HHH-7841 - Redesign Loader

hibernate-core/src/main/java/org/hibernate/HibernateError.java

@@ -0,0 +1,43 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate;
+
+/**
+ * Marks a group of exceptions that generally indicate an internal Hibernate error or bug.
+ *
+ * @author Steve Ebersole
+ */
+public abstract class HibernateError extends HibernateException {
+	public HibernateError(String message) {
+		super( message );
+	}
+
+	public HibernateError(Throwable root) {
+		super( root );
+	}
+
+	public HibernateError(String message, Throwable root) {
+		super( message, root );
+	}
+}

hibernate-core/src/main/java/org/hibernate/hql/internal/classic/QueryTranslatorImpl.java

@@ -63,6 +63,7 @@ import org.hibernate.internal.util.ReflectHelper;
 import org.hibernate.internal.util.StringHelper;
 import org.hibernate.internal.util.collections.ArrayHelper;
 import org.hibernate.loader.BasicLoader;
+import org.hibernate.loader.spi.AfterLoadAction;
 import org.hibernate.persister.collection.CollectionPersister;
 import org.hibernate.persister.collection.QueryableCollection;
 import org.hibernate.persister.entity.Loadable;

hibernate-core/src/main/java/org/hibernate/loader/Loader.java

@@ -79,6 +79,7 @@ import org.hibernate.internal.CoreMessageLogger;
 import org.hibernate.internal.FetchingScrollableResultsImpl;
 import org.hibernate.internal.ScrollableResultsImpl;
 import org.hibernate.internal.util.StringHelper;
+import org.hibernate.loader.spi.AfterLoadAction;
 import org.hibernate.persister.collection.CollectionPersister;
 import org.hibernate.persister.entity.EntityPersister;
 import org.hibernate.persister.entity.Loadable;
@@ -245,10 +246,6 @@ public abstract class Loader {
 				: sql;
 	}
 
-	protected static interface AfterLoadAction {
-		public void afterLoad(SessionImplementor session, Object entity, Loadable persister);
-	}
-
 	protected boolean shouldUseFollowOnLocking(
 			QueryParameters parameters,
 			Dialect dialect,
@@ -509,7 +506,7 @@ public abstract class Loader {
 			}
 
 			// We call getKeyFromResultSet() here so that we can know the
-			// key value upon which to doAfterTransactionCompletion the breaking logic.  However,
+			// key value upon which to perform the breaking logic.  However,
 			// it is also then called from getRowFromResultSet() which is certainly
 			// not the most efficient.  But the call here is needed, and there
 			// currently is no other way without refactoring of the doQuery()/getRowFromResultSet()
@@ -527,7 +524,7 @@ public abstract class Loader {
 		catch ( SQLException sqle ) {
 			throw factory.getSQLExceptionHelper().convert(
 			        sqle,
-			        "could not doAfterTransactionCompletion sequential read of results (forward)",
+			        "could not perform sequential read of results (forward)",
 			        getSQLString()
 				);
 		}

hibernate-core/src/main/java/org/hibernate/loader/collection/DynamicBatchingCollectionInitializerBuilder.java

@@ -43,6 +43,7 @@ import org.hibernate.internal.util.StringHelper;
 import org.hibernate.internal.util.collections.ArrayHelper;
 import org.hibernate.loader.JoinWalker;
 import org.hibernate.loader.Loader;
+import org.hibernate.loader.spi.AfterLoadAction;
 import org.hibernate.persister.collection.QueryableCollection;
 import org.hibernate.pretty.MessageHelper;
 import org.hibernate.type.Type;

hibernate-core/src/main/java/org/hibernate/loader/criteria/CriteriaLoader.java

@@ -45,6 +45,7 @@ import org.hibernate.engine.spi.SessionImplementor;
 import org.hibernate.internal.CriteriaImpl;
 import org.hibernate.internal.util.collections.ArrayHelper;
 import org.hibernate.loader.OuterJoinLoader;
+import org.hibernate.loader.spi.AfterLoadAction;
 import org.hibernate.persister.entity.Loadable;
 import org.hibernate.persister.entity.Lockable;
 import org.hibernate.persister.entity.OuterJoinLoadable;

hibernate-core/src/main/java/org/hibernate/loader/custom/CustomLoader.java

@@ -27,7 +27,6 @@ import java.sql.ResultSet;
 import java.sql.ResultSetMetaData;
 import java.sql.SQLException;
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
@@ -41,10 +40,7 @@ import org.hibernate.QueryException;
 import org.hibernate.ScrollableResults;
 import org.hibernate.Session;
 import org.hibernate.dialect.Dialect;
-import org.hibernate.dialect.pagination.LimitHandler;
-import org.hibernate.dialect.pagination.LimitHelper;
 import org.hibernate.engine.spi.QueryParameters;
-import org.hibernate.engine.spi.RowSelection;
 import org.hibernate.engine.spi.SessionFactoryImplementor;
 import org.hibernate.engine.spi.SessionImplementor;
 import org.hibernate.hql.internal.HolderInstantiator;
@@ -53,10 +49,10 @@ import org.hibernate.internal.util.collections.ArrayHelper;
 import org.hibernate.loader.CollectionAliases;
 import org.hibernate.loader.EntityAliases;
 import org.hibernate.loader.Loader;
+import org.hibernate.loader.spi.AfterLoadAction;
 import org.hibernate.persister.collection.CollectionPersister;
 import org.hibernate.persister.collection.QueryableCollection;
 import org.hibernate.persister.entity.Loadable;
-import org.hibernate.persister.entity.Lockable;
 import org.hibernate.persister.entity.Queryable;
 import org.hibernate.transform.ResultTransformer;
 import org.hibernate.type.CollectionType;

hibernate-core/src/main/java/org/hibernate/loader/entity/DynamicBatchingEntityLoaderBuilder.java

@@ -43,6 +43,7 @@ import org.hibernate.engine.spi.SessionFactoryImplementor;
 import org.hibernate.engine.spi.SessionImplementor;
 import org.hibernate.internal.util.StringHelper;
 import org.hibernate.internal.util.collections.ArrayHelper;
+import org.hibernate.loader.spi.AfterLoadAction;
 import org.hibernate.persister.entity.OuterJoinLoadable;
 import org.hibernate.pretty.MessageHelper;
 

hibernate-core/src/main/java/org/hibernate/loader/hql/QueryLoader.java

@@ -52,6 +52,7 @@ import org.hibernate.hql.internal.ast.tree.SelectClause;
 import org.hibernate.internal.IteratorImpl;
 import org.hibernate.internal.util.collections.ArrayHelper;
 import org.hibernate.loader.BasicLoader;
+import org.hibernate.loader.spi.AfterLoadAction;
 import org.hibernate.param.ParameterSpecification;
 import org.hibernate.persister.collection.CollectionPersister;
 import org.hibernate.persister.collection.QueryableCollection;

hibernate-core/src/main/java/org/hibernate/loader/internal/OnDemandResultSetProcessorImpl.java

@@ -0,0 +1,58 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.loader.internal;
+
+import java.sql.ResultSet;
+
+import org.hibernate.engine.spi.QueryParameters;
+import org.hibernate.engine.spi.SessionImplementor;
+import org.hibernate.loader.spi.OnDemandResultSetProcessor;
+
+/**
+ * @author Steve Ebersole
+ */
+public class OnDemandResultSetProcessorImpl implements OnDemandResultSetProcessor {
+	@Override
+	public Object extractSingleRow(
+			ResultSet resultSet,
+			SessionImplementor session,
+			QueryParameters queryParameters) {
+		return null;
+	}
+
+	@Override
+	public Object extractSequentialRowsForward(
+			ResultSet resultSet, SessionImplementor session, QueryParameters queryParameters) {
+		return null;  //To change body of implemented methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public Object extractSequentialRowsReverse(
+			ResultSet resultSet,
+			SessionImplementor session,
+			QueryParameters queryParameters,
+			boolean isLogicallyAfterLast) {
+		return null;  //To change body of implemented methods use File | Settings | File Templates.
+	}
+}

hibernate-core/src/main/java/org/hibernate/loader/internal/ResultSetProcessingContextImpl.java

@@ -0,0 +1,557 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.loader.internal;
+
+import java.io.Serializable;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import org.jboss.logging.Logger;
+
+import org.hibernate.HibernateException;
+import org.hibernate.LockMode;
+import org.hibernate.StaleObjectStateException;
+import org.hibernate.WrongClassException;
+import org.hibernate.engine.internal.TwoPhaseLoad;
+import org.hibernate.engine.spi.EntityKey;
+import org.hibernate.engine.spi.EntityUniqueKey;
+import org.hibernate.engine.spi.QueryParameters;
+import org.hibernate.engine.spi.SessionImplementor;
+import org.hibernate.engine.spi.SubselectFetch;
+import org.hibernate.event.spi.EventSource;
+import org.hibernate.event.spi.PostLoadEvent;
+import org.hibernate.event.spi.PreLoadEvent;
+import org.hibernate.loader.EntityAliases;
+import org.hibernate.loader.plan.spi.CollectionFetch;
+import org.hibernate.loader.plan.spi.CollectionReturn;
+import org.hibernate.loader.plan.spi.EntityReference;
+import org.hibernate.loader.plan.spi.LoadPlan;
+import org.hibernate.loader.plan.spi.LoadPlanVisitationStrategyAdapter;
+import org.hibernate.loader.plan.spi.LoadPlanVisitor;
+import org.hibernate.loader.spi.AfterLoadAction;
+import org.hibernate.loader.spi.NamedParameterContext;
+import org.hibernate.loader.spi.ResultSetProcessingContext;
+import org.hibernate.persister.collection.CollectionPersister;
+import org.hibernate.persister.entity.EntityPersister;
+import org.hibernate.persister.entity.Loadable;
+import org.hibernate.persister.entity.UniqueKeyLoadable;
+import org.hibernate.pretty.MessageHelper;
+import org.hibernate.type.EntityType;
+import org.hibernate.type.Type;
+import org.hibernate.type.VersionType;
+
+/**
+ * @author Steve Ebersole
+ */
+public class ResultSetProcessingContextImpl implements ResultSetProcessingContext {
+	private static final Logger LOG = Logger.getLogger( ResultSetProcessingContextImpl.class );
+
+	private final ResultSet resultSet;
+	private final SessionImplementor session;
+	private final LoadPlan loadPlan;
+	private final boolean readOnly;
+	private final QueryParameters queryParameters;
+	private final NamedParameterContext namedParameterContext;
+	private final boolean hadSubselectFetches;
+
+	private final EntityKey dictatedRootEntityKey;
+
+	private List<HydratedEntityRegistration> currentRowHydratedEntityRegistrationList;
+
+	private Map<EntityPersister,Set<EntityKey>> subselectLoadableEntityKeyMap;
+	private List<HydratedEntityRegistration> hydratedEntityRegistrationList;
+
+	public ResultSetProcessingContextImpl(
+			ResultSet resultSet,
+			SessionImplementor session,
+			LoadPlan loadPlan,
+			boolean readOnly,
+			boolean useOptionalEntityKey,
+			QueryParameters queryParameters,
+			NamedParameterContext namedParameterContext,
+			boolean hadSubselectFetches) {
+		this.resultSet = resultSet;
+		this.session = session;
+		this.loadPlan = loadPlan;
+		this.readOnly = readOnly;
+		this.queryParameters = queryParameters;
+		this.namedParameterContext = namedParameterContext;
+		this.hadSubselectFetches = hadSubselectFetches;
+
+		if ( useOptionalEntityKey ) {
+			this.dictatedRootEntityKey = ResultSetProcessorHelper.getOptionalObjectKey( queryParameters, session );
+			if ( this.dictatedRootEntityKey == null ) {
+				throw new HibernateException( "Unable to resolve optional entity-key" );
+			}
+		}
+		else {
+			this.dictatedRootEntityKey = null;
+		}
+	}
+
+	@Override
+	public SessionImplementor getSession() {
+		return session;
+	}
+
+	@Override
+	public QueryParameters getQueryParameters() {
+		return queryParameters;
+	}
+
+	@Override
+	public EntityKey getDictatedRootEntityKey() {
+		return dictatedRootEntityKey;
+	}
+
+	private Map<EntityReference,IdentifierResolutionContext> identifierResolutionContextMap;
+
+	@Override
+	public IdentifierResolutionContext getIdentifierResolutionContext(final EntityReference entityReference) {
+		if ( identifierResolutionContextMap == null ) {
+			identifierResolutionContextMap = new HashMap<EntityReference, IdentifierResolutionContext>();
+		}
+		IdentifierResolutionContext context = identifierResolutionContextMap.get( entityReference );
+		if ( context == null ) {
+			context = new IdentifierResolutionContext() {
+				private Serializable hydratedForm;
+				private EntityKey entityKey;
+
+				@Override
+				public EntityReference getEntityReference() {
+					return entityReference;
+				}
+
+				@Override
+				public void registerHydratedForm(Serializable hydratedForm) {
+					if ( this.hydratedForm != null ) {
+						// this could be bad...
+					}
+					this.hydratedForm = hydratedForm;
+				}
+
+				@Override
+				public Serializable getHydratedForm() {
+					return hydratedForm;
+				}
+
+				@Override
+				public void registerEntityKey(EntityKey entityKey) {
+					if ( this.entityKey != null ) {
+						// again, could be trouble...
+					}
+					this.entityKey = entityKey;
+				}
+
+				@Override
+				public EntityKey getEntityKey() {
+					return entityKey;
+				}
+			};
+			identifierResolutionContextMap.put( entityReference, context );
+		}
+
+		return context;
+	}
+
+	@Override
+	public void checkVersion(
+			ResultSet resultSet,
+			EntityPersister persister,
+			EntityAliases entityAliases,
+			EntityKey entityKey,
+			Object entityInstance) throws SQLException {
+		final Object version = session.getPersistenceContext().getEntry( entityInstance ).getVersion();
+
+		if ( version != null ) {
+			//null version means the object is in the process of being loaded somewhere else in the ResultSet
+			VersionType versionType = persister.getVersionType();
+			Object currentVersion = versionType.nullSafeGet(
+					resultSet,
+					entityAliases.getSuffixedVersionAliases(),
+					session,
+					null
+			);
+			if ( !versionType.isEqual(version, currentVersion) ) {
+				if ( session.getFactory().getStatistics().isStatisticsEnabled() ) {
+					session.getFactory().getStatisticsImplementor()
+							.optimisticFailure( persister.getEntityName() );
+				}
+				throw new StaleObjectStateException( persister.getEntityName(), entityKey.getIdentifier() );
+			}
+		}
+	}
+
+	@Override
+	public String getConcreteEntityTypeName(
+			final ResultSet rs,
+			final EntityPersister persister,
+			final EntityAliases entityAliases,
+			final EntityKey entityKey) throws SQLException {
+
+		final Loadable loadable = (Loadable) persister;
+		if ( ! loadable.hasSubclasses() ) {
+			return persister.getEntityName();
+		}
+
+		final Object discriminatorValue = loadable.getDiscriminatorType().nullSafeGet(
+				rs,
+				entityAliases.getSuffixedDiscriminatorAlias(),
+				session,
+				null
+		);
+
+		final String result = loadable.getSubclassForDiscriminatorValue( discriminatorValue );
+
+		if ( result == null ) {
+			// whoops! we got an instance of another class hierarchy branch
+			throw new WrongClassException(
+					"Discriminator: " + discriminatorValue,
+					entityKey.getIdentifier(),
+					persister.getEntityName()
+			);
+		}
+
+		return result;
+	}
+
+	@Override
+	public void loadFromResultSet(
+			ResultSet resultSet,
+			Object entityInstance,
+			String concreteEntityTypeName,
+			EntityKey entityKey,
+			EntityAliases entityAliases,
+			LockMode acquiredLockMode,
+			EntityPersister rootPersister,
+			boolean eagerFetch,
+			EntityType associationType) throws SQLException {
+
+		final Serializable id = entityKey.getIdentifier();
+
+		// Get the persister for the _subclass_
+		final Loadable persister = (Loadable) getSession().getFactory().getEntityPersister( concreteEntityTypeName );
+
+		if ( LOG.isTraceEnabled() ) {
+			LOG.tracev(
+					"Initializing object from ResultSet: {0}",
+					MessageHelper.infoString(
+							persister,
+							id,
+							getSession().getFactory()
+					)
+			);
+		}
+
+		// add temp entry so that the next step is circular-reference
+		// safe - only needed because some types don't take proper
+		// advantage of two-phase-load (esp. components)
+		TwoPhaseLoad.addUninitializedEntity(
+				entityKey,
+				entityInstance,
+				persister,
+				acquiredLockMode,
+				!eagerFetch,
+				session
+		);
+
+		// This is not very nice (and quite slow):
+		final String[][] cols = persister == rootPersister ?
+				entityAliases.getSuffixedPropertyAliases() :
+				entityAliases.getSuffixedPropertyAliases(persister);
+
+		final Object[] values = persister.hydrate(
+				resultSet,
+				id,
+				entityInstance,
+				(Loadable) rootPersister,
+				cols,
+				eagerFetch,
+				session
+		);
+
+		final Object rowId = persister.hasRowId() ? resultSet.getObject( entityAliases.getRowIdAlias() ) : null;
+
+		if ( associationType != null ) {
+			String ukName = associationType.getRHSUniqueKeyPropertyName();
+			if ( ukName != null ) {
+				final int index = ( (UniqueKeyLoadable) persister ).getPropertyIndex( ukName );
+				final Type type = persister.getPropertyTypes()[index];
+
+				// polymorphism not really handled completely correctly,
+				// perhaps...well, actually its ok, assuming that the
+				// entity name used in the lookup is the same as the
+				// the one used here, which it will be
+
+				EntityUniqueKey euk = new EntityUniqueKey(
+						rootPersister.getEntityName(), //polymorphism comment above
+						ukName,
+						type.semiResolve( values[index], session, entityInstance ),
+						type,
+						persister.getEntityMode(),
+						session.getFactory()
+				);
+				session.getPersistenceContext().addEntity( euk, entityInstance );
+			}
+		}
+
+		TwoPhaseLoad.postHydrate(
+				persister,
+				id,
+				values,
+				rowId,
+				entityInstance,
+				acquiredLockMode,
+				!eagerFetch,
+				session
+		);
+
+	}
+
+	@Override
+	public void registerHydratedEntity(EntityPersister persister, EntityKey entityKey, Object entityInstance) {
+		if ( currentRowHydratedEntityRegistrationList == null ) {
+			currentRowHydratedEntityRegistrationList = new ArrayList<HydratedEntityRegistration>();
+		}
+		currentRowHydratedEntityRegistrationList.add( new HydratedEntityRegistration( persister, entityKey, entityInstance ) );
+	}
+
+	/**
+	 * Package-protected
+	 */
+	void finishUpRow() {
+		if ( currentRowHydratedEntityRegistrationList == null ) {
+			return;
+		}
+
+
+		// managing the running list of registrations ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+		if ( hydratedEntityRegistrationList == null ) {
+			hydratedEntityRegistrationList = new ArrayList<HydratedEntityRegistration>();
+		}
+		hydratedEntityRegistrationList.addAll( currentRowHydratedEntityRegistrationList );
+
+
+		// managing the map forms needed for subselect fetch generation ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+		if ( ! hadSubselectFetches ) {
+			return;
+		}
+		if ( subselectLoadableEntityKeyMap == null ) {
+			subselectLoadableEntityKeyMap = new HashMap<EntityPersister, Set<EntityKey>>();
+		}
+		for ( HydratedEntityRegistration registration : currentRowHydratedEntityRegistrationList ) {
+			Set<EntityKey> entityKeys = subselectLoadableEntityKeyMap.get( registration.persister );
+			if ( entityKeys == null ) {
+				entityKeys = new HashSet<EntityKey>();
+				subselectLoadableEntityKeyMap.put( registration.persister, entityKeys );
+			}
+			entityKeys.add( registration.key );
+		}
+
+		// release the currentRowHydratedEntityRegistrationList entries
+		currentRowHydratedEntityRegistrationList.clear();
+	}
+
+	/**
+	 * Package-protected
+	 *
+	 * @param afterLoadActionList List of after-load actions to perform
+	 */
+	void finishUp(List<AfterLoadAction> afterLoadActionList) {
+		initializeEntitiesAndCollections( afterLoadActionList );
+		createSubselects();
+
+		if ( hydratedEntityRegistrationList != null ) {
+			hydratedEntityRegistrationList.clear();
+			hydratedEntityRegistrationList = null;
+		}
+
+		if ( subselectLoadableEntityKeyMap != null ) {
+			subselectLoadableEntityKeyMap.clear();
+			subselectLoadableEntityKeyMap = null;
+		}
+	}
+
+	private void initializeEntitiesAndCollections(List<AfterLoadAction> afterLoadActionList) {
+		// for arrays, we should end the collection load before resolving the entities, since the
+		// actual array instances are not instantiated during loading
+		finishLoadingArrays();
+
+
+		// IMPORTANT: reuse the same event instances for performance!
+		final PreLoadEvent preLoadEvent;
+		final PostLoadEvent postLoadEvent;
+		if ( session.isEventSource() ) {
+			preLoadEvent = new PreLoadEvent( (EventSource) session );
+			postLoadEvent = new PostLoadEvent( (EventSource) session );
+		}
+		else {
+			preLoadEvent = null;
+			postLoadEvent = null;
+		}
+
+		// now finish loading the entities (2-phase load)
+		performTwoPhaseLoad( preLoadEvent, postLoadEvent );
+
+		// now we can finalize loading collections
+		finishLoadingCollections();
+
+		// finally, perform post-load operations
+		postLoad( postLoadEvent, afterLoadActionList );
+	}
+
+	private void finishLoadingArrays() {
+		LoadPlanVisitor.visit(
+				loadPlan,
+				new LoadPlanVisitationStrategyAdapter() {
+					@Override
+					public void handleCollectionReturn(CollectionReturn rootCollectionReturn) {
+						endLoadingArray( rootCollectionReturn.getCollectionPersister() );
+					}
+
+					@Override
+					public void startingCollectionFetch(CollectionFetch collectionFetch) {
+						endLoadingArray( collectionFetch.getCollectionPersister() );
+					}
+
+					private void endLoadingArray(CollectionPersister persister) {
+						if ( persister.isArray() ) {
+							session.getPersistenceContext()
+									.getLoadContexts()
+									.getCollectionLoadContext( resultSet )
+									.endLoadingCollections( persister );
+						}
+					}
+				}
+		);
+	}
+
+	private void performTwoPhaseLoad(PreLoadEvent preLoadEvent, PostLoadEvent postLoadEvent) {
+		final int numberOfHydratedObjects = hydratedEntityRegistrationList == null
+				? 0
+				: hydratedEntityRegistrationList.size();
+		LOG.tracev( "Total objects hydrated: {0}", numberOfHydratedObjects );
+
+		if ( hydratedEntityRegistrationList == null ) {
+			return;
+		}
+
+		for ( HydratedEntityRegistration registration : hydratedEntityRegistrationList ) {
+			TwoPhaseLoad.initializeEntity( registration.instance, readOnly, session, preLoadEvent, postLoadEvent );
+		}
+	}
+
+	private void finishLoadingCollections() {
+		LoadPlanVisitor.visit(
+				loadPlan,
+				new LoadPlanVisitationStrategyAdapter() {
+					@Override
+					public void handleCollectionReturn(CollectionReturn rootCollectionReturn) {
+						endLoadingArray( rootCollectionReturn.getCollectionPersister() );
+					}
+
+					@Override
+					public void startingCollectionFetch(CollectionFetch collectionFetch) {
+						endLoadingArray( collectionFetch.getCollectionPersister() );
+					}
+
+					private void endLoadingArray(CollectionPersister persister) {
+						if ( ! persister.isArray() ) {
+							session.getPersistenceContext()
+									.getLoadContexts()
+									.getCollectionLoadContext( resultSet )
+									.endLoadingCollections( persister );
+						}
+					}
+				}
+		);
+	}
+
+	private void postLoad(PostLoadEvent postLoadEvent, List<AfterLoadAction> afterLoadActionList) {
+		// Until this entire method is refactored w/ polymorphism, postLoad was
+		// split off from initializeEntity.  It *must* occur after
+		// endCollectionLoad to ensure the collection is in the
+		// persistence context.
+		if ( hydratedEntityRegistrationList == null ) {
+			return;
+		}
+
+		for ( HydratedEntityRegistration registration : hydratedEntityRegistrationList ) {
+			TwoPhaseLoad.postLoad( registration.instance, session, postLoadEvent );
+			if ( afterLoadActionList != null ) {
+				for ( AfterLoadAction afterLoadAction : afterLoadActionList ) {
+					afterLoadAction.afterLoad( session, registration.instance, (Loadable) registration.persister );
+				}
+			}
+		}
+	}
+
+	private void createSubselects() {
+		if ( subselectLoadableEntityKeyMap.size() <= 1 ) {
+			// if we only returned one entity, query by key is more efficient; so do nothing here
+			return;
+		}
+
+		final Map<String, int[]> namedParameterLocMap =
+				ResultSetProcessorHelper.buildNamedParameterLocMap( queryParameters, namedParameterContext );
+
+		for ( Map.Entry<EntityPersister, Set<EntityKey>> entry : subselectLoadableEntityKeyMap.entrySet() ) {
+			if ( ! entry.getKey().hasSubselectLoadableCollections() ) {
+				continue;
+			}
+
+			SubselectFetch subselectFetch = new SubselectFetch(
+					//getSQLString(),
+					null, // aliases[i],
+					(Loadable) entry.getKey(),
+					queryParameters,
+					entry.getValue(),
+					namedParameterLocMap
+			);
+
+			for ( EntityKey key : entry.getValue() ) {
+				session.getPersistenceContext().getBatchFetchQueue().addSubselect( key, subselectFetch );
+			}
+
+		}
+	}
+
+	private static class HydratedEntityRegistration {
+		private final EntityPersister persister;
+		private final EntityKey key;
+		private final Object instance;
+
+		private HydratedEntityRegistration(EntityPersister persister, EntityKey key, Object instance) {
+			this.persister = persister;
+			this.key = key;
+			this.instance = instance;
+		}
+	}
+}

