
 				return session.getJdbcCoordinator().getLogicalConnection().getPhysicalConnection()
 						.createArrayOf( typeName, objects );
 			}
-
-			private String getElementTypeName(JdbcType elementJdbcType, SharedSessionContractImplementor session) {
-				// TODO: ideally, we would have the actual size or the actual type/column accessible
-				//       this is something that we would need for supporting composite types anyway
-				if ( elementJdbcType instanceof StructJdbcType ) {
-					return ( (StructJdbcType) elementJdbcType ).getStructTypeName();
-				}
-				final JavaType<X> elementJavaType;
-				if ( getJavaType() instanceof ByteArrayJavaType ) {
-					// Special handling needed for Byte[], because that would conflict with the VARBINARY mapping
-					//noinspection unchecked
-					elementJavaType = (JavaType<X>) ByteJavaType.INSTANCE;
-				}
-				else {
-					//noinspection unchecked
-					elementJavaType = ( (BasicPluralJavaType<X>) getJavaType() ).getElementJavaType();
-				}
-				final Size size = session.getJdbcServices()
-						.getDialect()
-						.getSizeStrategy()
-						.resolveSize( elementJdbcType, elementJavaType, null, null, null );
-				final DdlTypeRegistry ddlTypeRegistry = session.getTypeConfiguration().getDdlTypeRegistry();
-				final String typeName = ddlTypeRegistry.getDescriptor( elementJdbcType.getDdlTypeCode() )
-						.getTypeName( size, new BasicTypeImpl<>( elementJavaType, elementJdbcType), ddlTypeRegistry );
-				int cutIndex = typeName.indexOf( '(' );
-				if ( cutIndex > 0 ) {
-					// getTypeName for this case required length, etc, parameters.
-					// Cut them out and use database defaults.
-					return typeName.substring( 0, cutIndex );
-				}
-				else {
-					return typeName;
-				}
-			}
 		};
 	}
 
@@ -266,7 +273,7 @@ public class ArrayJdbcType implements JdbcType {
 
 	@Override
 	public String toString() {
-		return "ArrayTypeDescriptor";
+		return "ArrayTypeDescriptor(" + getElementJdbcType().toString() + ")";
 	}
 
 	/**

hibernate-core/src/test/java/org/hibernate/orm/test/component/StructComponentAssociationErrorTest.java

@@ -20,18 +20,21 @@ import jakarta.persistence.Entity;
 import jakarta.persistence.FetchType;
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
 import jakarta.persistence.ManyToOne;
 import jakarta.persistence.OneToMany;
+import jakarta.persistence.OneToOne;
 
 import static org.hamcrest.CoreMatchers.containsString;
 import static org.hamcrest.MatcherAssert.assertThat;
 
+@JiraKey( "HHH-15831" )
 @RequiresDialectFeature(feature = DialectFeatureChecks.SupportsStructAggregate.class)
-public class StructComponentCollectionErrorTest {
+@RequiresDialectFeature(feature = DialectFeatureChecks.SupportsStructuralArrays.class)
+public class StructComponentAssociationErrorTest {
 
 	@Test
-	@JiraKey( "HHH-15831" )
-	public void testError1() {
+	public void testOneToOneMappedBy() {
 		final StandardServiceRegistry ssr = ServiceRegistryUtil.serviceRegistry();
 		try {
 			new MetadataSources( ssr )
@@ -41,7 +44,7 @@ public class StructComponentCollectionErrorTest {
 			Assertions.fail( "Expected a failure" );
 		}
 		catch (MappingException ex) {
-			assertThat( ex.getMessage(), containsString( "author.favoriteBook" ) );
+			assertThat( ex.getMessage(), containsString( "authors.favoriteBook" ) );
 		}
 		finally {
 			StandardServiceRegistryBuilder.destroy( ssr );
@@ -56,19 +59,21 @@ public class StructComponentCollectionErrorTest {
 		@GeneratedValue
 		private Long id;
 		private String title;
-		private Person1 author;
+		private Person1[] authors;
+		@OneToOne(fetch = FetchType.LAZY)
+		private Book1 favoredBook;
 	}
 
 	@Embeddable
 	@Struct(name = "person_type")
 	public static class Person1 {
 		private String name;
-		@ManyToOne(fetch = FetchType.LAZY)
+		@OneToOne(mappedBy = "favoredBook", fetch = FetchType.LAZY)
 		private Book1 favoriteBook;
 	}
+
 	@Test
-	@JiraKey( "HHH-15831" )
-	public void testError2() {
+	public void testOneToManyMappedBy() {
 		final StandardServiceRegistry ssr = ServiceRegistryUtil.serviceRegistry();
 		try {
 			new MetadataSources( ssr )
@@ -78,7 +83,7 @@ public class StructComponentCollectionErrorTest {
 			Assertions.fail( "Expected a failure" );
 		}
 		catch (MappingException ex) {
-			assertThat( ex.getMessage(), containsString( "author.bookCollection" ) );
+			assertThat( ex.getMessage(), containsString( "authors.bookCollection" ) );
 		}
 		finally {
 			StandardServiceRegistryBuilder.destroy( ssr );
@@ -93,15 +98,54 @@ public class StructComponentCollectionErrorTest {
 		@GeneratedValue
 		private Long id;
 		private String title;
-		private Person2 author;
+		private Person2[] authors;
+		@ManyToOne(fetch = FetchType.LAZY)
+		private Book2 mainBook;
 	}
 