hibernate-core/src/main/java/org/hibernate/loader/internal/ResultSetProcessorHelper.java

@@ -0,0 +1,77 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.loader.internal;
+
+import java.io.Serializable;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.hibernate.engine.spi.EntityKey;
+import org.hibernate.engine.spi.QueryParameters;
+import org.hibernate.engine.spi.SessionImplementor;
+import org.hibernate.loader.EntityAliases;
+import org.hibernate.loader.plan.spi.EntityReference;
+import org.hibernate.loader.plan.spi.Fetch;
+import org.hibernate.loader.spi.NamedParameterContext;
+import org.hibernate.loader.spi.ResultSetProcessingContext;
+import org.hibernate.persister.entity.EntityPersister;
+import org.hibernate.type.CompositeType;
+import org.hibernate.type.Type;
+
+/**
+ * @author Steve Ebersole
+ */
+public class ResultSetProcessorHelper {
+	public static EntityKey getOptionalObjectKey(QueryParameters queryParameters, SessionImplementor session) {
+		final Object optionalObject = queryParameters.getOptionalObject();
+		final Serializable optionalId = queryParameters.getOptionalId();
+		final String optionalEntityName = queryParameters.getOptionalEntityName();
+
+		if ( optionalObject != null && optionalEntityName != null ) {
+			return session.generateEntityKey( optionalId, session.getEntityPersister( optionalEntityName, optionalObject ) );
+		}
+		else {
+			return null;
+		}
+	}
+
+	public static Map<String, int[]> buildNamedParameterLocMap(
+			QueryParameters queryParameters,
+			NamedParameterContext namedParameterContext) {
+		if ( queryParameters.getNamedParameters() == null || queryParameters.getNamedParameters().isEmpty() ) {
+			return null;
+		}
+
+		final Map<String, int[]> namedParameterLocMap = new HashMap<String, int[]>();
+		for ( String name : queryParameters.getNamedParameters().keySet() ) {
+			namedParameterLocMap.put(
+					name,
+					namedParameterContext.getNamedParameterLocations( name )
+			);
+		}
+		return namedParameterLocMap;
+	}
+}

hibernate-core/src/main/java/org/hibernate/loader/internal/ResultSetProcessorImpl.java

@@ -0,0 +1,207 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.loader.internal;
+
+import java.io.Serializable;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.jboss.logging.Logger;
+
+import org.hibernate.dialect.pagination.LimitHelper;
+import org.hibernate.engine.FetchStyle;
+import org.hibernate.engine.spi.QueryParameters;
+import org.hibernate.engine.spi.RowSelection;
+import org.hibernate.engine.spi.SessionImplementor;
+import org.hibernate.loader.plan.spi.CollectionFetch;
+import org.hibernate.loader.plan.spi.CollectionReturn;
+import org.hibernate.loader.plan.spi.EntityFetch;
+import org.hibernate.loader.plan.spi.LoadPlan;
+import org.hibernate.loader.plan.spi.LoadPlanVisitationStrategyAdapter;
+import org.hibernate.loader.plan.spi.LoadPlanVisitor;
+import org.hibernate.loader.plan.spi.Return;
+import org.hibernate.loader.spi.AfterLoadAction;
+import org.hibernate.loader.spi.NamedParameterContext;
+import org.hibernate.loader.spi.OnDemandResultSetProcessor;
+import org.hibernate.loader.spi.ResultSetProcessor;
+import org.hibernate.persister.collection.CollectionPersister;
+import org.hibernate.pretty.MessageHelper;
+import org.hibernate.transform.ResultTransformer;
+
+/**
+ * @author Steve Ebersole
+ */
+public class ResultSetProcessorImpl implements ResultSetProcessor {
+	private static final Logger LOG = Logger.getLogger( ResultSetProcessorImpl.class );
+
+	private final LoadPlan loadPlan;
+
+	private final boolean hadSubselectFetches;
+
+	public ResultSetProcessorImpl(LoadPlan loadPlan) {
+		this.loadPlan = loadPlan;
+
+		LocalVisitationStrategy strategy = new LocalVisitationStrategy();
+		LoadPlanVisitor.visit( loadPlan, strategy );
+		this.hadSubselectFetches = strategy.hadSubselectFetches;
+	}
+
+	@Override
+	public OnDemandResultSetProcessor toOnDemandForm() {
+		return null;  //To change body of implemented methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public List extractResults(
+			ResultSet resultSet,
+			final SessionImplementor session,
+			QueryParameters queryParameters,
+			NamedParameterContext namedParameterContext,
+			boolean returnProxies,
+			boolean readOnly,
+			ResultTransformer forcedResultTransformer,
+			List<AfterLoadAction> afterLoadActionList) throws SQLException {
+
+		handlePotentiallyEmptyCollectionRootReturns( queryParameters.getCollectionKeys(), resultSet, session );
+
+		final int maxRows;
+		final RowSelection selection = queryParameters.getRowSelection();
+		if ( LimitHelper.hasMaxRows( selection ) ) {
+			maxRows = selection.getMaxRows();
+			LOG.tracef( "Limiting ResultSet processing to just %s rows", maxRows );
+		}
+		else {
+			maxRows = Integer.MAX_VALUE;
+		}
+
+		final ResultSetProcessingContextImpl context = new ResultSetProcessingContextImpl(
+				resultSet,
+				session,
+				loadPlan,
+				readOnly,
+				true, // use optional entity key?  for now, always say yes
+				queryParameters,
+				namedParameterContext,
+				hadSubselectFetches
+		);
+
+		final List loadResults = new ArrayList();
+
+		final int rootReturnCount = loadPlan.getReturns().size();
+
+		LOG.trace( "Processing result set" );
+		int count;
+		for ( count = 0; count < maxRows && resultSet.next(); count++ ) {
+			LOG.debugf( "Starting ResultSet row #%s", count );
+
+			Object logicalRow;
+			if ( rootReturnCount == 1 ) {
+				loadPlan.getReturns().get( 0 ).hydrate( resultSet, context );
+				loadPlan.getReturns().get( 0 ).resolve( resultSet, context );
+
+				logicalRow = loadPlan.getReturns().get( 0 ).read( resultSet, context );
+			}
+			else {
+				for ( Return rootReturn : loadPlan.getReturns() ) {
+					rootReturn.hydrate( resultSet, context );
+				}
+				for ( Return rootReturn : loadPlan.getReturns() ) {
+					rootReturn.resolve( resultSet, context );
+				}
+
+				logicalRow = new Object[ rootReturnCount ];
+				int pos = 0;
+				for ( Return rootReturn : loadPlan.getReturns() ) {
+					( (Object[]) logicalRow )[pos] = rootReturn.read( resultSet, context );
+					pos++;
+				}
+			}
+
+			// todo : apply transformers here?
+
+			loadResults.add( logicalRow );
+
+			context.finishUpRow();
+		}
+
+		LOG.tracev( "Done processing result set ({0} rows)", count );
+
+		context.finishUp( afterLoadActionList );
+
+		session.getPersistenceContext().initializeNonLazyCollections();
+
+		return loadResults;
+	}
+
+
+	private void handlePotentiallyEmptyCollectionRootReturns(
+			Serializable[] collectionKeys,
+			ResultSet resultSet,
+			SessionImplementor session) {
+		if ( collectionKeys == null ) {
+			// this is not a collection initializer (and empty collections will be detected by looking for
+			// the owner's identifier in the result set)
+			return;
+		}
+
+		// this is a collection initializer, so we must create a collection
+		// for each of the passed-in keys, to account for the possibility
+		// that the collection is empty and has no rows in the result set
+		//
+		// todo : move this inside CollectionReturn ?
+		CollectionPersister persister = ( (CollectionReturn) loadPlan.getReturns().get( 0 ) ).getCollectionPersister();
+		for ( Serializable key : collectionKeys ) {
+			if ( LOG.isDebugEnabled() ) {
+				LOG.debugf(
+						"Preparing collection intializer : %s",
+							MessageHelper.collectionInfoString( persister, key, session.getFactory() )
+				);
+				session.getPersistenceContext()
+						.getLoadContexts()
+						.getCollectionLoadContext( resultSet )
+						.getLoadingCollection( persister, key );
+			}
+		}
+	}
+
+
+	private class LocalVisitationStrategy extends LoadPlanVisitationStrategyAdapter {
+		private boolean hadSubselectFetches = false;
+
+		@Override
+		public void startingEntityFetch(EntityFetch entityFetch) {
+// only collections are currently supported for subselect fetching.
+//			hadSubselectFetches = hadSubselectFetches
+//					| entityFetch.getFetchStrategy().getStyle() == FetchStyle.SUBSELECT;
+		}
+
+		@Override
+		public void startingCollectionFetch(CollectionFetch collectionFetch) {
+			hadSubselectFetches = hadSubselectFetches
+					| collectionFetch.getFetchStrategy().getStyle() == FetchStyle.SUBSELECT;
+		}
+	}
+}

hibernate-core/src/main/java/org/hibernate/loader/plan/internal/LoadPlanBuildingHelper.java

@@ -0,0 +1,92 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.loader.plan.internal;
+
+import org.hibernate.LockMode;
+import org.hibernate.engine.FetchStrategy;
+import org.hibernate.loader.CollectionAliases;
+import org.hibernate.loader.EntityAliases;
+import org.hibernate.loader.plan.spi.AbstractFetchOwner;
+import org.hibernate.loader.plan.spi.CollectionFetch;
+import org.hibernate.loader.plan.spi.CompositeFetch;
+import org.hibernate.loader.plan.spi.EntityFetch;
+import org.hibernate.loader.plan.spi.FetchOwner;
+import org.hibernate.loader.plan.spi.LoadPlanBuildingContext;
+import org.hibernate.persister.walking.spi.AssociationAttributeDefinition;
+import org.hibernate.persister.walking.spi.CompositionDefinition;
+
+/**
+ * @author Steve Ebersole
+ */
+public class LoadPlanBuildingHelper {
+	public static CollectionFetch buildStandardCollectionFetch(
+			FetchOwner fetchOwner,
+			AssociationAttributeDefinition attributeDefinition,
+			FetchStrategy fetchStrategy,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		final CollectionAliases collectionAliases = loadPlanBuildingContext.resolveCollectionColumnAliases( attributeDefinition );
+		final EntityAliases elementEntityAliases = loadPlanBuildingContext.resolveEntityColumnAliases( attributeDefinition );
+
+		return new CollectionFetch(
+				loadPlanBuildingContext.getSessionFactory(),
+				loadPlanBuildingContext.resolveFetchSourceAlias( attributeDefinition ),
+				LockMode.NONE, // todo : for now
+				fetchOwner,
+				fetchStrategy,
+				attributeDefinition.getName(),
+				collectionAliases,
+				elementEntityAliases
+		);
+	}
+
+	public static EntityFetch buildStandardEntityFetch(
+			FetchOwner fetchOwner,
+			AssociationAttributeDefinition attributeDefinition,
+			FetchStrategy fetchStrategy,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+
+		return new EntityFetch(
+				loadPlanBuildingContext.getSessionFactory(),
+				loadPlanBuildingContext.resolveFetchSourceAlias( attributeDefinition ),
+				LockMode.NONE, // todo : for now
+				fetchOwner,
+				attributeDefinition.getName(),
+				fetchStrategy,
+				null, // sql table alias
+				loadPlanBuildingContext.resolveEntityColumnAliases( attributeDefinition )
+		);
+	}
+
+	public static CompositeFetch buildStandardCompositeFetch(
+			FetchOwner fetchOwner,
+			CompositionDefinition attributeDefinition,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		return new CompositeFetch(
+				loadPlanBuildingContext.getSessionFactory(),
+				loadPlanBuildingContext.resolveFetchSourceAlias( attributeDefinition ),
+				(AbstractFetchOwner) fetchOwner,
+				attributeDefinition.getName()
+		);
+	}
+}

hibernate-core/src/main/java/org/hibernate/loader/plan/internal/SingleRootReturnLoadPlanBuilderStrategy.java

@@ -32,26 +32,18 @@ import org.hibernate.engine.spi.LoadQueryInfluencers;
 import org.hibernate.engine.spi.SessionFactoryImplementor;
 import org.hibernate.internal.util.StringHelper;
 import org.hibernate.loader.CollectionAliases;
-import org.hibernate.loader.DefaultEntityAliases;
 import org.hibernate.loader.EntityAliases;
-import org.hibernate.loader.GeneratedCollectionAliases;
 import org.hibernate.loader.PropertyPath;
-import org.hibernate.loader.plan.spi.AbstractFetchOwner;
 import org.hibernate.loader.plan.spi.AbstractLoadPlanBuilderStrategy;
-import org.hibernate.loader.plan.spi.CollectionFetch;
 import org.hibernate.loader.plan.spi.CollectionReturn;
-import org.hibernate.loader.plan.spi.CompositeFetch;
-import org.hibernate.loader.plan.spi.EntityFetch;
 import org.hibernate.loader.plan.spi.EntityReturn;
-import org.hibernate.loader.plan.spi.FetchOwner;
 import org.hibernate.loader.plan.spi.LoadPlan;
 import org.hibernate.loader.plan.spi.LoadPlanBuilderStrategy;
 import org.hibernate.loader.plan.spi.Return;
 import org.hibernate.persister.collection.CollectionPersister;
-import org.hibernate.persister.entity.Loadable;
+import org.hibernate.persister.entity.EntityPersister;
 import org.hibernate.persister.walking.spi.AssociationAttributeDefinition;
 import org.hibernate.persister.walking.spi.CollectionDefinition;
-import org.hibernate.persister.walking.spi.CompositeDefinition;
 import org.hibernate.persister.walking.spi.EntityDefinition;
 import org.hibernate.type.EntityType;
 import org.hibernate.type.Type;
@@ -74,7 +66,6 @@ public class SingleRootReturnLoadPlanBuilderStrategy
 	private final LoadQueryInfluencers loadQueryInfluencers;
 
 	private final String rootAlias;
-	private int currentSuffixBase;
 
 	private Return rootReturn;
 