 	@Embeddable
 	@Struct(name = "person_type")
 	public static class Person2 {
 		private String name;
-		@OneToMany
+		@OneToMany(mappedBy = "mainBook")
 		private List<Book2> bookCollection;
 	}
 
+	@Test
+	public void testOneToMany() {
+		final StandardServiceRegistry ssr = ServiceRegistryUtil.serviceRegistry();
+		try {
+			new MetadataSources( ssr )
+					.addAnnotatedClass( Book3.class )
+					.getMetadataBuilder()
+					.build();
+			Assertions.fail( "Expected a failure" );
+		}
+		catch (MappingException ex) {
+			assertThat( ex.getMessage(), containsString( "authors.bookCollection" ) );
+		}
+		finally {
+			StandardServiceRegistryBuilder.destroy( ssr );
+		}
+	}
+
+
+	@Entity(name = "Book")
+	public static class Book3 {
+
+		@Id
+		@GeneratedValue
+		private Long id;
+		private String title;
+		private Person3[] authors;
+	}
+
+	@Embeddable
+	@Struct(name = "person_type")
+	public static class Person3 {
+		private String name;
+		@OneToMany
+		private List<Book3> bookCollection;
+	}
+
 }

hibernate-core/src/test/java/org/hibernate/orm/test/component/StructComponentManyToAnyTest.java

@@ -0,0 +1,153 @@
+package org.hibernate.orm.test.component;
+
+import org.hibernate.Hibernate;
+import org.hibernate.annotations.Any;
+import org.hibernate.annotations.AnyDiscriminatorValue;
+import org.hibernate.annotations.AnyKeyJavaClass;
+import org.hibernate.annotations.Struct;
+
+import org.hibernate.testing.jdbc.SharedDriverManagerTypeCacheClearingIntegrator;
+import org.hibernate.testing.orm.junit.BootstrapServiceRegistry;
+import org.hibernate.testing.orm.junit.DialectFeatureChecks;
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.RequiresDialectFeature;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Embeddable;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+@BootstrapServiceRegistry(
+		// Clear the type cache, otherwise we might run into ORA-21700: object does not exist or is marked for delete
+		integrators = SharedDriverManagerTypeCacheClearingIntegrator.class
+)
+@DomainModel(
+		annotatedClasses = {
+				StructComponentManyToAnyTest.Book.class
+		}
+)
+@SessionFactory
+@RequiresDialectFeature(feature = DialectFeatureChecks.SupportsStructAggregate.class)
+public class StructComponentManyToAnyTest {
+
+	@BeforeEach
+	public void setUp(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book1 = new Book();
+					book1.id = 1L;
+					book1.title = "Hibernate 3";
+					book1.author = new Author( "Gavin", null );
+
+					session.save( book1 );
+
+					Book book2 = new Book();
+					book2.id = 2L;
+					book2.title = "Hibernate 6";
+					book2.author = new Author( "Steve", book1 );
+
+					session.save( book2 );
+				}
+		);
+	}
+
+	@AfterEach
+	public void tearDown(SessionFactoryScope scope){
+		scope.inTransaction(
+				session ->
+						session.createQuery( "delete from Book" ).executeUpdate()
+		);
+	}
+
+	@Test
+	public void testGet(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book = session.createQuery( "from Book b where b.id = 2", Book.class ).getSingleResult();
+					assertFalse( Hibernate.isInitialized( book.author.getFavoriteBook() ) );
+					assertEquals( "Gavin", book.author.getFavoriteBook().getAuthor().getName() );
+				}
+		);
+	}
+
+	@Entity(name = "Book")
+	public static class Book {
+		@Id
+		private Long id;
+		private String title;
+		private Author author;
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+
+		public String getTitle() {
+			return title;
+		}
+
+		public void setTitle(String title) {
+			this.title = title;
+		}
+
+		public Author getAuthor() {
+			return author;
+		}
+
+		public void setAuthor(Author author) {
+			this.author = author;
+		}
+	}
+
+	@Embeddable
+	@Struct( name = "author_type")
+	public static class Author {
+
+		private String name;
+		@Any(fetch = FetchType.LAZY)
+		@AnyKeyJavaClass(Long.class)
+		@AnyDiscriminatorValue(entity = Book.class, discriminator = "B")
+		@JoinColumn(name = "favorite_book_id")
+		@Column(name = "favorite_book_type")
+		private Object favoriteBook;
+
+		public Author() {
+		}
+
+		public Author(String name, Object favoriteBook) {
+			this.name = name;
+			this.favoriteBook = favoriteBook;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+
+		public Book getFavoriteBook() {
+			return (Book) favoriteBook;
+		}
+
+		public void setFavoriteBook(Book favoriteBook) {
+			this.favoriteBook = favoriteBook;
+		}
+	}
+
+}

hibernate-core/src/test/java/org/hibernate/orm/test/component/StructComponentManyToManyMappedByTest.java

@@ -0,0 +1,173 @@
+package org.hibernate.orm.test.component;
+
+import java.util.Set;
+
+import org.hibernate.Hibernate;
+import org.hibernate.annotations.Struct;
+
+import org.hibernate.testing.jdbc.SharedDriverManagerTypeCacheClearingIntegrator;
+import org.hibernate.testing.orm.junit.BootstrapServiceRegistry;
+import org.hibernate.testing.orm.junit.DialectFeatureChecks;
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.RequiresDialectFeature;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Embeddable;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.Id;
+import jakarta.persistence.ManyToMany;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.OneToMany;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+@BootstrapServiceRegistry(
+		// Clear the type cache, otherwise we might run into ORA-21700: object does not exist or is marked for delete
+		integrators = SharedDriverManagerTypeCacheClearingIntegrator.class
+)
+@DomainModel(
+		annotatedClasses = {
+				StructComponentManyToManyMappedByTest.Book.class
+		}
+)
+@SessionFactory
+@RequiresDialectFeature(feature = DialectFeatureChecks.SupportsStructAggregate.class)
+public class StructComponentManyToManyMappedByTest {
+
+	@BeforeEach
+	public void setUp(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book1 = new Book();
+					book1.id = 1L;
+					book1.title = "Main book";
+					book1.author = new Author( "Abc" );
+
+					session.save( book1 );
+
+					Book book2 = new Book();
+					book2.id = 2L;
+					book2.title = "Second book";
+					book2.booksInSeries = Set.of( book1 );
+					book2.author = new Author( "Abc" );
+
+					session.save( book2 );
+				}
+		);
+	}
+
+	@AfterEach
+	public void tearDown(SessionFactoryScope scope){
+		scope.inTransaction(
+				session ->
+						session.createQuery( "delete from Book" ).executeUpdate()
+		);
+	}
+
+	@Test
+	public void testGet(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book = session.createQuery( "from Book b where b.id = 1", Book.class ).getSingleResult();
+					assertFalse( Hibernate.isInitialized( book.author.getBooks() ) );
+					assertEquals( "Second book", book.author.getBooks().iterator().next().getTitle() );
+				}
+		);
+	}
+
+	@Test
+	public void testJoin(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book = session.createQuery(
+							"from Book b join fetch b.author.books where b.id = 1",
+							Book.class
+					).getSingleResult();
+					assertTrue( Hibernate.isInitialized( book.author.getBooks() ) );
+					assertEquals( "Second book", book.author.getBooks().iterator().next().getTitle() );
+				}
+		);
+	}
+
+	@Entity(name = "Book")
+	public static class Book {
+		@Id
+		private Long id;
+		private String title;
+		private Author author;
+		@ManyToMany
+		private Set<Book> booksInSeries;
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+
+		public String getTitle() {
+			return title;
+		}
+
+		public void setTitle(String title) {
+			this.title = title;
+		}
+
+		public Author getAuthor() {
+			return author;
+		}
+
+		public void setAuthor(Author author) {
+			this.author = author;
+		}
+
+		public Set<Book> getBooksInSeries() {
+			return booksInSeries;
+		}
+
+		public void setBooksInSeries(Set<Book> booksInSeries) {
+			this.booksInSeries = booksInSeries;
+		}
+	}
+
+	@Embeddable
+	@Struct( name = "author_type")
+	public static class Author {
+
+		private String name;
+		@ManyToMany(mappedBy = "booksInSeries")
+		private Set<Book> books;
+
+		public Author() {
+		}
+
+		public Author(String name) {
+			this.name = name;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+
+		public Set<Book> getBooks() {
+			return books;
+		}
+
+		public void setBooks(Set<Book> books) {
+			this.books = books;
+		}
+	}
+
+}

hibernate-core/src/test/java/org/hibernate/orm/test/component/StructComponentManyToManyTest.java