@@ -85,10 +76,9 @@ public class SingleRootReturnLoadPlanBuilderStrategy
 			LoadQueryInfluencers loadQueryInfluencers,
 			String rootAlias,
 			int suffixSeed) {
-		super( sessionFactory );
+		super( sessionFactory, suffixSeed );
 		this.loadQueryInfluencers = loadQueryInfluencers;
 		this.rootAlias = rootAlias;
-		this.currentSuffixBase = suffixSeed;
 	}
 
 	@Override
@@ -153,10 +143,7 @@ public class SingleRootReturnLoadPlanBuilderStrategy
 				LockMode.NONE, // todo : for now
 				entityName,
 				StringHelper.generateAlias( StringHelper.unqualifyEntityName( entityName ), currentDepth() ),
-				new DefaultEntityAliases(
-						(Loadable) entityDefinition.getEntityPersister(),
-						Integer.toString( currentSuffixBase++ ) + '_'
-				)
+				generateEntityColumnAliases( entityDefinition.getEntityPersister() )
 		);
 	}
 
@@ -165,17 +152,16 @@ public class SingleRootReturnLoadPlanBuilderStrategy
 		final CollectionPersister persister = collectionDefinition.getCollectionPersister();
 		final String collectionRole = persister.getRole();
 
-		final CollectionAliases collectionAliases = new GeneratedCollectionAliases(
-				collectionDefinition.getCollectionPersister(),
-				Integer.toString( currentSuffixBase++ ) + '_'
+		final CollectionAliases collectionAliases = generateCollectionColumnAliases(
+				collectionDefinition.getCollectionPersister()
 		);
+
 		final Type elementType = collectionDefinition.getCollectionPersister().getElementType();
 		final EntityAliases elementAliases;
 		if ( elementType.isEntityType() ) {
 			final EntityType entityElementType = (EntityType) elementType;
-			elementAliases = new DefaultEntityAliases(
-					(Loadable) entityElementType.getAssociatedJoinable( sessionFactory() ),
-					Integer.toString( currentSuffixBase++ ) + '_'
+			elementAliases = generateEntityColumnAliases(
+					(EntityPersister) entityElementType.getAssociatedJoinable( sessionFactory() )
 			);
 		}
 		else {
@@ -193,76 +179,16 @@ public class SingleRootReturnLoadPlanBuilderStrategy
 		);
 	}
 
-	@Override
-	protected CollectionFetch buildCollectionFetch(
-			FetchOwner fetchOwner,
-			AssociationAttributeDefinition attributeDefinition,
-			FetchStrategy fetchStrategy) {
-		final CollectionDefinition collectionDefinition = attributeDefinition.toCollectionDefinition();
-		final CollectionAliases collectionAliases = new GeneratedCollectionAliases(
-				collectionDefinition.getCollectionPersister(),
-				Integer.toString( currentSuffixBase++ ) + '_'
-		);
-		final Type elementType = collectionDefinition.getCollectionPersister().getElementType();
-		final EntityAliases elementAliases;
-		if ( elementType.isEntityType() ) {
-			final EntityType entityElementType = (EntityType) elementType;
-			elementAliases = new DefaultEntityAliases(
-					(Loadable) entityElementType.getAssociatedJoinable( sessionFactory() ),
-					Integer.toString( currentSuffixBase++ ) + '_'
-			);
-		}
-		else {
-			elementAliases = null;
-		}
 
-		return new CollectionFetch(
-				sessionFactory(),
-				createImplicitAlias(),
-				LockMode.NONE, // todo : for now
-				(AbstractFetchOwner) fetchOwner,
-				fetchStrategy,
-				attributeDefinition.getName(),
-				collectionAliases,
-				elementAliases
-		);
+	// LoadPlanBuildingContext impl ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+	@Override
+	public String resolveRootSourceAlias(EntityDefinition definition) {
+		return rootAlias;
 	}
 
 	@Override
-	protected EntityFetch buildEntityFetch(
-			FetchOwner fetchOwner,
-			AssociationAttributeDefinition attributeDefinition,
-			FetchStrategy fetchStrategy) {
-		final EntityDefinition entityDefinition = attributeDefinition.toEntityDefinition();
-
-		return new EntityFetch(
-				sessionFactory(),
-				createImplicitAlias(),
-				LockMode.NONE, // todo : for now
-				(AbstractFetchOwner) fetchOwner,
-				attributeDefinition.getName(),
-				fetchStrategy,
-				StringHelper.generateAlias( entityDefinition.getEntityPersister().getEntityName(), currentDepth() ),
-				new DefaultEntityAliases(
-						(Loadable) entityDefinition.getEntityPersister(),
-						Integer.toString( currentSuffixBase++ ) + '_'
-				)
-		);
-	}
-
-	@Override
-	protected CompositeFetch buildCompositeFetch(FetchOwner fetchOwner, CompositeDefinition attributeDefinition) {
-		return new CompositeFetch(
-				sessionFactory(),
-				createImplicitAlias(),
-				(AbstractFetchOwner) fetchOwner,
-				attributeDefinition.getName()
-		);
-	}
-
-	private int implicitAliasUniqueness = 0;
-
-	private String createImplicitAlias() {
-		return "ia" + implicitAliasUniqueness++;
+	public String resolveRootSourceAlias(CollectionDefinition definition) {
+		return rootAlias;
 	}
 }

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/AbstractCollectionReference.java

@@ -0,0 +1,143 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.loader.plan.spi;
+
+import org.hibernate.LockMode;
+import org.hibernate.engine.spi.SessionFactoryImplementor;
+import org.hibernate.loader.CollectionAliases;
+import org.hibernate.loader.EntityAliases;
+import org.hibernate.loader.PropertyPath;
+import org.hibernate.persister.collection.CollectionPersister;
+import org.hibernate.type.Type;
+
+/**
+ * @author Steve Ebersole
+ */
+public abstract class AbstractCollectionReference extends AbstractPlanNode implements CollectionReference {
+	private final String alias;
+	private final LockMode lockMode;
+	private final CollectionPersister collectionPersister;
+	private final PropertyPath propertyPath;
+
+	private final CollectionAliases collectionAliases;
+	private final EntityAliases elementEntityAliases;
+
+	private final FetchOwner indexGraph;
+	private final FetchOwner elementGraph;
+
+	protected AbstractCollectionReference(
+			SessionFactoryImplementor sessionFactory,
+			String alias,
+			LockMode lockMode,
+			CollectionPersister collectionPersister,
+			PropertyPath propertyPath,
+			CollectionAliases collectionAliases,
+			EntityAliases elementEntityAliases) {
+		super( sessionFactory );
+		this.alias = alias;
+		this.lockMode = lockMode;
+		this.collectionPersister = collectionPersister;
+		this.propertyPath = propertyPath;
+
+		this.collectionAliases = collectionAliases;
+		this.elementEntityAliases = elementEntityAliases;
+
+		this.indexGraph = buildIndexGraph( getCollectionPersister() );
+		this.elementGraph = buildElementGraph( getCollectionPersister() );
+	}
+
+	private FetchOwner buildIndexGraph(CollectionPersister persister) {
+		if ( persister.hasIndex() ) {
+			final Type type = persister.getIndexType();
+			if ( type.isAssociationType() ) {
+				if ( type.isEntityType() ) {
+					return new EntityIndexGraph( sessionFactory(), this, propertyPath() );
+				}
+			}
+			else if ( type.isComponentType() ) {
+				return new CompositeIndexGraph( sessionFactory(), this, propertyPath() );
+			}
+		}
+
+		return null;
+	}
+
+	private FetchOwner buildElementGraph(CollectionPersister persister) {
+		final Type type = persister.getElementType();
+		if ( type.isAssociationType() ) {
+			if ( type.isEntityType() ) {
+				return new EntityElementGraph( sessionFactory(), this, propertyPath() );
+			}
+		}
+		else if ( type.isComponentType() ) {
+			return new CompositeElementGraph( sessionFactory(), this, propertyPath() );
+		}
+
+		return null;
+	}
+
+	public PropertyPath propertyPath() {
+		return propertyPath;
+	}
+
+	@Override
+	public String getAlias() {
+		return alias;
+	}
+
+	@Override
+	public LockMode getLockMode() {
+		return lockMode;
+	}
+
+	@Override
+	public CollectionAliases getCollectionAliases() {
+		return collectionAliases;
+	}
+
+	@Override
+	public EntityAliases getElementEntityAliases() {
+		return elementEntityAliases;
+	}
+
+	@Override
+	public CollectionPersister getCollectionPersister() {
+		return collectionPersister;
+	}
+
+	@Override
+	public FetchOwner getIndexGraph() {
+		return indexGraph;
+	}
+
+	@Override
+	public FetchOwner getElementGraph() {
+		return elementGraph;
+	}
+
+	@Override
+	public boolean hasEntityElements() {
+		return getCollectionPersister().isOneToMany() || getCollectionPersister().isManyToMany();
+	}
+}

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/AbstractFetch.java

@@ -44,7 +44,7 @@ public abstract class AbstractFetch extends AbstractFetchOwner implements Fetch
 			SessionFactoryImplementor factory,
 			String alias,
 			LockMode lockMode,
-			AbstractFetchOwner owner,
+			FetchOwner owner,
 			String ownerProperty,
 			FetchStrategy fetchStrategy) {
 		super( factory, alias, lockMode );
@@ -85,4 +85,9 @@ public abstract class AbstractFetch extends AbstractFetchOwner implements Fetch
 	public PropertyPath getPropertyPath() {
 		return propertyPath;
 	}
+
+	@Override
+	public String toString() {
+		return "Fetch(" + propertyPath.getFullPath() + ")";
+	}
 }

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/AbstractFetchOwner.java

@@ -56,7 +56,8 @@ public abstract class AbstractFetchOwner extends AbstractPlanNode implements Fet
 		return lockMode;
 	}
 
-	void addFetch(Fetch fetch) {
+	@Override
+	public void addFetch(Fetch fetch) {
 		if ( fetch.getOwner() != this ) {
 			throw new IllegalArgumentException( "Fetch and owner did not match" );
 		}

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/AbstractLoadPlanBuilderStrategy.java

@@ -23,29 +23,62 @@
  */
 package org.hibernate.loader.plan.spi;
 
+import java.io.Serializable;
+import java.sql.ResultSet;
+import java.sql.SQLException;
 import java.util.ArrayDeque;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.jboss.logging.Logger;
 
 import org.hibernate.HibernateException;
+import org.hibernate.LockMode;
 import org.hibernate.engine.FetchStrategy;
 import org.hibernate.engine.FetchTiming;
+import org.hibernate.engine.spi.EntityKey;
 import org.hibernate.engine.spi.SessionFactoryImplementor;
+import org.hibernate.internal.util.StringHelper;
+import org.hibernate.loader.CollectionAliases;
+import org.hibernate.loader.DefaultEntityAliases;
+import org.hibernate.loader.EntityAliases;
+import org.hibernate.loader.GeneratedCollectionAliases;
+import org.hibernate.loader.PropertyPath;
+import org.hibernate.loader.plan.internal.LoadPlanBuildingHelper;
+import org.hibernate.loader.spi.ResultSetProcessingContext;
+import org.hibernate.persister.collection.CollectionPersister;
+import org.hibernate.persister.entity.EntityPersister;
+import org.hibernate.persister.entity.Loadable;
+import org.hibernate.persister.spi.HydratedCompoundValueHandler;
 import org.hibernate.persister.walking.spi.AssociationAttributeDefinition;
 import org.hibernate.persister.walking.spi.AttributeDefinition;
 import org.hibernate.persister.walking.spi.CollectionDefinition;
-import org.hibernate.persister.walking.spi.CompositeDefinition;
+import org.hibernate.persister.walking.spi.CollectionElementDefinition;
+import org.hibernate.persister.walking.spi.CollectionIndexDefinition;
+import org.hibernate.persister.walking.spi.CompositionDefinition;
 import org.hibernate.persister.walking.spi.EntityDefinition;
+import org.hibernate.persister.walking.spi.EntityIdentifierDefinition;
+import org.hibernate.persister.walking.spi.WalkingException;
 import org.hibernate.type.Type;
 
+import static org.hibernate.loader.spi.ResultSetProcessingContext.IdentifierResolutionContext;
+
 /**
  * @author Steve Ebersole
  */
-public abstract class AbstractLoadPlanBuilderStrategy implements LoadPlanBuilderStrategy {
+public abstract class AbstractLoadPlanBuilderStrategy implements LoadPlanBuilderStrategy, LoadPlanBuildingContext {
+	private static final Logger log = Logger.getLogger( AbstractLoadPlanBuilderStrategy.class );
+
 	private final SessionFactoryImplementor sessionFactory;
 
 	private ArrayDeque<FetchOwner> fetchOwnerStack = new ArrayDeque<FetchOwner>();
+	private ArrayDeque<CollectionReference> collectionReferenceStack = new ArrayDeque<CollectionReference>();
 
-	protected AbstractLoadPlanBuilderStrategy(SessionFactoryImplementor sessionFactory) {
+	protected AbstractLoadPlanBuilderStrategy(SessionFactoryImplementor sessionFactory, int suffixSeed) {
 		this.sessionFactory = sessionFactory;
+		this.currentSuffixBase = suffixSeed;
 	}
 
 	public SessionFactoryImplementor sessionFactory() {
@@ -53,21 +86,39 @@ public abstract class AbstractLoadPlanBuilderStrategy implements LoadPlanBuilder
 	}
 
 	protected FetchOwner currentFetchOwner() {
-		return fetchOwnerStack.peekLast();
+		return fetchOwnerStack.peekFirst();
 	}
 
 	@Override
 	public void start() {
-		// nothing to do
+		if ( ! fetchOwnerStack.isEmpty() ) {
+			throw new WalkingException(
+					"Fetch owner stack was not empty on start; " +
+							"be sure to not use LoadPlanBuilderStrategy instances concurrently"
+			);
+		}
+		if ( ! collectionReferenceStack.isEmpty() ) {
+			throw new WalkingException(
+					"Collection reference stack was not empty on start; " +
+							"be sure to not use LoadPlanBuilderStrategy instances concurrently"
+			);
+		}
 	}
 
 	@Override
 	public void finish() {
-		// nothing to do
+		fetchOwnerStack.clear();
+		collectionReferenceStack.clear();
 	}
 
 	@Override
 	public void startingEntity(EntityDefinition entityDefinition) {
+		log.tracef(
+				"%s Starting entity : %s",
+				StringHelper.repeat( ">>", fetchOwnerStack.size() ),
+				entityDefinition.getEntityPersister().getEntityName()
+		);
+
 		if ( fetchOwnerStack.isEmpty() ) {
 			// this is a root...
 			if ( ! supportsRootEntityReturns() ) {
@@ -75,7 +126,7 @@ public abstract class AbstractLoadPlanBuilderStrategy implements LoadPlanBuilder
 			}
 			final EntityReturn entityReturn = buildRootEntityReturn( entityDefinition );
 			addRootReturn( entityReturn );
-			fetchOwnerStack.push( entityReturn );
+			pushToStack( entityReturn );
 		}
 		// otherwise this call should represent a fetch which should have been handled in #startingAttribute
 	}
@@ -88,11 +139,112 @@ public abstract class AbstractLoadPlanBuilderStrategy implements LoadPlanBuilder
 
 	@Override
 	public void finishingEntity(EntityDefinition entityDefinition) {
-		// nothing to do
+		// pop the current fetch owner, and make sure what we just popped represents this entity
+		final FetchOwner poppedFetchOwner = popFromStack();
+
+		if ( ! EntityReference.class.isInstance( poppedFetchOwner ) ) {
+			throw new WalkingException( "Mismatched FetchOwner from stack on pop" );
+		}
+
+		final EntityReference entityReference = (EntityReference) poppedFetchOwner;
+		// NOTE : this is not the most exhaustive of checks because of hierarchical associations (employee/manager)
+		if ( ! entityReference.getEntityPersister().equals( entityDefinition.getEntityPersister() ) ) {
+			throw new WalkingException( "Mismatched FetchOwner from stack on pop" );
+		}
+
+		log.tracef(
+				"%s Finished entity : %s",
+				StringHelper.repeat( "<<", fetchOwnerStack.size() ),
+				entityDefinition.getEntityPersister().getEntityName()
+		);
+	}
+
+	@Override
+	public void startingEntityIdentifier(EntityIdentifierDefinition entityIdentifierDefinition) {
+		log.tracef(
+				"%s Starting entity identifier : %s",
+				StringHelper.repeat( ">>", fetchOwnerStack.size() ),
+				entityIdentifierDefinition.getEntityDefinition().getEntityPersister().getEntityName()
+		);
+
+		final EntityReference entityReference = (EntityReference) currentFetchOwner();
+
+		// perform some stack validation
+		if ( ! entityReference.getEntityPersister().equals( entityIdentifierDefinition.getEntityDefinition().getEntityPersister() ) ) {
+			throw new WalkingException(
+					String.format(
+							"Encountered unexpected fetch owner [%s] in stack while processing entity identifier for [%s]",
+							entityReference.getEntityPersister().getEntityName(),
+							entityIdentifierDefinition.getEntityDefinition().getEntityPersister().getEntityName()
+					)
+			);
+		}
+
+		final FetchOwner identifierAttributeCollector;
+		if ( entityIdentifierDefinition.isEncapsulated() ) {
+			identifierAttributeCollector = new EncapsulatedIdentifierAttributeCollector( entityReference );
+		}
+		else {
+			identifierAttributeCollector = new NonEncapsulatedIdentifierAttributeCollector( entityReference );
+		}
+		pushToStack( identifierAttributeCollector );
+	}
+
+	@Override
+	public void finishingEntityIdentifier(EntityIdentifierDefinition entityIdentifierDefinition) {
+		// perform some stack validation on exit, first on the current stack element we want to pop
+		{
+			final FetchOwner poppedFetchOwner = popFromStack();
+
+			if ( ! AbstractIdentifierAttributeCollector.class.isInstance( poppedFetchOwner ) ) {
+				throw new WalkingException( "Unexpected state in FetchOwner stack" );
+			}
+
+			final EntityReference entityReference = (EntityReference) poppedFetchOwner;
+			if ( ! entityReference.getEntityPersister().equals( entityIdentifierDefinition.getEntityDefinition().getEntityPersister() ) ) {
+				throw new WalkingException(
+						String.format(
+								"Encountered unexpected fetch owner [%s] in stack while processing entity identifier for [%s]",
+								entityReference.getEntityPersister().getEntityName(),
+								entityIdentifierDefinition.getEntityDefinition().getEntityPersister().getEntityName()
+						)
+				);
+			}
+		}
+
+		// and then on the element before it
+		{
+			final FetchOwner currentFetchOwner = currentFetchOwner();
+			if ( ! EntityReference.class.isInstance( currentFetchOwner ) ) {
+				throw new WalkingException( "Unexpected state in FetchOwner stack" );
+			}
+			final EntityReference entityReference = (EntityReference) currentFetchOwner;
+			if ( ! entityReference.getEntityPersister().equals( entityIdentifierDefinition.getEntityDefinition().getEntityPersister() ) ) {
+				throw new WalkingException(
+						String.format(
+								"Encountered unexpected fetch owner [%s] in stack while processing entity identifier for [%s]",
+								entityReference.getEntityPersister().getEntityName(),
+								entityIdentifierDefinition.getEntityDefinition().getEntityPersister().getEntityName()
+						)
+				);
+			}
+		}
+
+		log.tracef(
+				"%s Finished entity identifier : %s",
+				StringHelper.repeat( "<<", fetchOwnerStack.size() ),
+				entityIdentifierDefinition.getEntityDefinition().getEntityPersister().getEntityName()
+		);
 	}
 