@@ -0,0 +1,161 @@
+package org.hibernate.orm.test.component;
+
+import java.util.Set;
+
+import org.hibernate.Hibernate;
+import org.hibernate.annotations.Struct;
+
+import org.hibernate.testing.jdbc.SharedDriverManagerTypeCacheClearingIntegrator;
+import org.hibernate.testing.orm.junit.BootstrapServiceRegistry;
+import org.hibernate.testing.orm.junit.DialectFeatureChecks;
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.RequiresDialectFeature;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Embeddable;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.ManyToMany;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+@BootstrapServiceRegistry(
+		// Clear the type cache, otherwise we might run into ORA-21700: object does not exist or is marked for delete
+		integrators = SharedDriverManagerTypeCacheClearingIntegrator.class
+)
+@DomainModel(
+		annotatedClasses = {
+				StructComponentManyToManyTest.Book.class
+		}
+)
+@SessionFactory
+@RequiresDialectFeature(feature = DialectFeatureChecks.SupportsStructAggregate.class)
+public class StructComponentManyToManyTest {
+
+	@BeforeEach
+	public void setUp(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book1 = new Book();
+					book1.id = 1L;
+					book1.title = "Main book";
+					book1.author = new Author( "Abc", null );
+
+					session.save( book1 );
+
+					Book book2 = new Book();
+					book2.id = 2L;
+					book2.title = "Second book";
+					book2.author = new Author( "Abc", book1 );
+
+					session.save( book2 );
+				}
+		);
+	}
+
+	@AfterEach
+	public void tearDown(SessionFactoryScope scope){
+		scope.inTransaction(
+				session ->
+						session.createQuery( "delete from Book" ).executeUpdate()
+		);
+	}
+
+	@Test
+	public void testGet(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book = session.createQuery( "from Book b where b.id = 2", Book.class ).getSingleResult();
+					assertFalse( Hibernate.isInitialized( book.author.getBooks() ) );
+					assertEquals( "Main book", book.author.getBooks().iterator().next().getTitle() );
+				}
+		);
+	}
+
+	@Test
+	public void testJoin(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book = session.createQuery(
+							"from Book b join fetch b.author.books where b.id = 2",
+							Book.class
+					).getSingleResult();
+					assertTrue( Hibernate.isInitialized( book.author.getBooks() ) );
+					assertEquals( "Main book", book.author.getBooks().iterator().next().getTitle() );
+				}
+		);
+	}
+
+	@Entity(name = "Book")
+	public static class Book {
+		@Id
+		private Long id;
+		private String title;
+		private Author author;
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+
+		public String getTitle() {
+			return title;
+		}
+
+		public void setTitle(String title) {
+			this.title = title;
+		}
+
+		public Author getAuthor() {
+			return author;
+		}
+
+		public void setAuthor(Author author) {
+			this.author = author;
+		}
+
+	}
+
+	@Embeddable
+	@Struct( name = "author_type")
+	public static class Author {
+
+		private String name;
+		@ManyToMany
+		private Set<Book> books;
+
+		public Author() {
+		}
+
+		public Author(String name, Book book) {
+			this.name = name;
+			this.books = book == null ? null : Set.of( book );
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+
+		public Set<Book> getBooks() {
+			return books;
+		}
+
+		public void setBooks(Set<Book> books) {
+			this.books = books;
+		}
+	}
+
+}

hibernate-core/src/test/java/org/hibernate/orm/test/component/StructComponentManyToOneTest.java

@@ -0,0 +1,159 @@
+package org.hibernate.orm.test.component;
+
+import org.hibernate.Hibernate;
+import org.hibernate.annotations.Struct;
+
+import org.hibernate.testing.jdbc.SharedDriverManagerTypeCacheClearingIntegrator;
+import org.hibernate.testing.orm.junit.BootstrapServiceRegistry;
+import org.hibernate.testing.orm.junit.DialectFeatureChecks;
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.RequiresDialectFeature;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Embeddable;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.Id;
+import jakarta.persistence.ManyToOne;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+@BootstrapServiceRegistry(
+		// Clear the type cache, otherwise we might run into ORA-21700: object does not exist or is marked for delete
+		integrators = SharedDriverManagerTypeCacheClearingIntegrator.class
+)
+@DomainModel(
+		annotatedClasses = {
+				StructComponentManyToOneTest.Book.class
+		}
+)
+@SessionFactory
+@RequiresDialectFeature(feature = DialectFeatureChecks.SupportsStructAggregate.class)
+public class StructComponentManyToOneTest {
+
+	@BeforeEach
+	public void setUp(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book1 = new Book();
+					book1.id = 1L;
+					book1.title = "Hibernate 3";
+					book1.author = new Author( "Gavin", null );
+
+					session.save( book1 );
+
+					Book book2 = new Book();
+					book2.id = 2L;
+					book2.title = "Hibernate 6";
+					book2.author = new Author( "Steve", book1 );
+
+					session.save( book2 );
+				}
+		);
+	}
+
+	@AfterEach
+	public void tearDown(SessionFactoryScope scope){
+		scope.inTransaction(
+				session ->
+						session.createQuery( "delete from Book" ).executeUpdate()
+		);
+	}
+
+	@Test
+	public void testGet(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book = session.createQuery( "from Book b where b.id = 2", Book.class ).getSingleResult();
+					assertFalse( Hibernate.isInitialized( book.author.getFavoriteBook() ) );
+					assertEquals( "Gavin", book.author.getFavoriteBook().getAuthor().getName() );
+				}
+		);
+	}
+
+	@Test
+	public void testJoin(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book = session.createQuery(
+							"from Book b join fetch b.author.favoriteBook where b.id = 2",
+							Book.class
+					).getSingleResult();
+					assertTrue( Hibernate.isInitialized( book.author.getFavoriteBook() ) );
+					assertEquals( "Gavin", book.author.getFavoriteBook().getAuthor().getName() );
+				}
+		);
+	}
+
+	@Entity(name = "Book")
+	public static class Book {
+		@Id
+		private Long id;
+		private String title;
+		private Author author;
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+
+		public String getTitle() {
+			return title;
+		}
+
+		public void setTitle(String title) {
+			this.title = title;
+		}
+
+		public Author getAuthor() {
+			return author;
+		}
+
+		public void setAuthor(Author author) {
+			this.author = author;
+		}
+	}
+
+	@Embeddable
+	@Struct( name = "author_type")
+	public static class Author {
+
+		private String name;
+		@ManyToOne(fetch = FetchType.LAZY)
+		private Book favoriteBook;
+
+		public Author() {
+		}
+
+		public Author(String name, Book favoriteBook) {
+			this.name = name;
+			this.favoriteBook = favoriteBook;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+
+		public Book getFavoriteBook() {
+			return favoriteBook;
+		}
+
+		public void setFavoriteBook(Book favoriteBook) {
+			this.favoriteBook = favoriteBook;
+		}
+	}
+
+}

hibernate-core/src/test/java/org/hibernate/orm/test/component/StructComponentOneToManyMappedByTest.java

@@ -0,0 +1,173 @@
+package org.hibernate.orm.test.component;
+
+import java.util.Set;
+
+import org.hibernate.Hibernate;
+import org.hibernate.annotations.Struct;
+
+import org.hibernate.testing.jdbc.SharedDriverManagerTypeCacheClearingIntegrator;
+import org.hibernate.testing.orm.junit.BootstrapServiceRegistry;
+import org.hibernate.testing.orm.junit.DialectFeatureChecks;
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.RequiresDialectFeature;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Embeddable;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.OneToMany;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+@BootstrapServiceRegistry(
+		// Clear the type cache, otherwise we might run into ORA-21700: object does not exist or is marked for delete
+		integrators = SharedDriverManagerTypeCacheClearingIntegrator.class
+)
+@DomainModel(
+		annotatedClasses = {
+				StructComponentOneToManyMappedByTest.Book.class
+		}
+)
+@SessionFactory
+@RequiresDialectFeature(feature = DialectFeatureChecks.SupportsStructAggregate.class)
+public class StructComponentOneToManyMappedByTest {
+
+	@BeforeEach
+	public void setUp(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book1 = new Book();
+					book1.id = 1L;
+					book1.title = "Main book";
+					book1.author = new Author( "Abc" );
+
+					session.save( book1 );
+
+					Book book2 = new Book();
+					book2.id = 2L;
+					book2.title = "Second book";
+					book2.mainBook = book1;
+					book2.author = new Author( "Abc" );
+
+					session.save( book2 );
+				}
+		);
+	}
+
+	@AfterEach
+	public void tearDown(SessionFactoryScope scope){
+		scope.inTransaction(
+				session ->
+						session.createQuery( "delete from Book" ).executeUpdate()
+		);
+	}
+
+	@Test
+	public void testGet(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book = session.createQuery( "from Book b where b.id = 1", Book.class ).getSingleResult();
+					assertFalse( Hibernate.isInitialized( book.author.getBooks() ) );
+					assertEquals( "Second book", book.author.getBooks().iterator().next().getTitle() );
+				}
+		);
+	}
+
+	@Test
+	public void testJoin(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book = session.createQuery(
+							"from Book b join fetch b.author.books where b.id = 1",
+							Book.class
+					).getSingleResult();
+					assertTrue( Hibernate.isInitialized( book.author.getBooks() ) );
+					assertEquals( "Second book", book.author.getBooks().iterator().next().getTitle() );
+				}
+		);
+	}
+
+	@Entity(name = "Book")
+	public static class Book {
+		@Id
+		private Long id;
+		private String title;
+		private Author author;
+		@ManyToOne(fetch = FetchType.LAZY)
+		private Book mainBook;
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+
+		public String getTitle() {
+			return title;
+		}
+
+		public void setTitle(String title) {
+			this.title = title;
+		}
+
+		public Author getAuthor() {
+			return author;
+		}
+
+		public void setAuthor(Author author) {
+			this.author = author;
+		}
+
+		public Book getMainBook() {
+			return mainBook;
+		}
+
+		public void setMainBook(Book mainBook) {
+			this.mainBook = mainBook;
+		}
+	}
+
+	@Embeddable
+	@Struct( name = "author_type")
+	public static class Author {
+
+		private String name;
+		@OneToMany(mappedBy = "mainBook")
+		private Set<Book> books;
+
+		public Author() {
+		}
+
+		public Author(String name) {
+			this.name = name;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+
+		public Set<Book> getBooks() {
+			return books;
+		}
+
+		public void setBooks(Set<Book> books) {
+			this.books = books;
+		}
+	}
+
+}

hibernate-core/src/test/java/org/hibernate/orm/test/component/StructComponentOneToManyTest.java