 	@Override
 	public void startingCollection(CollectionDefinition collectionDefinition) {
+		log.tracef(
+				"%s Starting collection : %s",
+				StringHelper.repeat( ">>", fetchOwnerStack.size() ),
+				collectionDefinition.getCollectionPersister().getRole()
+		);
+
 		if ( fetchOwnerStack.isEmpty() ) {
 			// this is a root...
 			if ( ! supportsRootCollectionReturns() ) {
@@ -100,7 +252,7 @@ public abstract class AbstractLoadPlanBuilderStrategy implements LoadPlanBuilder
 			}
 			final CollectionReturn collectionReturn = buildRootCollectionReturn( collectionDefinition );
 			addRootReturn( collectionReturn );
-			fetchOwnerStack.push( collectionReturn );
+			pushToCollectionStack( collectionReturn );
 		}
 	}
 
@@ -109,24 +261,96 @@ public abstract class AbstractLoadPlanBuilderStrategy implements LoadPlanBuilder
 	}
 
 	@Override
-	public void finishingCollection(CollectionDefinition collectionDefinition) {
-		// nothing to do
+	public void startingCollectionIndex(CollectionIndexDefinition collectionIndexDefinition) {
+		final Type indexType = collectionIndexDefinition.getType();
+		if ( indexType.isAssociationType() || indexType.isComponentType() ) {
+			final CollectionReference collectionReference = collectionReferenceStack.peekFirst();
+			final FetchOwner indexGraph = collectionReference.getIndexGraph();
+			if ( indexGraph == null ) {
+				throw new WalkingException( "Collection reference did not return index handler" );
+			}
+			pushToStack( indexGraph );
+		}
 	}
 
 	@Override
-	public void startingComposite(CompositeDefinition compositeDefinition) {
+	public void finishingCollectionIndex(CollectionIndexDefinition collectionIndexDefinition) {
+		// nothing to do here
+		// 	- the element graph pushed while starting would be popped in finishing/Entity/finishingComposite
+	}
+
+	@Override
+	public void startingCollectionElements(CollectionElementDefinition elementDefinition) {
+		if ( elementDefinition.getType().isAssociationType() || elementDefinition.getType().isComponentType() ) {
+			final CollectionReference collectionReference = collectionReferenceStack.peekFirst();
+			final FetchOwner elementGraph = collectionReference.getElementGraph();
+			if ( elementGraph == null ) {
+				throw new WalkingException( "Collection reference did not return element handler" );
+			}
+			pushToStack( elementGraph );
+		}
+	}
+
+	@Override
+	public void finishingCollectionElements(CollectionElementDefinition elementDefinition) {
+		// nothing to do here
+		// 	- the element graph pushed while starting would be popped in finishing/Entity/finishingComposite
+	}
+
+	@Override
+	public void finishingCollection(CollectionDefinition collectionDefinition) {
+		// pop the current fetch owner, and make sure what we just popped represents this collection
+		final CollectionReference collectionReference = popFromCollectionStack();
+		if ( ! collectionReference.getCollectionPersister().equals( collectionDefinition.getCollectionPersister() ) ) {
+			throw new WalkingException( "Mismatched FetchOwner from stack on pop" );
+		}
+
+		log.tracef(
+				"%s Finished collection : %s",
+				StringHelper.repeat( "<<", fetchOwnerStack.size() ),
+				collectionDefinition.getCollectionPersister().getRole()
+		);
+	}
+
+	@Override
+	public void startingComposite(CompositionDefinition compositionDefinition) {
+		log.tracef(
+				"%s Starting composition : %s",
+				StringHelper.repeat( ">>", fetchOwnerStack.size() ),
+				compositionDefinition.getName()
+		);
+
 		if ( fetchOwnerStack.isEmpty() ) {
 			throw new HibernateException( "A component cannot be the root of a walk nor a graph" );
 		}
 	}
 
 	@Override
-	public void finishingComposite(CompositeDefinition compositeDefinition) {
-		// nothing to do
+	public void finishingComposite(CompositionDefinition compositionDefinition) {
+		// pop the current fetch owner, and make sure what we just popped represents this composition
+		final FetchOwner poppedFetchOwner = popFromStack();
+
+		if ( ! CompositeFetch.class.isInstance( poppedFetchOwner ) ) {
+			throw new WalkingException( "Mismatched FetchOwner from stack on pop" );
+		}
+
+		// NOTE : not much else we can really check here atm since on the walking spi side we do not have path
+
+		log.tracef(
+				"%s Finished composition : %s",
+				StringHelper.repeat( "<<", fetchOwnerStack.size() ),
+				compositionDefinition.getName()
+		);
 	}
 
 	@Override
 	public boolean startingAttribute(AttributeDefinition attributeDefinition) {
+		log.tracef(
+				"%s Starting attribute %s",
+				StringHelper.repeat( ">>", fetchOwnerStack.size() ),
+				attributeDefinition
+		);
+
 		final Type attributeType = attributeDefinition.getType();
 
 		final boolean isComponentType = attributeType.isComponentType();
@@ -136,30 +360,26 @@ public abstract class AbstractLoadPlanBuilderStrategy implements LoadPlanBuilder
 			return true;
 		}
 		else if ( isComponentType ) {
-			return handleCompositeAttribute( (CompositeDefinition) attributeDefinition );
+			return handleCompositeAttribute( (CompositionDefinition) attributeDefinition );
 		}
 		else {
 			return handleAssociationAttribute( (AssociationAttributeDefinition) attributeDefinition );
 		}
 	}
 
-
 	@Override
 	public void finishingAttribute(AttributeDefinition attributeDefinition) {
-		final Type attributeType = attributeDefinition.getType();
-
-		final boolean isComponentType = attributeType.isComponentType();
-		final boolean isBasicType = ! ( isComponentType || attributeType.isAssociationType() );
-
-		if ( ! isBasicType ) {
-			fetchOwnerStack.removeLast();
-		}
+		log.tracef(
+				"%s Finishing up attribute : %s",
+				StringHelper.repeat( "<<", fetchOwnerStack.size() ),
+				attributeDefinition
+		);
 	}
 
-	protected boolean handleCompositeAttribute(CompositeDefinition attributeDefinition) {
-		final FetchOwner fetchOwner = fetchOwnerStack.peekLast();
-		final CompositeFetch fetch = buildCompositeFetch( fetchOwner, attributeDefinition );
-		fetchOwnerStack.addLast( fetch );
+	protected boolean handleCompositeAttribute(CompositionDefinition attributeDefinition) {
+		final FetchOwner fetchOwner = currentFetchOwner();
+		final CompositeFetch fetch = fetchOwner.buildCompositeFetch( attributeDefinition, this );
+		pushToStack( fetch );
 		return true;
 	}
 
@@ -169,17 +389,20 @@ public abstract class AbstractLoadPlanBuilderStrategy implements LoadPlanBuilder
 			return false;
 		}
 
-		final FetchOwner fetchOwner = fetchOwnerStack.peekLast();
+		final FetchOwner fetchOwner = currentFetchOwner();
 		fetchOwner.validateFetchPlan( fetchStrategy );
 
 		final Fetch associationFetch;
 		if ( attributeDefinition.isCollection() ) {
-			associationFetch = buildCollectionFetch( fetchOwner, attributeDefinition, fetchStrategy );
+			associationFetch = fetchOwner.buildCollectionFetch( attributeDefinition, fetchStrategy, this );
 		}
 		else {
-			associationFetch = buildEntityFetch( fetchOwner, attributeDefinition, fetchStrategy );
+			associationFetch = fetchOwner.buildEntityFetch( attributeDefinition, fetchStrategy, this );
+		}
+
+		if ( FetchOwner.class.isInstance( associationFetch ) ) {
+			pushToStack( (FetchOwner) associationFetch );
 		}
-		fetchOwnerStack.addLast( associationFetch );
 
 		return true;
 	}
@@ -194,19 +417,309 @@ public abstract class AbstractLoadPlanBuilderStrategy implements LoadPlanBuilder
 		return false;
 	}
 
+	private void pushToStack(FetchOwner fetchOwner) {
+		log.trace( "Pushing fetch owner to stack : " + fetchOwner );
+		fetchOwnerStack.addFirst( fetchOwner );
+	}
+
+	private FetchOwner popFromStack() {
+		final FetchOwner last = fetchOwnerStack.removeFirst();
+		log.trace( "Popped fetch owner from stack : " + last );
+		if ( FetchStackAware.class.isInstance( last ) ) {
+			( (FetchStackAware) last ).poppedFromStack();
+		}
+		return last;
+	}
+
+	private void pushToCollectionStack(CollectionReference collectionReference) {
+		log.trace( "Pushing collection reference to stack : " + collectionReference );
+		collectionReferenceStack.addFirst( collectionReference );
+	}
+
+	private CollectionReference popFromCollectionStack() {
+		final CollectionReference last = collectionReferenceStack.removeFirst();
+		log.trace( "Popped collection reference from stack : " + last );
+		if ( FetchStackAware.class.isInstance( last ) ) {
+			( (FetchStackAware) last ).poppedFromStack();
+		}
+		return last;
+	}
+
 	protected abstract EntityReturn buildRootEntityReturn(EntityDefinition entityDefinition);
 
 	protected abstract CollectionReturn buildRootCollectionReturn(CollectionDefinition collectionDefinition);
 
-	protected abstract CollectionFetch buildCollectionFetch(
-			FetchOwner fetchOwner,
-			AssociationAttributeDefinition attributeDefinition,
-			FetchStrategy fetchStrategy);
 
-	protected abstract EntityFetch buildEntityFetch(
-			FetchOwner fetchOwner,
-			AssociationAttributeDefinition attributeDefinition,
-			FetchStrategy fetchStrategy);
 
-	protected abstract CompositeFetch buildCompositeFetch(FetchOwner fetchOwner, CompositeDefinition attributeDefinition);
+	// LoadPlanBuildingContext impl ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+	private int currentSuffixBase;
+	private int implicitAliasUniqueness = 0;
+
+	private String createImplicitAlias() {
+		return "ia" + implicitAliasUniqueness++;
+	}
+
+	@Override
+	public SessionFactoryImplementor getSessionFactory() {
+		return sessionFactory();
+	}
+
+	@Override
+	public EntityAliases resolveEntityColumnAliases(AssociationAttributeDefinition attributeDefinition) {
+		return generateEntityColumnAliases( attributeDefinition.toEntityDefinition().getEntityPersister() );
+	}
+
+	protected EntityAliases generateEntityColumnAliases(EntityPersister persister) {
+		return new DefaultEntityAliases( (Loadable) persister, Integer.toString( currentSuffixBase++ ) + '_' );
+	}
+
+	@Override
+	public CollectionAliases resolveCollectionColumnAliases(AssociationAttributeDefinition attributeDefinition) {
+		return generateCollectionColumnAliases( attributeDefinition.toCollectionDefinition().getCollectionPersister() );
+	}
+
+	protected CollectionAliases generateCollectionColumnAliases(CollectionPersister persister) {
+		return new GeneratedCollectionAliases( persister, Integer.toString( currentSuffixBase++ ) + '_' );
+	}
+
+	@Override
+	public String resolveRootSourceAlias(EntityDefinition definition) {
+		return createImplicitAlias();
+	}
+
+	@Override
+	public String resolveRootSourceAlias(CollectionDefinition definition) {
+		return createImplicitAlias();
+	}
+
+	@Override
+	public String resolveFetchSourceAlias(AssociationAttributeDefinition attributeDefinition) {
+		return createImplicitAlias();
+	}
+
+	@Override
+	public String resolveFetchSourceAlias(CompositionDefinition compositionDefinition) {
+		return createImplicitAlias();
+	}
+
+	public static interface FetchStackAware {
+		public void poppedFromStack();
+	}
+
+	protected static abstract class AbstractIdentifierAttributeCollector
+			implements FetchOwner, EntityReference, FetchStackAware {
+
+		protected final EntityReference entityReference;
+		private final PropertyPath propertyPath;
+
+		protected final List<EntityFetch> identifierFetches = new ArrayList<EntityFetch>();
+		protected final Map<EntityFetch,HydratedCompoundValueHandler> fetchToHydratedStateExtractorMap
+				= new HashMap<EntityFetch, HydratedCompoundValueHandler>();
+
+		public AbstractIdentifierAttributeCollector(EntityReference entityReference) {
+			this.entityReference = entityReference;
+			this.propertyPath = ( (FetchOwner) entityReference ).getPropertyPath().append( "<id>" );
+		}
+
+		@Override
+		public String getAlias() {
+			return entityReference.getAlias();
+		}
+
+		@Override
+		public LockMode getLockMode() {
+			return entityReference.getLockMode();
+		}
+
+		@Override
+		public EntityPersister getEntityPersister() {
+			return entityReference.getEntityPersister();
+		}
+
+		@Override
+		public IdentifierDescription getIdentifierDescription() {
+			return entityReference.getIdentifierDescription();
+		}
+
+		@Override
+		public CollectionFetch buildCollectionFetch(
+				AssociationAttributeDefinition attributeDefinition,
+				FetchStrategy fetchStrategy,
+				LoadPlanBuildingContext loadPlanBuildingContext) {
+			throw new WalkingException( "Entity identifier cannot contain persistent collections" );
+		}
+
+		@Override
+		public EntityFetch buildEntityFetch(
+				AssociationAttributeDefinition attributeDefinition,
+				FetchStrategy fetchStrategy,
+				LoadPlanBuildingContext loadPlanBuildingContext) {
+			// we have a key-many-to-one
+			//
+			// IMPL NOTE: we pass ourselves as the FetchOwner which will route the fetch back throw our #addFetch
+			// 		impl.  We collect them there and later build the IdentifierDescription
+			final EntityFetch fetch = LoadPlanBuildingHelper.buildStandardEntityFetch(
+					this,
+					attributeDefinition,
+					fetchStrategy,
+					loadPlanBuildingContext
+			);
+			fetchToHydratedStateExtractorMap.put( fetch, attributeDefinition.getHydratedCompoundValueExtractor() );
+
+			return fetch;
+		}
+
+		@Override
+		public CompositeFetch buildCompositeFetch(
+				CompositionDefinition attributeDefinition, LoadPlanBuildingContext loadPlanBuildingContext) {
+			// nested composition.  Unusual, but not disallowed.
+			//
+			// IMPL NOTE: we pass ourselves as the FetchOwner which will route the fetch back throw our #addFetch
+			// 		impl.  We collect them there and later build the IdentifierDescription
+			return LoadPlanBuildingHelper.buildStandardCompositeFetch(
+					this,
+					attributeDefinition,
+					loadPlanBuildingContext
+			);
+		}
+
+		@Override
+		public void poppedFromStack() {
+			final IdentifierDescription identifierDescription = buildIdentifierDescription();
+			entityReference.injectIdentifierDescription( identifierDescription );
+		}
+
+		protected abstract IdentifierDescription buildIdentifierDescription();
+
+		@Override
+		public void addFetch(Fetch fetch) {
+			identifierFetches.add( (EntityFetch) fetch );
+		}
+
+		@Override
+		public Fetch[] getFetches() {
+			return ( (FetchOwner) entityReference ).getFetches();
+		}
+
+		@Override
+		public void validateFetchPlan(FetchStrategy fetchStrategy) {
+			( (FetchOwner) entityReference ).validateFetchPlan( fetchStrategy );
+		}
+
+		@Override
+		public EntityPersister retrieveFetchSourcePersister() {
+			return ( (FetchOwner) entityReference ).retrieveFetchSourcePersister();
+		}
+
+		@Override
+		public PropertyPath getPropertyPath() {
+			return propertyPath;
+		}
+
+		@Override
+		public void injectIdentifierDescription(IdentifierDescription identifierDescription) {
+			throw new WalkingException(
+					"IdentifierDescription collector should not get injected with IdentifierDescription"
+			);
+		}
+	}
+
+	protected static class EncapsulatedIdentifierAttributeCollector extends AbstractIdentifierAttributeCollector {
+		public EncapsulatedIdentifierAttributeCollector(EntityReference entityReference) {
+			super( entityReference );
+		}
+
+		@Override
+		protected IdentifierDescription buildIdentifierDescription() {
+			return new IdentifierDescriptionImpl(
+					entityReference,
+					identifierFetches.toArray( new EntityFetch[ identifierFetches.size() ] ),
+					null
+			);
+		}
+	}
+
+	protected static class NonEncapsulatedIdentifierAttributeCollector extends AbstractIdentifierAttributeCollector {
+		public NonEncapsulatedIdentifierAttributeCollector(EntityReference entityReference) {
+			super( entityReference );
+		}
+
+		@Override
+		protected IdentifierDescription buildIdentifierDescription() {
+			return new IdentifierDescriptionImpl(
+					entityReference,
+					identifierFetches.toArray( new EntityFetch[ identifierFetches.size() ] ),
+					fetchToHydratedStateExtractorMap
+			);
+		}
+	}
+
+	private static class IdentifierDescriptionImpl implements IdentifierDescription {
+		private final EntityReference entityReference;
+		private final EntityFetch[] identifierFetches;
+		private final Map<EntityFetch,HydratedCompoundValueHandler> fetchToHydratedStateExtractorMap;
+
+		private IdentifierDescriptionImpl(
+				EntityReference entityReference, EntityFetch[] identifierFetches,
+				Map<EntityFetch, HydratedCompoundValueHandler> fetchToHydratedStateExtractorMap) {
+			this.entityReference = entityReference;
+			this.identifierFetches = identifierFetches;
+			this.fetchToHydratedStateExtractorMap = fetchToHydratedStateExtractorMap;
+		}
+
+		@Override
+		public Fetch[] getFetches() {
+			return identifierFetches;
+		}
+
+		@Override
+		public void hydrate(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException {
+			final IdentifierResolutionContext ownerIdentifierResolutionContext =
+					context.getIdentifierResolutionContext( entityReference );
+			final Serializable ownerIdentifierHydratedState = ownerIdentifierResolutionContext.getHydratedForm();
+
+			for ( EntityFetch fetch : identifierFetches ) {
+				final IdentifierResolutionContext identifierResolutionContext =
+						context.getIdentifierResolutionContext( fetch );
+				// if the identifier was already hydrated, nothing to do
+				if ( identifierResolutionContext.getHydratedForm() != null ) {
+					continue;
+				}
+
+				// try to extract the sub-hydrated value from the owners tuple array
+				if ( fetchToHydratedStateExtractorMap != null && ownerIdentifierHydratedState != null ) {
+					Serializable extracted = (Serializable) fetchToHydratedStateExtractorMap.get( fetch )
+							.extract( ownerIdentifierHydratedState );
+					identifierResolutionContext.registerHydratedForm( extracted );
+					continue;
+				}
+
+				// if we can't, then read from result set
+				fetch.hydrate( resultSet, context );
+			}
+		}
+
+		@Override
+		public EntityKey resolve(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException {
+			for ( EntityFetch fetch : identifierFetches ) {
+				final IdentifierResolutionContext identifierResolutionContext =
+						context.getIdentifierResolutionContext( fetch );
+				if ( identifierResolutionContext.getEntityKey() != null ) {
+					continue;
+				}
+
+				EntityKey fetchKey = fetch.resolveInIdentifier( resultSet, context );
+				identifierResolutionContext.registerEntityKey( fetchKey );
+			}
+
+			final IdentifierResolutionContext ownerIdentifierResolutionContext =
+					context.getIdentifierResolutionContext( entityReference );
+			Serializable hydratedState = ownerIdentifierResolutionContext.getHydratedForm();
+			Serializable resolvedId = (Serializable) entityReference.getEntityPersister()
+					.getIdentifierType()
+					.resolve( hydratedState, context.getSession(), null );
+			return context.getSession().generateEntityKey( resolvedId, entityReference.getEntityPersister() );
+		}
+	}
 }

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/CollectionFetch.java

@@ -23,58 +23,75 @@
  */
 package org.hibernate.loader.plan.spi;
 
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
 import org.hibernate.LockMode;
 import org.hibernate.engine.FetchStrategy;
 import org.hibernate.engine.spi.SessionFactoryImplementor;
 import org.hibernate.loader.CollectionAliases;
 import org.hibernate.loader.EntityAliases;
-import org.hibernate.persister.collection.CollectionPersister;
-import org.hibernate.persister.collection.QueryableCollection;
-import org.hibernate.persister.entity.EntityPersister;
+import org.hibernate.loader.PropertyPath;
+import org.hibernate.loader.spi.ResultSetProcessingContext;
 