@@ -0,0 +1,161 @@
+package org.hibernate.orm.test.component;
+
+import java.util.Set;
+
+import org.hibernate.Hibernate;
+import org.hibernate.annotations.Struct;
+
+import org.hibernate.testing.jdbc.SharedDriverManagerTypeCacheClearingIntegrator;
+import org.hibernate.testing.orm.junit.BootstrapServiceRegistry;
+import org.hibernate.testing.orm.junit.DialectFeatureChecks;
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.RequiresDialectFeature;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Embeddable;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.OneToMany;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+@BootstrapServiceRegistry(
+		// Clear the type cache, otherwise we might run into ORA-21700: object does not exist or is marked for delete
+		integrators = SharedDriverManagerTypeCacheClearingIntegrator.class
+)
+@DomainModel(
+		annotatedClasses = {
+				StructComponentOneToManyTest.Book.class
+		}
+)
+@SessionFactory
+@RequiresDialectFeature(feature = DialectFeatureChecks.SupportsStructAggregate.class)
+public class StructComponentOneToManyTest {
+
+	@BeforeEach
+	public void setUp(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book1 = new Book();
+					book1.id = 1L;
+					book1.title = "Hibernate 3";
+					book1.author = new Author( "Gavin", null );
+
+					session.save( book1 );
+
+					Book book2 = new Book();
+					book2.id = 2L;
+					book2.title = "Hibernate 6";
+					book2.author = new Author( "Steve", book1 );
+
+					session.save( book2 );
+				}
+		);
+	}
+
+	@AfterEach
+	public void tearDown(SessionFactoryScope scope){
+		scope.inTransaction(
+				session ->
+						session.createQuery( "delete from Book" ).executeUpdate()
+		);
+	}
+
+	@Test
+	public void testGet(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book = session.createQuery( "from Book b where b.id = 2", Book.class ).getSingleResult();
+					assertFalse( Hibernate.isInitialized( book.author.getBooks() ) );
+					assertEquals( "Gavin", book.author.getBooks().iterator().next().getAuthor().getName() );
+				}
+		);
+	}
+
+	@Test
+	public void testJoin(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book = session.createQuery(
+							"from Book b join fetch b.author.books where b.id = 2",
+							Book.class
+					).getSingleResult();
+					assertTrue( Hibernate.isInitialized( book.author.getBooks() ) );
+					assertEquals( "Gavin", book.author.getBooks().iterator().next().getAuthor().getName() );
+				}
+		);
+	}
+
+	@Entity(name = "Book")
+	public static class Book {
+		@Id
+		private Long id;
+		private String title;
+		private Author author;
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+
+		public String getTitle() {
+			return title;
+		}
+
+		public void setTitle(String title) {
+			this.title = title;
+		}
+
+		public Author getAuthor() {
+			return author;
+		}
+
+		public void setAuthor(Author author) {
+			this.author = author;
+		}
+	}
+
+	@Embeddable
+	@Struct( name = "author_type")
+	public static class Author {
+
+		private String name;
+		@OneToMany
+		private Set<Book> books;
+
+		public Author() {
+		}
+
+		public Author(String name, Book book) {
+			this.name = name;
+			this.books = book == null ? null : Set.of( book );
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+
+		public Set<Book> getBooks() {
+			return books;
+		}
+
+		public void setBooks(Set<Book> books) {
+			this.books = books;
+		}
+	}
+
+}

hibernate-core/src/test/java/org/hibernate/orm/test/component/StructComponentOneToOneMappedByTest.java

@@ -0,0 +1,190 @@
+package org.hibernate.orm.test.component;
+
+import org.hibernate.Hibernate;
+import org.hibernate.annotations.Struct;
+
+import org.hibernate.testing.jdbc.SharedDriverManagerTypeCacheClearingIntegrator;
+import org.hibernate.testing.orm.junit.BootstrapServiceRegistry;
+import org.hibernate.testing.orm.junit.DialectFeatureChecks;
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.RequiresDialectFeature;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Embeddable;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.Id;
+import jakarta.persistence.OneToOne;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+@BootstrapServiceRegistry(
+		// Clear the type cache, otherwise we might run into ORA-21700: object does not exist or is marked for delete
+		integrators = SharedDriverManagerTypeCacheClearingIntegrator.class
+)
+@DomainModel(
+		annotatedClasses = {
+				StructComponentOneToOneMappedByTest.Book.class,
+				StructComponentOneToOneMappedByTest.BookDetails.class
+		}
+)
+@SessionFactory
+@RequiresDialectFeature(feature = DialectFeatureChecks.SupportsStructAggregate.class)
+public class StructComponentOneToOneMappedByTest {
+
+	@BeforeEach
+	public void setUp(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book = new Book();
+					BookDetails bookDetails = new BookDetails(book, "A nice book");
+					book.id = 1L;
+					book.title = "Hibernate 6";
+					book.author = new Author( "Steve", bookDetails );
+
+					session.save( book );
+					session.save( bookDetails );
+				}
+		);
+	}
+
+	@AfterEach
+	public void tearDown(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					session.createQuery( "delete from BookDetails" ).executeUpdate();
+					session.createQuery( "delete from Book" ).executeUpdate();
+				}
+		);
+	}
+
+	@Test
+	public void testGet(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book = session.createQuery( "from Book b", Book.class ).getSingleResult();
+					// One-to-one mappedBy is eager by default
+					assertTrue( Hibernate.isInitialized( book.author.getDetails() ) );
+					assertEquals( "A nice book", book.author.getDetails().getSummary() );
+				}
+		);
+	}
+
+	@Test
+	public void testJoin(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book = session.createQuery(
+							"from Book b join fetch b.author.details",
+							Book.class
+					).getSingleResult();
+					assertTrue( Hibernate.isInitialized( book.author.getDetails() ) );
+					assertEquals( "A nice book", book.author.getDetails().getSummary() );
+				}
+		);
+	}
+
+	@Entity(name = "Book")
+	public static class Book {
+		@Id
+		private Long id;
+		private String title;
+		private Author author;
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+
+		public String getTitle() {
+			return title;
+		}
+
+		public void setTitle(String title) {
+			this.title = title;
+		}
+
+		public Author getAuthor() {
+			return author;
+		}
+
+		public void setAuthor(Author author) {
+			this.author = author;
+		}
+	}
+
+	@Embeddable
+	@Struct( name = "author_type")
+	public static class Author {
+
+		private String name;
+		@OneToOne(mappedBy = "book", fetch = FetchType.LAZY)
+		private BookDetails details;
+
+		public Author() {
+		}
+
+		public Author(String name, BookDetails details) {
+			this.name = name;
+			this.details = details;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+
+		public BookDetails getDetails() {
+			return details;
+		}
+
+		public void setDetails(BookDetails details) {
+			this.details = details;
+		}
+	}
+
+	@Entity(name = "BookDetails")
+	public static class BookDetails {
+		@Id
+		@OneToOne
+		private Book book;
+		private String summary;
+
+		public BookDetails() {
+		}
+
+		public BookDetails(Book book, String summary) {
+			this.book = book;
+			this.summary = summary;
+		}
+
+		public Book getBook() {
+			return book;
+		}
+
+		public void setBook(Book book) {
+			this.book = book;
+		}
+
+		public String getSummary() {
+			return summary;
+		}
+
+		public void setSummary(String summary) {
+			this.summary = summary;
+		}
+	}
+
+}

hibernate-core/src/test/java/org/hibernate/orm/test/component/StructComponentOneToOneTest.java

@@ -0,0 +1,161 @@
+package org.hibernate.orm.test.component;
+
+import java.util.List;
+
+import org.hibernate.Hibernate;
+import org.hibernate.annotations.Struct;
+
+import org.hibernate.testing.jdbc.SharedDriverManagerTypeCacheClearingIntegrator;
+import org.hibernate.testing.orm.junit.BootstrapServiceRegistry;
+import org.hibernate.testing.orm.junit.DialectFeatureChecks;
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.RequiresDialectFeature;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Embeddable;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.Id;
+import jakarta.persistence.OneToOne;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+@BootstrapServiceRegistry(
+		// Clear the type cache, otherwise we might run into ORA-21700: object does not exist or is marked for delete
+		integrators = SharedDriverManagerTypeCacheClearingIntegrator.class
+)
+@DomainModel(
+		annotatedClasses = {
+				StructComponentOneToOneTest.Book.class
+		}
+)
+@SessionFactory
+@RequiresDialectFeature(feature = DialectFeatureChecks.SupportsStructAggregate.class)
+public class StructComponentOneToOneTest {
+
+	@BeforeEach
+	public void setUp(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book1 = new Book();
+					book1.id = 1L;
+					book1.title = "Hibernate 3";
+					book1.author = new Author( "Gavin", null );
+
+					session.save( book1 );
+
+					Book book2 = new Book();
+					book2.id = 2L;
+					book2.title = "Hibernate 6";
+					book2.author = new Author( "Steve", book1 );
+
+					session.save( book2 );
+				}
+		);
+	}
+
+	@AfterEach
+	public void tearDown(SessionFactoryScope scope){
+		scope.inTransaction(
+				session ->
+						session.createQuery( "delete from Book" ).executeUpdate()
+		);
+	}
+
+	@Test
+	public void testGet(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book = session.createQuery( "from Book b where b.id = 2", Book.class ).getSingleResult();
+					assertFalse( Hibernate.isInitialized( book.author.getFavoriteBook() ) );
+					assertEquals( "Gavin", book.author.getFavoriteBook().getAuthor().getName() );
+				}
+		);
+	}
+
+	@Test
+	public void testJoin(SessionFactoryScope scope){
+		scope.inTransaction(
+				session -> {
+					Book book = session.createQuery(
+							"from Book b join fetch b.author.favoriteBook where b.id = 2",
+							Book.class
+					).getSingleResult();
+					assertTrue( Hibernate.isInitialized( book.author.getFavoriteBook() ) );
+					assertEquals( "Gavin", book.author.getFavoriteBook().getAuthor().getName() );
+				}
+		);
+	}
+
+	@Entity(name = "Book")
+	public static class Book {
+		@Id
+		private Long id;
+		private String title;
+		private Author author;
+
+		public Long getId() {
+			return id;
+		}
+
+		public void setId(Long id) {
+			this.id = id;
+		}
+
+		public String getTitle() {
+			return title;
+		}
+
+		public void setTitle(String title) {
+			this.title = title;
+		}
+
+		public Author getAuthor() {
+			return author;
+		}
+
+		public void setAuthor(Author author) {
+			this.author = author;
+		}
+	}
+
+	@Embeddable
+	@Struct( name = "author_type")
+	public static class Author {
+
+		private String name;
+		@OneToOne(fetch = FetchType.LAZY)
+		private Book favoriteBook;
+
+		public Author() {
+		}
+
+		public Author(String name, Book favoriteBook) {
+			this.name = name;
+			this.favoriteBook = favoriteBook;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+
+		public Book getFavoriteBook() {
+			return favoriteBook;
+		}
+
+		public void setFavoriteBook(Book favoriteBook) {
+			this.favoriteBook = favoriteBook;
+		}
+	}
+
+}

hibernate-core/src/test/java/org/hibernate/orm/test/component/StructNestedComponentAssociationErrorTest.java