 /**
  * @author Steve Ebersole
  */
-public class CollectionFetch extends AbstractFetch implements CollectionReference {
-	private final CollectionAliases collectionAliases;
-	private final EntityAliases elementEntityAliases;
-
-	private final CollectionPersister persister;
+public class CollectionFetch extends AbstractCollectionReference implements CollectionReference, Fetch {
+	private final FetchOwner fetchOwner;
+	private final FetchStrategy fetchStrategy;
 
 	public CollectionFetch(
 			SessionFactoryImplementor sessionFactory,
 			String alias,
 			LockMode lockMode,
-			AbstractFetchOwner owner,
+			FetchOwner fetchOwner,
 			FetchStrategy fetchStrategy,
 			String ownerProperty,
 			CollectionAliases collectionAliases,
 			EntityAliases elementEntityAliases) {
-		super( sessionFactory, alias, lockMode, owner, ownerProperty, fetchStrategy );
-		this.collectionAliases = collectionAliases;
-		this.elementEntityAliases = elementEntityAliases;
-
-		final String role = owner.retrieveFetchSourcePersister().getEntityName() + '.' + getOwnerPropertyName();
-		this.persister = sessionFactory.getCollectionPersister( role );
+		super(
+				sessionFactory,
+				alias,
+				lockMode,
+				sessionFactory.getCollectionPersister(
+						fetchOwner.retrieveFetchSourcePersister().getEntityName() + '.' + ownerProperty
+				),
+				fetchOwner.getPropertyPath().append( ownerProperty ),
+				collectionAliases,
+				elementEntityAliases
+		);
+		this.fetchOwner = fetchOwner;
+		this.fetchStrategy = fetchStrategy;
 	}
 
 	@Override
-	public CollectionAliases getCollectionAliases() {
-		return collectionAliases;
+	public FetchOwner getOwner() {
+		return fetchOwner;
 	}
 
 	@Override
-	public EntityAliases getElementEntityAliases() {
-		return elementEntityAliases;
+	public String getOwnerPropertyName() {
+		return getPropertyPath().getProperty();
 	}
 
 	@Override
-	public CollectionPersister getCollectionPersister() {
-		return persister;
+	public FetchStrategy getFetchStrategy() {
+		return fetchStrategy;
 	}
 
 	@Override
-	public EntityPersister retrieveFetchSourcePersister() {
-		return ( (QueryableCollection) getCollectionPersister() ).getElementPersister();
+	public PropertyPath getPropertyPath() {
+		return propertyPath();
+	}
+
+	@Override
+	public void hydrate(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException {
+		//To change body of implemented methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public Object resolve(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException {
+		return null;  //To change body of implemented methods use File | Settings | File Templates.
 	}
 }

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/CollectionReference.java

@@ -55,6 +55,12 @@ public interface CollectionReference {
 	 */
 	public CollectionPersister getCollectionPersister();
 
+	public FetchOwner getIndexGraph();
+
+	public FetchOwner getElementGraph();
+
+	public boolean hasEntityElements();
+
 	/**
 	 * Returns the description of the aliases in the JDBC ResultSet that identify values "belonging" to the
 	 * this collection.

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/CollectionReferenceImplementor.java

@@ -0,0 +1,30 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.loader.plan.spi;
+
+/**
+ * @author Steve Ebersole
+ */
+public interface CollectionReferenceImplementor {
+}

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/CollectionReturn.java

@@ -23,28 +23,22 @@
  */
 package org.hibernate.loader.plan.spi;
 
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
 import org.hibernate.LockMode;
-import org.hibernate.engine.FetchStrategy;
 import org.hibernate.engine.spi.SessionFactoryImplementor;
 import org.hibernate.loader.CollectionAliases;
 import org.hibernate.loader.EntityAliases;
 import org.hibernate.loader.PropertyPath;
-import org.hibernate.persister.collection.CollectionPersister;
-import org.hibernate.persister.collection.QueryableCollection;
-import org.hibernate.persister.entity.EntityPersister;
+import org.hibernate.loader.spi.ResultSetProcessingContext;
 
 /**
  * @author Steve Ebersole
  */
-public class CollectionReturn extends AbstractFetchOwner implements Return, FetchOwner, CollectionReference {
+public class CollectionReturn extends AbstractCollectionReference implements Return, CollectionReference {
 	private final String ownerEntityName;
 	private final String ownerProperty;
-	private final CollectionAliases collectionAliases;
-	private final EntityAliases elementEntityAliases;
-
-	private final CollectionPersister persister;
-
-	private final PropertyPath propertyPath = new PropertyPath(); // its a root
 
 	public CollectionReturn(
 			SessionFactoryImplementor sessionFactory,
@@ -54,14 +48,17 @@ public class CollectionReturn extends AbstractFetchOwner implements Return, Fetc
 			String ownerProperty,
 			CollectionAliases collectionAliases,
 			EntityAliases elementEntityAliases) {
-		super( sessionFactory, alias, lockMode );
+		super(
+				sessionFactory,
+				alias,
+				lockMode,
+				sessionFactory.getCollectionPersister( ownerEntityName + '.' + ownerProperty ),
+				new PropertyPath(), // its a root
+				collectionAliases,
+				elementEntityAliases
+		);
 		this.ownerEntityName = ownerEntityName;
 		this.ownerProperty = ownerProperty;
-		this.collectionAliases = collectionAliases;
-		this.elementEntityAliases = elementEntityAliases;
-
-		final String role = ownerEntityName + '.' + ownerProperty;
-		this.persister = sessionFactory.getCollectionPersister( role );
 	}
 
 	/**
@@ -83,31 +80,22 @@ public class CollectionReturn extends AbstractFetchOwner implements Return, Fetc
 	}
 
 	@Override
-	public CollectionAliases getCollectionAliases() {
-		return collectionAliases;
+	public void hydrate(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException {
+		// todo : anything to do here?
 	}
 
 	@Override
-	public EntityAliases getElementEntityAliases() {
-		return elementEntityAliases;
+	public void resolve(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException {
+		// todo : anything to do here?
 	}
 
 	@Override
-	public CollectionPersister getCollectionPersister() {
-		return persister;
+	public Object read(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException {
+		return null;  //To change body of implemented methods use File | Settings | File Templates.
 	}
 
 	@Override
-	public void validateFetchPlan(FetchStrategy fetchStrategy) {
-	}
-
-	@Override
-	public EntityPersister retrieveFetchSourcePersister() {
-		return ( (QueryableCollection) persister ).getElementPersister();
-	}
-
-	@Override
-	public PropertyPath getPropertyPath() {
-		return propertyPath;
+	public String toString() {
+		return "CollectionReturn(" + getCollectionPersister().getRole() + ")";
 	}
 }

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/CompositeElementGraph.java

@@ -0,0 +1,90 @@
+package org.hibernate.loader.plan.spi;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.hibernate.HibernateException;
+import org.hibernate.engine.FetchStrategy;
+import org.hibernate.engine.spi.SessionFactoryImplementor;
+import org.hibernate.loader.PropertyPath;
+import org.hibernate.loader.plan.internal.LoadPlanBuildingHelper;
+import org.hibernate.persister.collection.CollectionPersister;
+import org.hibernate.persister.entity.EntityPersister;
+import org.hibernate.persister.walking.spi.AssociationAttributeDefinition;
+import org.hibernate.persister.walking.spi.CompositionDefinition;
+
+/**
+ * @author Steve Ebersole
+ */
+public class CompositeElementGraph extends AbstractPlanNode implements FetchOwner {
+	private final CollectionReference collectionReference;
+	private final PropertyPath propertyPath;
+	private final CollectionPersister collectionPersister;
+
+	private List<Fetch> fetches;
+	public CompositeElementGraph(
+			SessionFactoryImplementor sessionFactory,
+			CollectionReference collectionReference,
+			PropertyPath collectionPath) {
+		super( sessionFactory );
+
+		this.collectionReference = collectionReference;
+		this.collectionPersister = collectionReference.getCollectionPersister();
+		this.propertyPath = collectionPath.append( "<elements>" );
+	}
+
+	@Override
+	public void addFetch(Fetch fetch) {
+		if ( fetches == null ) {
+			fetches = new ArrayList<Fetch>();
+		}
+		fetches.add( fetch );
+	}
+
+	@Override
+	public Fetch[] getFetches() {
+		return fetches == null ? NO_FETCHES : fetches.toArray( new Fetch[ fetches.size() ] );
+	}
+
+	@Override
+	public void validateFetchPlan(FetchStrategy fetchStrategy) {
+	}
+
+	@Override
+	public EntityPersister retrieveFetchSourcePersister() {
+		return collectionPersister.getOwnerEntityPersister();
+	}
+
+	@Override
+	public PropertyPath getPropertyPath() {
+		return propertyPath;
+	}
+
+	@Override
+	public CollectionFetch buildCollectionFetch(
+			AssociationAttributeDefinition attributeDefinition,
+			FetchStrategy fetchStrategy,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		throw new HibernateException( "Collection composite element cannot define collections" );
+	}
+
+	@Override
+	public EntityFetch buildEntityFetch(
+			AssociationAttributeDefinition attributeDefinition,
+			FetchStrategy fetchStrategy,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		return LoadPlanBuildingHelper.buildStandardEntityFetch(
+				this,
+				attributeDefinition,
+				fetchStrategy,
+				loadPlanBuildingContext
+		);
+	}
+
+	@Override
+	public CompositeFetch buildCompositeFetch(
+			CompositionDefinition attributeDefinition,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		return LoadPlanBuildingHelper.buildStandardCompositeFetch( this, attributeDefinition, loadPlanBuildingContext );
+	}
+}

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/CompositeFetch.java

@@ -23,12 +23,18 @@
  */
 package org.hibernate.loader.plan.spi;
 
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
 import org.hibernate.LockMode;
 import org.hibernate.engine.FetchStrategy;
 import org.hibernate.engine.FetchStyle;
 import org.hibernate.engine.FetchTiming;
 import org.hibernate.engine.spi.SessionFactoryImplementor;
+import org.hibernate.loader.spi.ResultSetProcessingContext;
 import org.hibernate.persister.entity.EntityPersister;
+import org.hibernate.persister.walking.spi.AssociationAttributeDefinition;
+import org.hibernate.persister.walking.spi.CompositionDefinition;
 
 /**
  * @author Steve Ebersole
@@ -48,4 +54,36 @@ public class CompositeFetch extends AbstractFetch implements Fetch {
 	public EntityPersister retrieveFetchSourcePersister() {
 		return getOwner().retrieveFetchSourcePersister();
 	}
+
+	@Override
+	public CollectionFetch buildCollectionFetch(
+			AssociationAttributeDefinition attributeDefinition,
+			FetchStrategy fetchStrategy,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		return null;  //To change body of implemented methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public EntityFetch buildEntityFetch(
+			AssociationAttributeDefinition attributeDefinition,
+			FetchStrategy fetchStrategy,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		return null;  //To change body of implemented methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public CompositeFetch buildCompositeFetch(
+			CompositionDefinition attributeDefinition, LoadPlanBuildingContext loadPlanBuildingContext) {
+		return null;  //To change body of implemented methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public void hydrate(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException {
+		//To change body of implemented methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public Object resolve(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException {
+		return null;  //To change body of implemented methods use File | Settings | File Templates.
+	}
 }

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/CompositeIndexGraph.java

@@ -0,0 +1,90 @@
+package org.hibernate.loader.plan.spi;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.hibernate.HibernateException;
+import org.hibernate.engine.FetchStrategy;
+import org.hibernate.engine.spi.SessionFactoryImplementor;
+import org.hibernate.loader.PropertyPath;
+import org.hibernate.loader.plan.internal.LoadPlanBuildingHelper;
+import org.hibernate.persister.collection.CollectionPersister;
+import org.hibernate.persister.entity.EntityPersister;
+import org.hibernate.persister.walking.spi.AssociationAttributeDefinition;
+import org.hibernate.persister.walking.spi.CompositionDefinition;
+
+/**
+ * @author Steve Ebersole
+ */
+public class CompositeIndexGraph extends AbstractPlanNode implements FetchOwner {
+	private final CollectionReference collectionReference;
+	private final PropertyPath propertyPath;
+	private final CollectionPersister collectionPersister;
+
+	private List<Fetch> fetches;
+
+	public CompositeIndexGraph(
+			SessionFactoryImplementor sessionFactory,
+			CollectionReference collectionReference,
+			PropertyPath propertyPath) {
+		super( sessionFactory );
+		this.collectionReference = collectionReference;
+		this.collectionPersister = collectionReference.getCollectionPersister();
+		this.propertyPath = propertyPath.append( "<index>" );
+	}
+
+	@Override
+	public void addFetch(Fetch fetch) {
+		if ( fetches == null ) {
+			fetches = new ArrayList<Fetch>();
+		}
+		fetches.add( fetch );
+	}
+
+	@Override
+	public Fetch[] getFetches() {
+		return fetches == null ? NO_FETCHES : fetches.toArray( new Fetch[ fetches.size() ] );
+	}
+
+	@Override
+	public void validateFetchPlan(FetchStrategy fetchStrategy) {
+	}
+
+	@Override
+	public EntityPersister retrieveFetchSourcePersister() {
+		return collectionPersister.getOwnerEntityPersister();
+	}
+
+	@Override
+	public PropertyPath getPropertyPath() {
+		return propertyPath;
+	}
+
+	@Override
+	public CollectionFetch buildCollectionFetch(
+			AssociationAttributeDefinition attributeDefinition,
+			FetchStrategy fetchStrategy,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		throw new HibernateException( "Composite index cannot define collections" );
+	}
+
+	@Override
+	public EntityFetch buildEntityFetch(
+			AssociationAttributeDefinition attributeDefinition,
+			FetchStrategy fetchStrategy,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		return LoadPlanBuildingHelper.buildStandardEntityFetch(
+				this,
+				attributeDefinition,
+				fetchStrategy,
+				loadPlanBuildingContext
+		);
+	}
+
+	@Override
+	public CompositeFetch buildCompositeFetch(
+			CompositionDefinition attributeDefinition,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		return LoadPlanBuildingHelper.buildStandardCompositeFetch( this, attributeDefinition, loadPlanBuildingContext );
+	}
+}

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/EntityElementGraph.java

@@ -0,0 +1,133 @@
+package org.hibernate.loader.plan.spi;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.hibernate.LockMode;
+import org.hibernate.engine.FetchStrategy;
+import org.hibernate.engine.spi.SessionFactoryImplementor;
+import org.hibernate.loader.PropertyPath;
+import org.hibernate.loader.plan.internal.LoadPlanBuildingHelper;
+import org.hibernate.persister.collection.CollectionPersister;
+import org.hibernate.persister.entity.EntityPersister;
+import org.hibernate.persister.walking.spi.AssociationAttributeDefinition;
+import org.hibernate.persister.walking.spi.CompositionDefinition;
+import org.hibernate.type.AssociationType;
+
+/**
+ * @author Steve Ebersole
+ */
+public class EntityElementGraph extends AbstractPlanNode implements FetchOwner, EntityReference {
+	private final CollectionReference collectionReference;
+	private final CollectionPersister collectionPersister;
+	private final AssociationType elementType;
+	private final EntityPersister elementPersister;
+	private final PropertyPath propertyPath;
+
+	private List<Fetch> fetches;
+
+	private IdentifierDescription identifierDescription;
+
+	public EntityElementGraph(
+			SessionFactoryImplementor sessionFactory,
+			CollectionReference collectionReference,
+			PropertyPath collectionPath) {
+		super( sessionFactory );
+
+		this.collectionReference = collectionReference;
+		this.collectionPersister = collectionReference.getCollectionPersister();
+		this.elementType = (AssociationType) collectionPersister.getElementType();
+		this.elementPersister = (EntityPersister) this.elementType.getAssociatedJoinable( sessionFactory() );
+		this.propertyPath = collectionPath.append( "<elements>" );
+	}
+
+	@Override
+	public String getAlias() {
+		return null;
+	}
+
+	@Override
+	public LockMode getLockMode() {
+		return null;
+	}
+
+	@Override
+	public EntityPersister getEntityPersister() {
+		return elementPersister;
+	}
+
+	@Override
+	public IdentifierDescription getIdentifierDescription() {
+		return identifierDescription;
+	}
+
+	@Override
+	public void addFetch(Fetch fetch) {
+		if ( fetches == null ) {
+			fetches = new ArrayList<Fetch>();
+		}
+		fetches.add( fetch );
+	}
+
+	@Override
+	public Fetch[] getFetches() {
+		return fetches == null ? NO_FETCHES : fetches.toArray( new Fetch[ fetches.size() ] );
+	}
+
+	@Override
+	public void validateFetchPlan(FetchStrategy fetchStrategy) {
+	}
+
+	@Override
+	public EntityPersister retrieveFetchSourcePersister() {
+		return elementPersister;
+	}
+
+	@Override
+	public PropertyPath getPropertyPath() {
+		return propertyPath;
+	}
+
+	@Override
+	public CollectionFetch buildCollectionFetch(
+			AssociationAttributeDefinition attributeDefinition,
+			FetchStrategy fetchStrategy,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		return LoadPlanBuildingHelper.buildStandardCollectionFetch(
+				this,
+				attributeDefinition,
+				fetchStrategy,
+				loadPlanBuildingContext
+		);
+	}
+
+	@Override
+	public EntityFetch buildEntityFetch(
+			AssociationAttributeDefinition attributeDefinition,
+			FetchStrategy fetchStrategy,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		return LoadPlanBuildingHelper.buildStandardEntityFetch(
+				this,
+				attributeDefinition,
+				fetchStrategy,
+				loadPlanBuildingContext
+		);
+	}
+
+	@Override
+	public CompositeFetch buildCompositeFetch(
+			CompositionDefinition attributeDefinition,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		return LoadPlanBuildingHelper.buildStandardCompositeFetch( this, attributeDefinition, loadPlanBuildingContext );
+	}
+
+	@Override
+	public void injectIdentifierDescription(IdentifierDescription identifierDescription) {
+		this.identifierDescription = identifierDescription;
+	}
+
+	@Override
+	public String toString() {
+		return "EntityElementGraph(collection=" + collectionPersister.getRole() + ", type=" + elementPersister.getEntityName() + ")";
+	}
+}

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/EntityFetch.java

@@ -23,27 +23,40 @@
  */
 package org.hibernate.loader.plan.spi;
 
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
 import org.hibernate.LockMode;
+import org.hibernate.WrongClassException;
 import org.hibernate.engine.FetchStrategy;
+import org.hibernate.engine.FetchTiming;
+import org.hibernate.engine.spi.EntityKey;
 import org.hibernate.engine.spi.SessionFactoryImplementor;
 import org.hibernate.loader.EntityAliases;
+import org.hibernate.loader.plan.internal.LoadPlanBuildingHelper;
+import org.hibernate.loader.spi.ResultSetProcessingContext;
 import org.hibernate.persister.entity.EntityPersister;
+import org.hibernate.persister.walking.spi.AssociationAttributeDefinition;
+import org.hibernate.persister.walking.spi.CompositionDefinition;
 import org.hibernate.type.EntityType;
 
 /**
  * @author Steve Ebersole
  */
-public class EntityFetch extends AbstractFetch implements EntityReference {
+public class EntityFetch extends AbstractFetch implements EntityReference, FetchOwner {
 	private final String sqlTableAlias;
 	private final EntityAliases entityAliases;
 
+	private final EntityType associationType;
 	private final EntityPersister persister;
 
+	private IdentifierDescription identifierDescription;
+
 	public EntityFetch(
 			SessionFactoryImplementor sessionFactory,
 			String alias,
 			LockMode lockMode,
-			AbstractFetchOwner owner,
+			FetchOwner owner,
 			String ownerProperty,
 			FetchStrategy fetchStrategy,
 			String sqlTableAlias,
@@ -52,8 +65,8 @@ public class EntityFetch extends AbstractFetch implements EntityReference {
 		this.sqlTableAlias = sqlTableAlias;
 		this.entityAliases = entityAliases;
 
-		final EntityType type = (EntityType) owner.retrieveFetchSourcePersister().getPropertyType( ownerProperty );
-		this.persister = sessionFactory.getEntityPersister( type.getAssociatedEntityName() );
+		this.associationType = (EntityType) owner.retrieveFetchSourcePersister().getPropertyType( ownerProperty );
+		this.persister = sessionFactory.getEntityPersister( associationType.getAssociatedEntityName() );
 	}
 
 	@Override
@@ -62,17 +75,174 @@ public class EntityFetch extends AbstractFetch implements EntityReference {
 	}
 
 	@Override
-	public EntityAliases getEntityAliases() {
-		return entityAliases;
-	}
-
-	@Override
-	public String getSqlTableAlias() {
-		return sqlTableAlias;
+	public IdentifierDescription getIdentifierDescription() {
+		return identifierDescription;
 	}
 
 	@Override
 	public EntityPersister retrieveFetchSourcePersister() {
 		return persister;
 	}
+
+
+	@Override
+	public CollectionFetch buildCollectionFetch(
+			AssociationAttributeDefinition attributeDefinition,
+			FetchStrategy fetchStrategy,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		return LoadPlanBuildingHelper.buildStandardCollectionFetch(
+				this,
+				attributeDefinition,
+				fetchStrategy,
+				loadPlanBuildingContext
+		);
+	}
+
+	@Override
+	public EntityFetch buildEntityFetch(
+			AssociationAttributeDefinition attributeDefinition,
+			FetchStrategy fetchStrategy,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		return LoadPlanBuildingHelper.buildStandardEntityFetch(
+				this,
+				attributeDefinition,
+				fetchStrategy,
+				loadPlanBuildingContext
+		);
+	}
+
+	@Override
+	public CompositeFetch buildCompositeFetch(
+			CompositionDefinition attributeDefinition,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		return LoadPlanBuildingHelper.buildStandardCompositeFetch( this, attributeDefinition, loadPlanBuildingContext );
+	}
+
+	@Override
+	public void injectIdentifierDescription(IdentifierDescription identifierDescription) {
+		this.identifierDescription = identifierDescription;
+	}
+
+	@Override
+	public void hydrate(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException {
+		EntityKey entityKey = context.getDictatedRootEntityKey();
+		if ( entityKey != null ) {
+			context.getIdentifierResolutionContext( this ).registerEntityKey( entityKey );
+			return;
+		}
+
+		identifierDescription.hydrate( resultSet, context );
+
+		for ( Fetch fetch : getFetches() ) {
+			fetch.hydrate( resultSet, context );
+		}
+	}
+
+	@Override
+	public EntityKey resolve(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException {
+		final ResultSetProcessingContext.IdentifierResolutionContext identifierResolutionContext = context.getIdentifierResolutionContext( this );
+		EntityKey entityKey = identifierResolutionContext.getEntityKey();
+		if ( entityKey == null ) {
+			entityKey = identifierDescription.resolve( resultSet, context );
+			if ( entityKey == null ) {
+				// register the non-existence (though only for one-to-one associations)
+				if ( associationType.isOneToOne() ) {
+					// first, find our owner's entity-key...
+					final EntityKey ownersEntityKey = context.getIdentifierResolutionContext( (EntityReference) getOwner() ).getEntityKey();
+					if ( ownersEntityKey != null ) {
+						context.getSession().getPersistenceContext()
+								.addNullProperty( ownersEntityKey, associationType.getPropertyName() );
+					}
+				}
+			}
+
+			identifierResolutionContext.registerEntityKey( entityKey );
+
+			for ( Fetch fetch : getFetches() ) {
+				fetch.resolve( resultSet, context );
+			}
+		}
+
+		return entityKey;
+	}
+
+	public EntityKey resolveInIdentifier(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException {
+		// todo : may not need to do this if entitykey is already part of the resolution context
+
+		final EntityKey entityKey = resolve( resultSet, context );
+
+		final Object existing = context.getSession().getEntityUsingInterceptor( entityKey );
+
+		if ( existing != null ) {
+			if ( !persister.isInstance( existing ) ) {
+				throw new WrongClassException(
+						"loaded object was of wrong class " + existing.getClass(),
+						entityKey.getIdentifier(),
+						persister.getEntityName()
+				);
+			}
+
+			if ( getLockMode() != null && getLockMode() != LockMode.NONE ) {
+				final boolean isVersionCheckNeeded = persister.isVersioned()
+						&& context.getSession().getPersistenceContext().getEntry( existing ).getLockMode().lessThan( getLockMode() );
+
+				// we don't need to worry about existing version being uninitialized because this block isn't called
+				// by a re-entrant load (re-entrant loads _always_ have lock mode NONE)
+				if ( isVersionCheckNeeded ) {
+					//we only check the version when _upgrading_ lock modes
+					context.checkVersion(
+							resultSet,
+							persister,
+							entityAliases,
+							entityKey,
+							existing
+					);
+					//we need to upgrade the lock mode to the mode requested
+					context.getSession().getPersistenceContext().getEntry( existing ).setLockMode( getLockMode() );
+				}
+			}
+		}
+		else {
+			final String concreteEntityTypeName = context.getConcreteEntityTypeName(
+					resultSet,
+					persister,
+					entityAliases,
+					entityKey
+			);
+
+			final Object entityInstance = context.getSession().instantiate(
+					concreteEntityTypeName,
+					entityKey.getIdentifier()
+			);
+
+			//need to hydrate it.
+
+			// grab its state from the ResultSet and keep it in the Session
+			// (but don't yet initialize the object itself)
+			// note that we acquire LockMode.READ even if it was not requested
+			LockMode acquiredLockMode = getLockMode() == LockMode.NONE ? LockMode.READ : getLockMode();
+
+			context.loadFromResultSet(
+					resultSet,
+					entityInstance,
+					concreteEntityTypeName,
+					entityKey,
+					entityAliases,
+					acquiredLockMode,
+					persister,
+					getFetchStrategy().getTiming() == FetchTiming.IMMEDIATE,
+					associationType
+			);
+
+			// materialize associations (and initialize the object) later
+			context.registerHydratedEntity( persister, entityKey, entityInstance );
+		}
+
+		return entityKey;
+	}
+
+	@Override
+	public String toString() {
+		return "EntityFetch(" + getPropertyPath().getFullPath() + " -> " + persister.getEntityName() + ")";
+	}
 }

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/EntityIndexGraph.java

@@ -0,0 +1,150 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.loader.plan.spi;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.hibernate.LockMode;
+import org.hibernate.engine.FetchStrategy;
+import org.hibernate.engine.spi.SessionFactoryImplementor;
+import org.hibernate.loader.PropertyPath;
+import org.hibernate.loader.plan.internal.LoadPlanBuildingHelper;
+import org.hibernate.persister.collection.CollectionPersister;
+import org.hibernate.persister.entity.EntityPersister;
+import org.hibernate.persister.walking.spi.AssociationAttributeDefinition;
+import org.hibernate.persister.walking.spi.CompositionDefinition;
+import org.hibernate.type.AssociationType;
+
+/**
+ * @author Steve Ebersole
+ */
+public class EntityIndexGraph extends AbstractPlanNode implements FetchOwner, EntityReference {
+	private final CollectionReference collectionReference;
+	private final CollectionPersister collectionPersister;
+	private final AssociationType indexType;
+	private final EntityPersister indexPersister;
+	private final PropertyPath propertyPath;
+
+	private List<Fetch> fetches;
+
+	private IdentifierDescription identifierDescription;
+
+	public EntityIndexGraph(
+			SessionFactoryImplementor sessionFactory,
+			CollectionReference collectionReference,
+			PropertyPath collectionPath) {
+		super( sessionFactory );
+		this.collectionReference = collectionReference;
+		this.collectionPersister = collectionReference.getCollectionPersister();
+		this.indexType = (AssociationType) collectionPersister.getIndexType();
+		this.indexPersister = (EntityPersister) this.indexType.getAssociatedJoinable( sessionFactory() );
+		this.propertyPath = collectionPath.append( "<index>" ); // todo : do we want the <index> part?
+	}
+
+	@Override
+	public String getAlias() {
+		return null;
+	}
+
+	@Override
+	public LockMode getLockMode() {
+		return null;
+	}
+
+	@Override
+	public EntityPersister getEntityPersister() {
+		return indexPersister;
+	}
+
+	@Override
+	public IdentifierDescription getIdentifierDescription() {
+		return identifierDescription;
+	}
+
+	@Override
+	public void addFetch(Fetch fetch) {
+		if ( fetches == null ) {
+			fetches = new ArrayList<Fetch>();
+		}
+		fetches.add( fetch );
+	}
+
+	@Override
+	public Fetch[] getFetches() {
+		return fetches == null ? NO_FETCHES : fetches.toArray( new Fetch[ fetches.size() ] );
+	}
+
+	@Override
+	public void validateFetchPlan(FetchStrategy fetchStrategy) {
+	}
+
+	@Override
+	public EntityPersister retrieveFetchSourcePersister() {
+		return indexPersister;
+	}
+
+	@Override
+	public PropertyPath getPropertyPath() {
+		return propertyPath;
+	}
+
+	@Override
+	public CollectionFetch buildCollectionFetch(
+			AssociationAttributeDefinition attributeDefinition,
+			FetchStrategy fetchStrategy,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		return LoadPlanBuildingHelper.buildStandardCollectionFetch(
+				this,
+				attributeDefinition,
+				fetchStrategy,
+				loadPlanBuildingContext
+		);
+	}
+
+	@Override
+	public EntityFetch buildEntityFetch(
+			AssociationAttributeDefinition attributeDefinition,
+			FetchStrategy fetchStrategy,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		return LoadPlanBuildingHelper.buildStandardEntityFetch(
+				this,
+				attributeDefinition,
+				fetchStrategy,
+				loadPlanBuildingContext
+		);
+	}
+
+	@Override
+	public CompositeFetch buildCompositeFetch(
+			CompositionDefinition attributeDefinition,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		return LoadPlanBuildingHelper.buildStandardCompositeFetch( this, attributeDefinition, loadPlanBuildingContext );
+	}
+
+	@Override
+	public void injectIdentifierDescription(IdentifierDescription identifierDescription) {
+		this.identifierDescription = identifierDescription;
+	}
+}

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/EntityReference.java

@@ -24,7 +24,6 @@
 package org.hibernate.loader.plan.spi;
 
 import org.hibernate.LockMode;
-import org.hibernate.loader.EntityAliases;
 import org.hibernate.persister.entity.EntityPersister;
 
 /**
@@ -32,7 +31,7 @@ import org.hibernate.persister.entity.EntityPersister;
  *
  * @author Steve Ebersole
  */
-public interface EntityReference {
+public interface EntityReference extends IdentifierDescriptionInjectable {
 	/**
 	 * Retrieve the alias associated with the persister (entity/collection).
 	 *
@@ -54,20 +53,5 @@ public interface EntityReference {
 	 */
 	public EntityPersister getEntityPersister();
 
-	/**
-	 * Returns the description of the aliases in the JDBC ResultSet that identify values "belonging" to the this entity.
-	 *
-	 * @return The ResultSet alias descriptor.
-	 */
-	public EntityAliases getEntityAliases();
-
-	/**
-	 * Obtain the SQL table alias associated with this entity.
-	 *
-	 * TODO : eventually this needs to not be a String, but a representation like I did for the Antlr3 branch
-	 * 		(AliasRoot, I think it was called)
-	 *
-	 * @return The SQL table alias for this entity
-	 */
-	public String getSqlTableAlias();
+	public IdentifierDescription getIdentifierDescription();
 }

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/EntityReturn.java

@@ -23,12 +23,25 @@
  */
 package org.hibernate.loader.plan.spi;
 
+import java.io.Serializable;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+import org.hibernate.HibernateException;
 import org.hibernate.LockMode;
 import org.hibernate.engine.FetchStrategy;
+import org.hibernate.engine.spi.EntityKey;
 import org.hibernate.engine.spi.SessionFactoryImplementor;
 import org.hibernate.loader.EntityAliases;
 import org.hibernate.loader.PropertyPath;
+import org.hibernate.loader.internal.ResultSetProcessorHelper;
+import org.hibernate.loader.plan.internal.LoadPlanBuildingHelper;
+import org.hibernate.loader.spi.ResultSetProcessingContext;
 import org.hibernate.persister.entity.EntityPersister;
+import org.hibernate.persister.walking.spi.AssociationAttributeDefinition;
+import org.hibernate.persister.walking.spi.CompositionDefinition;
+
+import static org.hibernate.loader.spi.ResultSetProcessingContext.IdentifierResolutionContext;
 
 /**
  * @author Steve Ebersole
@@ -41,6 +54,8 @@ public class EntityReturn extends AbstractFetchOwner implements Return, FetchOwn
 
 	private final PropertyPath propertyPath = new PropertyPath(); // its a root
 
+	private IdentifierDescription identifierDescription;
+
 	public EntityReturn(
 			SessionFactoryImplementor sessionFactory,
 			String alias,
@@ -71,13 +86,8 @@ public class EntityReturn extends AbstractFetchOwner implements Return, FetchOwn
 	}
 
 	@Override
-	public EntityAliases getEntityAliases() {
-		return entityAliases;
-	}
-
-	@Override
-	public String getSqlTableAlias() {
-		return sqlTableAlias;
+	public IdentifierDescription getIdentifierDescription() {
+		return identifierDescription;
 	}
 
 	@Override
@@ -93,4 +103,83 @@ public class EntityReturn extends AbstractFetchOwner implements Return, FetchOwn
 	public PropertyPath getPropertyPath() {
 		return propertyPath;
 	}
+
+	@Override
+	public CollectionFetch buildCollectionFetch(
+			AssociationAttributeDefinition attributeDefinition,
+			FetchStrategy fetchStrategy,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		return LoadPlanBuildingHelper.buildStandardCollectionFetch(
+				this,
+				attributeDefinition,
+				fetchStrategy,
+				loadPlanBuildingContext
+		);
+	}
+
+	@Override
+	public EntityFetch buildEntityFetch(
+			AssociationAttributeDefinition attributeDefinition,
+			FetchStrategy fetchStrategy,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		return LoadPlanBuildingHelper.buildStandardEntityFetch(
+				this,
+				attributeDefinition,
+				fetchStrategy,
+				loadPlanBuildingContext
+		);
+	}
+
+	@Override
+	public CompositeFetch buildCompositeFetch(
+			CompositionDefinition attributeDefinition,
+			LoadPlanBuildingContext loadPlanBuildingContext) {
+		return LoadPlanBuildingHelper.buildStandardCompositeFetch( this, attributeDefinition, loadPlanBuildingContext );
+	}
+
+	@Override
+	public void hydrate(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException {
+		EntityKey entityKey = context.getDictatedRootEntityKey();
+		if ( entityKey != null ) {
+			context.getIdentifierResolutionContext( this ).registerEntityKey( entityKey );
+			return;
+		}
+
+		identifierDescription.hydrate( resultSet, context );
+
+		for ( Fetch fetch : getFetches() ) {
+			fetch.hydrate( resultSet, context );
+		}
+	}
+
+	@Override
+	public void resolve(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException {
+		final IdentifierResolutionContext identifierResolutionContext = context.getIdentifierResolutionContext( this );
+		EntityKey entityKey = identifierResolutionContext.getEntityKey();
+		if ( entityKey == null ) {
+			return;
+		}
+
+		entityKey = identifierDescription.resolve( resultSet, context );
+		identifierResolutionContext.registerEntityKey( entityKey );
+
+		for ( Fetch fetch : getFetches() ) {
+			fetch.resolve( resultSet, context );
+		}
+	}
+
+	@Override
+	public Object read(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException {
+		return null;
+	}
+
+	@Override
+	public void injectIdentifierDescription(IdentifierDescription identifierDescription) {
+		this.identifierDescription = identifierDescription;
+	}
+
+	@Override
+	public String toString() {
+		return "EntityReturn(" + persister.getEntityName() + ")";
+	}
 }

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/Fetch.java

@@ -23,8 +23,12 @@
  */
 package org.hibernate.loader.plan.spi;
 
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
 import org.hibernate.engine.FetchStrategy;
 import org.hibernate.loader.PropertyPath;
+import org.hibernate.loader.spi.ResultSetProcessingContext;
 
 /**
  * Contract for associations that are being fetched.
@@ -33,7 +37,7 @@ import org.hibernate.loader.PropertyPath;
  *
  * @author Steve Ebersole
  */
-public interface Fetch extends FetchOwner {
+public interface Fetch {
 	/**
 	 * Obtain the owner of this fetch.
 	 *
@@ -56,4 +60,8 @@ public interface Fetch extends FetchOwner {
 	 * @return The property path
 	 */
 	public PropertyPath getPropertyPath();
+
+	public void hydrate(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException;
+
+	public Object resolve(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException;
 }

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/FetchOwner.java

@@ -26,6 +26,8 @@ package org.hibernate.loader.plan.spi;
 import org.hibernate.engine.FetchStrategy;
 import org.hibernate.loader.PropertyPath;
 import org.hibernate.persister.entity.EntityPersister;
+import org.hibernate.persister.walking.spi.AssociationAttributeDefinition;
+import org.hibernate.persister.walking.spi.CompositionDefinition;
 
 /**
  * Contract for owners of fetches.  Any non-scalar return could be a fetch owner.
@@ -38,6 +40,14 @@ public interface FetchOwner {
 	 */
 	public static final Fetch[] NO_FETCHES = new Fetch[0];
 
+	/**
+	 * Contract to add fetches to this owner.  Care should be taken in calling this method; it is intended
+	 * for Hibernate usage
+	 *
+	 * @param fetch The fetch to add
+	 */
+	public void addFetch(Fetch fetch);
+
 	/**
 	 * Retrieve the fetches owned by this return.
 	 *
@@ -65,4 +75,19 @@ public interface FetchOwner {
 	 * @return The property path
 	 */
 	public PropertyPath getPropertyPath();
+
+	public CollectionFetch buildCollectionFetch(
+			AssociationAttributeDefinition attributeDefinition,
+			FetchStrategy fetchStrategy,
+			LoadPlanBuildingContext loadPlanBuildingContext);
+
+	public EntityFetch buildEntityFetch(
+			AssociationAttributeDefinition attributeDefinition,
+			FetchStrategy fetchStrategy,
+			LoadPlanBuildingContext loadPlanBuildingContext);
+
+	public CompositeFetch buildCompositeFetch(
+			CompositionDefinition attributeDefinition,
+			LoadPlanBuildingContext loadPlanBuildingContext);
+
 }

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/IdentifierDescription.java

@@ -0,0 +1,41 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.loader.plan.spi;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+import org.hibernate.engine.spi.EntityKey;
+import org.hibernate.loader.spi.ResultSetProcessingContext;
+
+/**
+ * @author Steve Ebersole
+ */
+public interface IdentifierDescription {
+	public Fetch[] getFetches();
+
+	public void hydrate(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException;
+
+	public EntityKey resolve(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException;
+}

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/IdentifierDescriptionInjectable.java

@@ -0,0 +1,33 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.loader.plan.spi;
+
+/**
+ * Ugh
+ *
+ * @author Steve Ebersole
+ */
+public interface IdentifierDescriptionInjectable {
+	public void injectIdentifierDescription(IdentifierDescription identifierDescription);
+}

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/LoadPlan.java

@@ -55,6 +55,7 @@ public interface LoadPlan {
 
 	public List<Return> getReturns();
 
+
 	// todo : would also like to see "call back" style access for handling "subsequent actions" such as:
 	// 		1) follow-on locking
 	//		2) join fetch conversions to subselect fetches

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/LoadPlanBuildingContext.java