@@ -0,0 +1,169 @@
+package org.hibernate.orm.test.component;
+
+import java.util.List;
+
+import org.hibernate.MappingException;
+import org.hibernate.annotations.Struct;
+import org.hibernate.boot.MetadataSources;
+import org.hibernate.boot.registry.StandardServiceRegistry;
+import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
+
+import org.hibernate.testing.orm.junit.DialectFeatureChecks;
+import org.hibernate.testing.orm.junit.JiraKey;
+import org.hibernate.testing.orm.junit.RequiresDialectFeature;
+import org.hibernate.testing.util.ServiceRegistryUtil;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Embeddable;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.OneToMany;
+import jakarta.persistence.OneToOne;
+
+import static org.hamcrest.CoreMatchers.containsString;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+@JiraKey( "HHH-15831" )
+@RequiresDialectFeature(feature = DialectFeatureChecks.SupportsStructAggregate.class)
+@RequiresDialectFeature(feature = DialectFeatureChecks.SupportsStructuralArrays.class)
+public class StructNestedComponentAssociationErrorTest {
+
+	@Test
+	public void testOneToOneMappedByNested() {
+		final StandardServiceRegistry ssr = ServiceRegistryUtil.serviceRegistry();
+		try {
+			new MetadataSources( ssr )
+					.addAnnotatedClass( Book1.class )
+					.getMetadataBuilder()
+					.build();
+			Assertions.fail( "Expected a failure" );
+		}
+		catch (MappingException ex) {
+			assertThat( ex.getMessage(), containsString( "authorInfos.person.favoriteBook" ) );
+		}
+		finally {
+			StandardServiceRegistryBuilder.destroy( ssr );
+		}
+	}
+
+
+	@Entity(name = "Book")
+	public static class Book1 {
+
+		@Id
+		@GeneratedValue
+		private Long id;
+		private String title;
+		private AuthorInfo[] authorInfos;
+		@OneToOne(fetch = FetchType.LAZY)
+		private Book1 favoredBook;
+	}
+
+	@Embeddable
+	@Struct(name = "author_info_type")
+	public static class AuthorInfo {
+		Person1 person;
+	}
+
+	@Embeddable
+	@Struct(name = "person_type")
+	public static class Person1 {
+		private String name;
+		@OneToOne(mappedBy = "favoredBook", fetch = FetchType.LAZY)
+		private Book1 favoriteBook;
+	}
+
+	@Test
+	public void testOneToManyMappedByNested() {
+		final StandardServiceRegistry ssr = ServiceRegistryUtil.serviceRegistry();
+		try {
+			new MetadataSources( ssr )
+					.addAnnotatedClass( Book2.class )
+					.getMetadataBuilder()
+					.build();
+			Assertions.fail( "Expected a failure" );
+		}
+		catch (MappingException ex) {
+			assertThat( ex.getMessage(), containsString( "authorInfos.person.bookCollection" ) );
+		}
+		finally {
+			StandardServiceRegistryBuilder.destroy( ssr );
+		}
+	}
+
+
+	@Entity(name = "Book")
+	public static class Book2 {
+
+		@Id
+		@GeneratedValue
+		private Long id;
+		private String title;
+		private AuthorInfo2[] authorInfos;
+		@ManyToOne(fetch = FetchType.LAZY)
+		private Book2 mainBook;
+	}
+
+	@Embeddable
+	@Struct(name = "author_info_type")
+	public static class AuthorInfo2 {
+		Person2 person;
+	}
+
+	@Embeddable
+	@Struct(name = "person_type")
+	public static class Person2 {
+		private String name;
+		@OneToMany(mappedBy = "mainBook")
+		private List<Book2> bookCollection;
+	}
+
+
+	@Test
+	public void testOneToMany() {
+		final StandardServiceRegistry ssr = ServiceRegistryUtil.serviceRegistry();
+		try {
+			new MetadataSources( ssr )
+					.addAnnotatedClass( Book3.class )
+					.getMetadataBuilder()
+					.build();
+			Assertions.fail( "Expected a failure" );
+		}
+		catch (MappingException ex) {
+			assertThat( ex.getMessage(), containsString( "authorInfos.person.bookCollection" ) );
+		}
+		finally {
+			StandardServiceRegistryBuilder.destroy( ssr );
+		}
+	}
+
+
+	@Entity(name = "Book")
+	public static class Book3 {
+
+		@Id
+		@GeneratedValue
+		private Long id;
+		private String title;
+		private AuthorInfo3[] authorInfos;
+	}
+
+	@Embeddable
+	@Struct(name = "author_info_type")
+	public static class AuthorInfo3 {
+		Person3 person;
+	}
+
+	@Embeddable
+	@Struct(name = "person_type")
+	public static class Person3 {
+		private String name;
+		@OneToMany
+		private List<Book3> bookCollection;
+	}
+
+}