@@ -0,0 +1,48 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.loader.plan.spi;
+
+import org.hibernate.engine.spi.SessionFactoryImplementor;
+import org.hibernate.loader.CollectionAliases;
+import org.hibernate.loader.EntityAliases;
+import org.hibernate.persister.walking.spi.AssociationAttributeDefinition;
+import org.hibernate.persister.walking.spi.CollectionDefinition;
+import org.hibernate.persister.walking.spi.CompositionDefinition;
+import org.hibernate.persister.walking.spi.EntityDefinition;
+
+/**
+ * @author Steve Ebersole
+ */
+public interface LoadPlanBuildingContext {
+	public SessionFactoryImplementor getSessionFactory();
+
+	public CollectionAliases resolveCollectionColumnAliases(AssociationAttributeDefinition attributeDefinition);
+	public EntityAliases resolveEntityColumnAliases(AssociationAttributeDefinition attributeDefinition);
+
+	public String resolveRootSourceAlias(EntityDefinition definition);
+	public String resolveRootSourceAlias(CollectionDefinition definition);
+
+	public String resolveFetchSourceAlias(AssociationAttributeDefinition attributeDefinition);
+	public String resolveFetchSourceAlias(CompositionDefinition compositionDefinition);
+}

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/LoadPlanVisitationStrategy.java

@@ -26,16 +26,16 @@ package org.hibernate.loader.plan.spi;
 /**
  * @author Steve Ebersole
  */
-public interface ReturnVisitationStrategy {
+public interface LoadPlanVisitationStrategy {
 	/**
 	 * Notification we are preparing to start visitation.
 	 */
-	public void start();
+	public void start(LoadPlan loadPlan);
 
 	/**
 	 * Notification we are finished visitation.
 	 */
-	public void finish();
+	public void finish(LoadPlan loadPlan);
 
 	/**
 	 * Notification that a new root return branch is being started.  Will be followed by calls to one of the following

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/LoadPlanVisitationStrategyAdapter.java

@@ -0,0 +1,104 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.loader.plan.spi;
+
+/**
+ * @author Steve Ebersole
+ */
+public class LoadPlanVisitationStrategyAdapter implements LoadPlanVisitationStrategy {
+	@Override
+	public void start(LoadPlan loadPlan) {
+		//To change body of implemented methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public void finish(LoadPlan loadPlan) {
+		//To change body of implemented methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public void startingRootReturn(Return rootReturn) {
+		//To change body of implemented methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public void finishingRootReturn(Return rootReturn) {
+		//To change body of implemented methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public void handleScalarReturn(ScalarReturn scalarReturn) {
+		//To change body of implemented methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public void handleEntityReturn(EntityReturn rootEntityReturn) {
+		//To change body of implemented methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public void handleCollectionReturn(CollectionReturn rootCollectionReturn) {
+		//To change body of implemented methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public void startingFetches(FetchOwner fetchOwner) {
+		//To change body of implemented methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public void finishingFetches(FetchOwner fetchOwner) {
+		//To change body of implemented methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public void startingEntityFetch(EntityFetch entityFetch) {
+		//To change body of implemented methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public void finishingEntityFetch(EntityFetch entityFetch) {
+		//To change body of implemented methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public void startingCollectionFetch(CollectionFetch collectionFetch) {
+		//To change body of implemented methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public void finishingCollectionFetch(CollectionFetch collectionFetch) {
+		//To change body of implemented methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public void startingCompositeFetch(CompositeFetch fetch) {
+		//To change body of implemented methods use File | Settings | File Templates.
+	}
+
+	@Override
+	public void finishingCompositeFetch(CompositeFetch fetch) {
+		//To change body of implemented methods use File | Settings | File Templates.
+	}
+}

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/LoadPlanVisitor.java

@@ -28,25 +28,25 @@ package org.hibernate.loader.plan.spi;
  *
  * @author Steve Ebersole
  */
-public class ReturnVisitor {
-	public static void visit(Return[] rootReturns, ReturnVisitationStrategy strategy) {
-		new ReturnVisitor( strategy ).visitReturns( rootReturns );
+public class LoadPlanVisitor {
+	public static void visit(LoadPlan loadPlan, LoadPlanVisitationStrategy strategy) {
+		new LoadPlanVisitor( strategy ).visit( loadPlan );
 	}
 
-	private final ReturnVisitationStrategy strategy;
+	private final LoadPlanVisitationStrategy strategy;
 
-	public ReturnVisitor(ReturnVisitationStrategy strategy) {
+	public LoadPlanVisitor(LoadPlanVisitationStrategy strategy) {
 		this.strategy = strategy;
 	}
 
-	private void visitReturns(Return[] rootReturns) {
-		strategy.start();
+	private void visit(LoadPlan loadPlan) {
+		strategy.start( loadPlan );
 
-		for ( Return rootReturn : rootReturns ) {
+		for ( Return rootReturn : loadPlan.getReturns() ) {
 			visitRootReturn( rootReturn );
 		}
 
-		strategy.finish();
+		strategy.finish( loadPlan );
 	}
 
 	private void visitRootReturn(Return rootReturn) {
@@ -69,7 +69,9 @@ public class ReturnVisitor {
 		}
 		else if ( CollectionReturn.class.isInstance( rootReturn ) ) {
 			strategy.handleCollectionReturn( (CollectionReturn) rootReturn );
-			visitFetches( (CollectionReturn) rootReturn );
+			final CollectionReturn collectionReturn = (CollectionReturn) rootReturn;
+			visitFetches( collectionReturn.getIndexGraph() );
+			visitFetches( collectionReturn.getElementGraph() );
 		}
 		else {
 			throw new IllegalStateException(
@@ -92,17 +94,18 @@ public class ReturnVisitor {
 	private void visitFetch(Fetch fetch) {
 		if ( EntityFetch.class.isInstance( fetch ) ) {
 			strategy.startingEntityFetch( (EntityFetch) fetch );
-			visitFetches( fetch );
+			visitFetches( (EntityFetch) fetch );
 			strategy.finishingEntityFetch( (EntityFetch) fetch );
 		}
 		else if ( CollectionFetch.class.isInstance( fetch ) ) {
 			strategy.startingCollectionFetch( (CollectionFetch) fetch );
-			visitFetches( fetch );
+			visitFetches( ( (CollectionFetch) fetch ).getIndexGraph() );
+			visitFetches( ( (CollectionFetch) fetch ).getElementGraph() );
 			strategy.finishingCollectionFetch( (CollectionFetch) fetch );
 		}
 		else if ( CompositeFetch.class.isInstance( fetch ) ) {
 			strategy.startingCompositeFetch( (CompositeFetch) fetch );
-			visitFetches( fetch );
+			visitFetches( (CompositeFetch) fetch );
 			strategy.finishingCompositeFetch( (CompositeFetch) fetch );
 		}
 		else {

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/Return.java

@@ -23,12 +23,15 @@
  */
 package org.hibernate.loader.plan.spi;
 
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+import org.hibernate.loader.spi.ResultSetProcessingContext;
+
 /**
  * Represents a return value in the query results.  Not the same as a result (column) in the JDBC ResultSet!
  * <p/>
- * This is merely a unifying contract; it defines no behavior.
- * <p/>
- * Return is distinctly different from a {@link Fetch}.
+ * Return is distinctly different from a {@link Fetch} and so modeled as completely separate hierarchy.
  *
  * @see ScalarReturn
  * @see EntityReturn
@@ -37,4 +40,28 @@ package org.hibernate.loader.plan.spi;
  * @author Steve Ebersole
  */
 public interface Return {
+	public void hydrate(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException;
+
+	/**
+	 * Effectively performs first phase of two-phase loading.  For scalar results first/second phase is one.  For
+	 * entities, first phase is to resolve identifiers; second phase is to resolve the entity instances.
+	 *
+	 * @param resultSet The result set being processed
+	 * @param context The context for the processing
+	 *
+	 * @throws SQLException Indicates a problem access the JDBC result set
+	 */
+	public void resolve(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException;
+
+	/**
+	 * Essentially performs the second phase of two-phase loading.
+	 *
+	 * @param resultSet The result set being processed
+	 * @param context The context for the processing
+	 *
+	 * @return The read object
+	 *
+	 * @throws SQLException Indicates a problem access the JDBC result set
+	 */
+	public Object read(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException;
 }

hibernate-core/src/main/java/org/hibernate/loader/plan/spi/ScalarReturn.java

@@ -23,7 +23,12 @@
  */
 package org.hibernate.loader.plan.spi;
 
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
 import org.hibernate.engine.spi.SessionFactoryImplementor;
+import org.hibernate.loader.internal.ResultSetProcessingContextImpl;
+import org.hibernate.loader.spi.ResultSetProcessingContext;
 import org.hibernate.type.Type;
 
 /**
@@ -34,19 +39,30 @@ import org.hibernate.type.Type;
  */
 public class ScalarReturn extends AbstractPlanNode implements Return {
 	private final Type type;
-	private final String columnAlias;
+	private final String[] columnAliases;
 
-	public ScalarReturn(SessionFactoryImplementor factory, Type type, String columnAlias) {
+	public ScalarReturn(SessionFactoryImplementor factory, Type type, String[] columnAliases) {
 		super( factory );
 		this.type = type;
-		this.columnAlias = columnAlias;
+		this.columnAliases = columnAliases;
 	}
 
 	public Type getType() {
 		return type;
 	}
 
-	public String getColumnAlias() {
-		return columnAlias;
+	@Override
+	public void hydrate(ResultSet resultSet, ResultSetProcessingContext context) {
+		// nothing to do
+	}
+
+	@Override
+	public void resolve(ResultSet resultSet, ResultSetProcessingContext context) {
+		// nothing to do
+	}
+
+	@Override
+	public Object read(ResultSet resultSet, ResultSetProcessingContext context) throws SQLException {
+		return type.nullSafeGet( resultSet, columnAliases, context.getSession(), null );
 	}
 }

hibernate-core/src/main/java/org/hibernate/loader/spi/AfterLoadAction.java

@@ -0,0 +1,34 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.loader.spi;
+
+import org.hibernate.engine.spi.SessionImplementor;
+import org.hibernate.persister.entity.Loadable;
+
+/**
+* @author Steve Ebersole
+*/
+public interface AfterLoadAction {
+	public void afterLoad(SessionImplementor session, Object entity, Loadable persister);
+}

hibernate-core/src/main/java/org/hibernate/loader/spi/Loader.java

@@ -33,28 +33,22 @@ import org.hibernate.loader.plan.spi.LoadPlan;
 import org.hibernate.transform.ResultTransformer;
 
 /**
- * Definition of the Loader contract.
- * <p/>
- * Capabilities I'd like to see added (todo):<ul>
- *     <li>
- *         expose the underlying "query" (although what I see here relies heavily on
- *         https://github.com/hibernate/hibernate-orm/wiki/Proposal---SQL-generation)
- *     </li>
- * </ul>
- *
+ * Definition of the Loader contract.  A Loader is intended to perform loading based on a query and a load-plan.
+ * Under the covers it uses many delegates to perform that work that might be better used individually in
+ * different situations.  In general, Loader is intended for being fed a set of results and processing through
+ * all of those result rows in one swoop.  For cases that do not fit that template, it is probably better to
+ * individually use the delegates to perform the work.
  *
  * @author Gavin King
  * @author Steve Ebersole
  */
 public interface Loader {
-	public LoadPlan getLoadPlan();
-
 	/**
-	 * Obtain the on-demand form of this loader, if possible.
+	 * Obtain the LoadPlan this Loader is following.
 	 *
-	 * @return The on-demand version of this loader
+	 * @return
 	 */
-	public OnDemandLoader asOnDemandLoader();
+	public LoadPlan getLoadPlan();
 
 	public List extractResults(
 			ResultSet resultSet,

hibernate-core/src/main/java/org/hibernate/loader/spi/NamedParameterContext.java

@@ -0,0 +1,36 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.loader.spi;
+
+/**
+ * The context for named parameters.
+ * <p/>
+ * NOTE : the hope with the SQL-redesign stuff is that this whole concept goes away, the idea being that
+ * the parameters are encoded into the query tree and "bind themselves".
+ *
+ * @author Steve Ebersole
+ */
+public interface NamedParameterContext {
+	public int[] getNamedParameterLocations(String name);
+}

hibernate-core/src/main/java/org/hibernate/loader/spi/OnDemandResultSetProcessor.java

@@ -1,7 +1,7 @@
 /*
  * Hibernate, Relational Persistence for Idiomatic Java
  *
- * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * Copyright (c) 2012, Red Hat Inc. or third-party contributors as
  * indicated by the @author tags or express copyright attribution
  * statements applied by the authors.  All third-party contributions are
  * distributed under license by Red Hat Inc.
@@ -25,22 +25,24 @@ package org.hibernate.loader.spi;
 
 import java.sql.ResultSet;
 
-import org.hibernate.HibernateException;
 import org.hibernate.engine.spi.QueryParameters;
 import org.hibernate.engine.spi.SessionImplementor;
 
 /**
- * Represents an on-demand loading strategy as need for processing single *logical* rows one at a time as required
- * for {@link org.hibernate.ScrollableResults} implementations.
+ * Contract for processing JDBC ResultSets a single logical row at a time.  These are intended for use by
+ * {@link org.hibernate.ScrollableResults} implementations.
+ *
+ * NOTE : these methods initially taken directly from {@link org.hibernate.loader.Loader} counterparts in an effort
+ * to break Loader into manageable pieces, especially in regards to the processing of result sets.
  *
  * @author Steve Ebersole
  */
-public interface OnDemandLoader {
+public interface OnDemandResultSetProcessor {
 
 	/**
-	 * Given a ResultSet, extract just a single result row.
+	 * Give a ResultSet, extract just a single result row.
 	 *
-	 * Copy of {@link org.hibernate.loader.Loader#loadSingleRow(ResultSet, SessionImplementor, QueryParameters, boolean)}
+	 * Copy of {@link org.hibernate.loader.Loader#loadSingleRow(java.sql.ResultSet, org.hibernate.engine.spi.SessionImplementor, org.hibernate.engine.spi.QueryParameters, boolean)}
 	 * but dropping the 'returnProxies' (that method has only one use in the entire codebase and it always passes in
 	 * false...)
 	 *
@@ -50,19 +52,19 @@ public interface OnDemandLoader {
 	 *
 	 * @return The extracted result row
 	 *
-	 * @throws HibernateException Indicates a problem extracting values from the result set.
+	 * @throws org.hibernate.HibernateException Indicates a problem extracting values from the result set.
 	 */
 	public Object extractSingleRow(
 			ResultSet resultSet,
 			SessionImplementor session,
-			QueryParameters queryParameters) throws HibernateException;
+			QueryParameters queryParameters);
 
 	/**
 	 * Given a ResultSet extract "sequential rows".  This is used in cases where we have multi-row fetches that
 	 * are sequential within the ResultSet due to ordering.  Multiple ResultSet rows are read into a single query
 	 * result "row".
 	 *
-	 * Copy of {@link org.hibernate.loader.Loader#loadSequentialRowsForward(ResultSet, SessionImplementor, QueryParameters, boolean)}
+	 * Copy of {@link org.hibernate.loader.Loader#loadSequentialRowsForward(java.sql.ResultSet, org.hibernate.engine.spi.SessionImplementor, org.hibernate.engine.spi.QueryParameters, boolean)}
 	 * but dropping the 'returnProxies' (that method has only one use in the entire codebase and it always passes in
 	 * false...)
 	 *
@@ -77,12 +79,12 @@ public interface OnDemandLoader {
 	public Object extractSequentialRowsForward(
 			final ResultSet resultSet,
 			final SessionImplementor session,
-			final QueryParameters queryParameters) throws HibernateException;
+			final QueryParameters queryParameters);
 
 	/**
 	 * Like {@link #extractSequentialRowsForward} but here moving back through the ResultSet.
 	 *
-	 * Copy of {@link org.hibernate.loader.Loader#loadSequentialRowsReverse(ResultSet, SessionImplementor, QueryParameters, boolean, boolean)}
+	 * Copy of {@link org.hibernate.loader.Loader#loadSequentialRowsReverse(java.sql.ResultSet, org.hibernate.engine.spi.SessionImplementor, org.hibernate.engine.spi.QueryParameters, boolean, boolean)}
 	 * but dropping the 'returnProxies' (that method has only one use in the entire codebase and it always passes in
 	 * false...).
 	 *
@@ -101,5 +103,5 @@ public interface OnDemandLoader {
 			ResultSet resultSet,
 			SessionImplementor session,
 			QueryParameters queryParameters,
-			boolean isLogicallyAfterLast) throws HibernateException;
+			boolean isLogicallyAfterLast);
 }

hibernate-core/src/main/java/org/hibernate/loader/spi/ResultBuilder.java

@@ -0,0 +1,7 @@
+package org.hibernate.loader.spi;
+
+/**
+ * @author Steve Ebersole
+ */
+public class ResultBuilder {
+}

hibernate-core/src/main/java/org/hibernate/loader/spi/ResultSetProcessingContext.java

@@ -0,0 +1,91 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.loader.spi;
+
+import java.io.Serializable;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.List;
+
+import org.hibernate.LockMode;
+import org.hibernate.engine.spi.EntityKey;
+import org.hibernate.engine.spi.QueryParameters;
+import org.hibernate.engine.spi.SessionImplementor;
+import org.hibernate.loader.EntityAliases;
+import org.hibernate.loader.plan.spi.EntityReference;
+import org.hibernate.loader.plan.spi.Return;
+import org.hibernate.persister.entity.EntityPersister;
+import org.hibernate.type.AssociationType;
+import org.hibernate.type.EntityType;
+
+/**
+ * @author Steve Ebersole
+ */
+public interface ResultSetProcessingContext {
+	public SessionImplementor getSession();
+
+	public QueryParameters getQueryParameters();
+
+	public EntityKey getDictatedRootEntityKey();
+
+	public IdentifierResolutionContext getIdentifierResolutionContext(EntityReference entityReference);
+
+	public static interface IdentifierResolutionContext {
+		public EntityReference getEntityReference();
+
+		public void registerHydratedForm(Serializable hydratedForm);
+
+		public Serializable getHydratedForm();
+
+		public void registerEntityKey(EntityKey entityKey);
+
+		public EntityKey getEntityKey();
+	}
+
+	public void registerHydratedEntity(EntityPersister persister, EntityKey entityKey, Object entityInstance);
+
+	public void checkVersion(
+			ResultSet resultSet,
+			EntityPersister persister,
+			EntityAliases entityAliases,
+			EntityKey entityKey,
+			Object entityInstance) throws SQLException;
+
+	public String getConcreteEntityTypeName(
+			ResultSet resultSet,
+			EntityPersister persister,
+			EntityAliases entityAliases,
+			EntityKey entityKey) throws SQLException;
+
+	public void loadFromResultSet(
+			ResultSet resultSet,
+			Object entityInstance,
+			String concreteEntityTypeName,
+			EntityKey entityKey,
+			EntityAliases entityAliases,
+			LockMode acquiredLockMode,
+			EntityPersister persister,
+			boolean eagerFetch,
+			EntityType associationType) throws SQLException;
+}

hibernate-core/src/main/java/org/hibernate/loader/spi/ResultSetProcessor.java

@@ -0,0 +1,70 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2012, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.loader.spi;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.List;
+
+import org.hibernate.engine.spi.QueryParameters;
+import org.hibernate.engine.spi.SessionImplementor;
+import org.hibernate.transform.ResultTransformer;
+
+/**
+ * Contract for processing JDBC ResultSets.  Separated because ResultSets can be chained and we'd really like to
+ * reuse this logic across all result sets.
+ * <p/>
+ * todo : investigate having this work with non-JDBC results; maybe just typed as Object? or a special Result contract?
+ *
+ * @author Steve Ebersole
+ */
+public interface ResultSetProcessor {
+
+	public OnDemandResultSetProcessor toOnDemandForm();
+
+	/**
+	 * Process an entire ResultSet, performing all extractions.
+	 *
+	 * Semi-copy of {@link org.hibernate.loader.Loader#doQuery}, with focus on just the ResultSet processing bit.
+	 *
+	 * @param resultSet The result set being processed.
+	 * @param session The originating session
+	 * @param queryParameters The "parameters" used to build the query
+	 * @param returnProxies Can proxies be returned (not the same as can they be created!)
+	 * @param forcedResultTransformer My old "friend" ResultTransformer...
+	 *
+	 * @return The extracted results list.
+	 *
+	 * @throws java.sql.SQLException Indicates a problem access the JDBC ResultSet
+	 */
+	public List extractResults(
+			ResultSet resultSet,
+			SessionImplementor session,
+			QueryParameters queryParameters,
+			NamedParameterContext namedParameterContext,
+			boolean returnProxies,
+			boolean readOnly,
+			ResultTransformer forcedResultTransformer,
+			List<AfterLoadAction> afterLoadActions) throws SQLException;
+}

hibernate-core/src/main/java/org/hibernate/persister/collection/AbstractCollectionPersister.java

@@ -82,7 +82,7 @@ import org.hibernate.persister.entity.Queryable;
 import org.hibernate.persister.walking.spi.CollectionDefinition;
 import org.hibernate.persister.walking.spi.CollectionElementDefinition;
 import org.hibernate.persister.walking.spi.CollectionIndexDefinition;
-import org.hibernate.persister.walking.spi.CompositeDefinition;
+import org.hibernate.persister.walking.spi.CompositionDefinition;
 import org.hibernate.persister.walking.spi.EntityDefinition;
 import org.hibernate.pretty.MessageHelper;
 import org.hibernate.sql.Alias;
@@ -1974,7 +1974,7 @@ public abstract class AbstractCollectionPersister
 			}
 
 			@Override
-			public CompositeDefinition toCompositeDefinition() {
+			public CompositionDefinition toCompositeDefinition() {
 				if ( ! getType().isComponentType() ) {
 					throw new IllegalStateException( "Cannot treat entity collection index type as composite" );
 				}
@@ -2006,7 +2006,7 @@ public abstract class AbstractCollectionPersister
 			}
 
 			@Override
-			public CompositeDefinition toCompositeDefinition() {
+			public CompositionDefinition toCompositeDefinition() {
 				if ( ! getType().isComponentType() ) {
 					throw new IllegalStateException( "Cannot treat entity collection element type as composite" );
 				}

hibernate-core/src/main/java/org/hibernate/persister/entity/AbstractEntityPersister.java

@@ -110,6 +110,11 @@ import org.hibernate.metamodel.binding.SingularAttributeBinding;
 import org.hibernate.metamodel.relational.DerivedValue;
 import org.hibernate.metamodel.relational.Value;
 import org.hibernate.persister.walking.spi.AttributeDefinition;
+import org.hibernate.persister.walking.spi.AttributeSource;
+import org.hibernate.persister.walking.spi.EncapsulatedEntityIdentifierDefinition;
+import org.hibernate.persister.walking.spi.EntityDefinition;
+import org.hibernate.persister.walking.spi.EntityIdentifierDefinition;
+import org.hibernate.persister.walking.spi.NonEncapsulatedEntityIdentifierDefinition;
 import org.hibernate.pretty.MessageHelper;
 import org.hibernate.property.BackrefPropertyAccessor;
 import org.hibernate.sql.Alias;
@@ -5076,11 +5081,12 @@ public abstract class AbstractEntityPersister
 
 	// EntityDefinition impl ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
+	private EntityIdentifierDefinition entityIdentifierDefinition;
 	private Iterable<AttributeDefinition> embeddedCompositeIdentifierAttributes;
 	private Iterable<AttributeDefinition> attributeDefinitions;
 
 	protected void generateEntityDefinition() {
-		collectEmbeddedCompositeIdentifierAttributeDefinitions();
+		prepareEntityIdentifierDefinition();
 		collectAttributeDefinitions();
 	}
 
@@ -5090,8 +5096,8 @@ public abstract class AbstractEntityPersister
 	}
 
 	@Override
-	public Iterable<AttributeDefinition> getEmbeddedCompositeIdentifierAttributes() {
-		return embeddedCompositeIdentifierAttributes;
+	public EntityIdentifierDefinition getEntityKeyDefinition() {
+		return entityIdentifierDefinition;
 	}
 
 	@Override
@@ -5099,52 +5105,85 @@ public abstract class AbstractEntityPersister
 		return attributeDefinitions;
 	}
 
-	private synchronized void collectEmbeddedCompositeIdentifierAttributeDefinitions() {
+
+	private void prepareEntityIdentifierDefinition() {
 		final Type idType = getIdentifierType();
+
 		if ( !idType.isComponentType() ) {
+			entityIdentifierDefinition = buildEncapsulatedIdentifierDefinition();
 			return;
 		}
 
 		final CompositeType cidType = (CompositeType) idType;
 		if ( !cidType.isEmbedded() ) {
+			entityIdentifierDefinition = buildEncapsulatedIdentifierDefinition();
 			return;
 		}
 
-		// we have an embedded composite identifier.  Most likely we need to process the composite
-		// properties separately, although there is an edge case where the identifier is really
-		// a simple identifier (single value) wrapped in a JPA @IdClass or even in the case of a
-		// a simple identifier (single value) wrapped in a Hibernate composite type.
-		//
-		// We really do not have a built-in method to determine that.  However, generally the
-		// persister would report that there is single, physical identifier property which is
-		// explicitly at odds with the notion of "embedded composite".  So we use that for now
-		if ( getEntityMetamodel().getIdentifierProperty().isEmbedded() ) {
-			this.embeddedCompositeIdentifierAttributes = new Iterable<AttributeDefinition>() {
-				@Override
-				public Iterator<AttributeDefinition> iterator() {
-					return new Iterator<AttributeDefinition>() {
-						private final int numberOfAttributes = countSubclassProperties();
-						private int currentAttributeNumber = 0;
+		entityIdentifierDefinition = new NonEncapsulatedEntityIdentifierDefinition() {
+			@Override
+			public Iterable<AttributeDefinition> getAttributes() {
+				// todo : implement
+				throw new NotYetImplementedException();
+			}
 
-						@Override
-						public boolean hasNext() {
-							return currentAttributeNumber < numberOfAttributes;
-						}
+			@Override
+			public Class getSeparateIdentifierMappingClass() {
+				// todo : implement
+				throw new NotYetImplementedException();
+			}
 
-						@Override
-						public AttributeDefinition next() {
-							// todo : implement
-							throw new NotYetImplementedException();
-						}
+			@Override
+			public boolean isEncapsulated() {
+				return false;
+			}
 
-						@Override
-						public void remove() {
-							throw new UnsupportedOperationException( "Remove operation not supported here" );
-						}
-					};
-				}
-			};
-		}
+			@Override
+			public EntityDefinition getEntityDefinition() {
+				return AbstractEntityPersister.this;
+			}
+		};
+	}
+
+	private EntityIdentifierDefinition buildEncapsulatedIdentifierDefinition() {
+		final AttributeDefinition simpleIdentifierAttributeAdapter = new AttributeDefinition() {
+			@Override
+			public String getName() {
+				return entityMetamodel.getIdentifierProperty().getName();
+			}
+
+			@Override
+			public Type getType() {
+				return entityMetamodel.getIdentifierProperty().getType();
+			}
+
+			@Override
+			public AttributeSource getSource() {
+				return AbstractEntityPersister.this;
+			}
+
+			@Override
+			public String toString() {
+				return "<identifier-property:" + getName() + ">";
+			}
+		};
+
+		return new EncapsulatedEntityIdentifierDefinition() {
+			@Override
+			public AttributeDefinition getAttributeDefinition() {
+				return simpleIdentifierAttributeAdapter;
+			}
+
+			@Override
+			public boolean isEncapsulated() {
+				return true;
+			}
+
+			@Override
+			public EntityDefinition getEntityDefinition() {
+				return AbstractEntityPersister.this;
+			}
+		};
 	}
 
 	private void collectAttributeDefinitions() {

hibernate-core/src/main/java/org/hibernate/persister/spi/HydratedCompoundValueHandler.java

@@ -0,0 +1,44 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.persister.spi;
+
+/**
+ * Where to begin... :)
+ *
+ * This gets to the internal concept of 2-phase loading of entity data and how specifically it is done.  Essentially
+ * for composite values, the process of hydration results in a tuple array comprising the composition "atomic" values.
+ * For example, a Name component's hydrated state might look like {@code ["Steve", "L", "Ebersole"]}.
+ *
+ * There are times when we need to be able to extract individual pieces out of the hydrated tuple array.  For example,
+ * for an entity with a composite identifier part of which is an association (a key-many-to-one) we often need to
+ * attempt 2-phase processing on the association portion of the identifier's hydrated tuple array.
+ *
+ * This contract allows us access to portions of the hydrated tuple state.
+ *
+ * @author Steve Ebersole
+ */
+public interface HydratedCompoundValueHandler {
+	public Object extract(Object hydratedState);
+	public void inject(Object hydratedState, Object value);
+}

hibernate-core/src/main/java/org/hibernate/persister/walking/spi/AssociationAttributeDefinition.java

@@ -27,6 +27,7 @@ import org.hibernate.engine.FetchStrategy;
 import org.hibernate.engine.spi.CascadeStyle;
 import org.hibernate.engine.spi.LoadQueryInfluencers;
 import org.hibernate.loader.PropertyPath;
+import org.hibernate.persister.spi.HydratedCompoundValueHandler;
 
 /**
  * @author Steve Ebersole
@@ -43,4 +44,6 @@ public interface AssociationAttributeDefinition extends AttributeDefinition {
 	public FetchStrategy determineFetchPlan(LoadQueryInfluencers loadQueryInfluencers, PropertyPath propertyPath);
 
 	public CascadeStyle determineCascadeStyle();
+
+	public HydratedCompoundValueHandler getHydratedCompoundValueExtractor();
 }

hibernate-core/src/main/java/org/hibernate/persister/walking/spi/AssociationVisitationStrategy.java

@@ -40,11 +40,20 @@ public interface AssociationVisitationStrategy {
 	public void startingEntity(EntityDefinition entityDefinition);
 	public void finishingEntity(EntityDefinition entityDefinition);
 
+	public void startingEntityIdentifier(EntityIdentifierDefinition entityIdentifierDefinition);
+	public void finishingEntityIdentifier(EntityIdentifierDefinition entityIdentifierDefinition);
+
 	public void startingCollection(CollectionDefinition collectionDefinition);
 	public void finishingCollection(CollectionDefinition collectionDefinition);
 
-	public void startingComposite(CompositeDefinition compositeDefinition);
-	public void finishingComposite(CompositeDefinition compositeDefinition);
+	public void startingCollectionIndex(CollectionIndexDefinition collectionIndexDefinition);
+	public void finishingCollectionIndex(CollectionIndexDefinition collectionIndexDefinition);
+
+	public void startingCollectionElements(CollectionElementDefinition elementDefinition);
+	public void finishingCollectionElements(CollectionElementDefinition elementDefinition);
+
+	public void startingComposite(CompositionDefinition compositionDefinition);
+	public void finishingComposite(CompositionDefinition compositionDefinition);
 
 	public boolean startingAttribute(AttributeDefinition attributeDefinition);
 	public void finishingAttribute(AttributeDefinition attributeDefinition);

hibernate-core/src/main/java/org/hibernate/persister/walking/spi/CollectionElementDefinition.java

@@ -35,5 +35,5 @@ public interface CollectionElementDefinition {
 
 	public EntityDefinition toEntityDefinition();
 
-	public CompositeDefinition toCompositeDefinition();
+	public CompositionDefinition toCompositeDefinition();
 }

hibernate-core/src/main/java/org/hibernate/persister/walking/spi/CollectionIndexDefinition.java

@@ -35,5 +35,5 @@ public interface CollectionIndexDefinition {
 
 	public EntityDefinition toEntityDefinition();
 
-	public CompositeDefinition toCompositeDefinition();
+	public CompositionDefinition toCompositeDefinition();
 }

hibernate-core/src/main/java/org/hibernate/persister/walking/spi/CompositionDefinition.java

@@ -26,5 +26,5 @@ package org.hibernate.persister.walking.spi;
 /**
  * @author Steve Ebersole
  */
-public interface CompositeDefinition extends AttributeDefinition, AttributeSource {
+public interface CompositionDefinition extends AttributeDefinition, AttributeSource {
 }

hibernate-core/src/main/java/org/hibernate/persister/walking/spi/EncapsulatedEntityIdentifierDefinition.java

@@ -0,0 +1,31 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.persister.walking.spi;
+
+/**
+ * @author Steve Ebersole
+ */
+public interface EncapsulatedEntityIdentifierDefinition extends EntityIdentifierDefinition {
+	public AttributeDefinition getAttributeDefinition();
+}

hibernate-core/src/main/java/org/hibernate/persister/walking/spi/EntityDefinition.java

@@ -32,5 +32,5 @@ import org.hibernate.persister.entity.EntityPersister;
  */
 public interface EntityDefinition extends AttributeSource {
 	public EntityPersister getEntityPersister();
-	public Iterable<AttributeDefinition> getEmbeddedCompositeIdentifierAttributes();
+	public EntityIdentifierDefinition getEntityKeyDefinition();
 }

hibernate-core/src/main/java/org/hibernate/persister/walking/spi/EntityIdentifierDefinition.java

@@ -0,0 +1,43 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.persister.walking.spi;
+
+/**
+ * Describes aspects of the identifier for an entity
+ *
+ * @author Steve Ebersole
+ */
+public interface EntityIdentifierDefinition {
+	/**
+	 * Is the entity identifier encapsulated?  Meaning, is it represented by a single attribute?
+	 *
+	 * @return {@code true} indicates the identifier is encapsulated (and therefore this is castable to
+	 * {@link EncapsulatedEntityIdentifierDefinition}); {@code false} means it is not encapsulated (and therefore
+	 * castable to {@link NonEncapsulatedEntityIdentifierDefinition}).
+	 *
+	 */
+	public boolean isEncapsulated();
+
+	public EntityDefinition getEntityDefinition();
+}

hibernate-core/src/main/java/org/hibernate/persister/walking/spi/MetadataDrivenModelGraphVisitor.java

@@ -81,26 +81,26 @@ public class MetadataDrivenModelGraphVisitor {
 
 	private void visitEntityDefinition(EntityDefinition entityDefinition) {
 		strategy.startingEntity( entityDefinition );
-		try {
-			visitAttributes( entityDefinition );
-			optionallyVisitEmbeddedCompositeIdentifier( entityDefinition );
-		}
-		finally {
-			strategy.finishingEntity( entityDefinition );
-		}
+
+		visitAttributes( entityDefinition );
+		visitIdentifierDefinition( entityDefinition.getEntityKeyDefinition() );
+
+		strategy.finishingEntity( entityDefinition );
 	}
 
-	private void optionallyVisitEmbeddedCompositeIdentifier(EntityDefinition entityDefinition) {
-		// if the entity has a composite identifier, see if we need to handle its sub-properties separately
-		final Iterable<AttributeDefinition> embeddedCompositeIdentifierAttributes =
-				entityDefinition.getEmbeddedCompositeIdentifierAttributes();
-		if ( embeddedCompositeIdentifierAttributes == null ) {
-			return;
+	private void visitIdentifierDefinition(EntityIdentifierDefinition entityIdentifierDefinition) {
+		strategy.startingEntityIdentifier( entityIdentifierDefinition );
+
+		if ( entityIdentifierDefinition.isEncapsulated() ) {
+			visitAttributeDefinition( ( (EncapsulatedEntityIdentifierDefinition) entityIdentifierDefinition).getAttributeDefinition() );
+		}
+		else {
+			for ( AttributeDefinition attributeDefinition : ( (NonEncapsulatedEntityIdentifierDefinition) entityIdentifierDefinition).getAttributes() ) {
+				visitAttributeDefinition( attributeDefinition );
+			}
 		}
 
-		for ( AttributeDefinition attributeDefinition : embeddedCompositeIdentifierAttributes ) {
-			visitAttributeDefinition( attributeDefinition );
-		}
+		strategy.finishingEntityIdentifier( entityIdentifierDefinition );
 	}
 
 	private void visitAttributes(AttributeSource attributeSource) {
@@ -122,7 +122,7 @@ public class MetadataDrivenModelGraphVisitor {
 					visitAssociation( (AssociationAttributeDefinition) attributeDefinition );
 				}
 				else if ( attributeDefinition.getType().isComponentType() ) {
-					visitCompositeDefinition( (CompositeDefinition) attributeDefinition );
+					visitCompositeDefinition( (CompositionDefinition) attributeDefinition );
 				}
 			}
 			finally {
@@ -148,42 +148,34 @@ public class MetadataDrivenModelGraphVisitor {
 		}
 	}
 
-	private void visitCompositeDefinition(CompositeDefinition compositeDefinition) {
-		strategy.startingComposite( compositeDefinition );
-		try {
-			visitAttributes( compositeDefinition );
-		}
-		finally {
-			strategy.finishingComposite( compositeDefinition );
-		}
+	private void visitCompositeDefinition(CompositionDefinition compositionDefinition) {
+		strategy.startingComposite( compositionDefinition );
+
+		visitAttributes( compositionDefinition );
+
+		strategy.finishingComposite( compositionDefinition );
 	}
 
 	private void visitCollectionDefinition(CollectionDefinition collectionDefinition) {
 		strategy.startingCollection( collectionDefinition );
 
-		try {
-			visitCollectionIndex( collectionDefinition.getIndexDefinition() );
+		visitCollectionIndex( collectionDefinition );
+		visitCollectionElements( collectionDefinition );
 
-			final CollectionElementDefinition elementDefinition = collectionDefinition.getElementDefinition();
-			if ( elementDefinition.getType().isComponentType() ) {
-				visitCompositeDefinition( elementDefinition.toCompositeDefinition() );
-			}
-			else {
-				visitEntityDefinition( elementDefinition.toEntityDefinition() );
-			}
-		}
-		finally {
-			strategy.finishingCollection( collectionDefinition );
-		}
+		strategy.finishingCollection( collectionDefinition );
 	}
 
-	private void visitCollectionIndex(CollectionIndexDefinition collectionIndexDefinition) {
+	private void visitCollectionIndex(CollectionDefinition collectionDefinition) {
+		final CollectionIndexDefinition collectionIndexDefinition = collectionDefinition.getIndexDefinition();
 		if ( collectionIndexDefinition == null ) {
 			return;
 		}
 
-		log.debug( "Visiting collection index :  " + currentPropertyPath.getFullPath() );
-		currentPropertyPath = currentPropertyPath.append( "<key>" );
+		strategy.startingCollectionIndex( collectionIndexDefinition );
+
+		log.debug( "Visiting index for collection :  " + currentPropertyPath.getFullPath() );
+		currentPropertyPath = currentPropertyPath.append( "<index>" );
+
 		try {
 			final Type collectionIndexType = collectionIndexDefinition.getType();
 			if ( collectionIndexType.isComponentType() ) {
@@ -196,6 +188,22 @@ public class MetadataDrivenModelGraphVisitor {
 		finally {
 			currentPropertyPath = currentPropertyPath.getParent();
 		}
+
+		strategy.finishingCollectionIndex( collectionIndexDefinition );
+	}
+
+	private void visitCollectionElements(CollectionDefinition collectionDefinition) {
+		final CollectionElementDefinition elementDefinition = collectionDefinition.getElementDefinition();
+		strategy.startingCollectionElements( elementDefinition );
+
+		if ( elementDefinition.getType().isComponentType() ) {
+			visitCompositeDefinition( elementDefinition.toCompositeDefinition() );
+		}
+		else {
+			visitEntityDefinition( elementDefinition.toEntityDefinition() );
+		}
+
+		strategy.finishingCollectionElements( elementDefinition );
 	}
 
 

hibernate-core/src/main/java/org/hibernate/persister/walking/spi/NonEncapsulatedEntityIdentifierDefinition.java

@@ -0,0 +1,33 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.persister.walking.spi;
+
+/**
+ * @author Steve Ebersole
+ */
+public interface NonEncapsulatedEntityIdentifierDefinition extends EntityIdentifierDefinition {
+	public Iterable<AttributeDefinition> getAttributes();
+
+	public Class getSeparateIdentifierMappingClass();
+}

hibernate-core/src/main/java/org/hibernate/persister/walking/spi/WalkingException.java

@@ -0,0 +1,41 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2013, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.persister.walking.spi;
+
+import org.hibernate.HibernateError;
+
+/**
+ * Indicates a problem walking the domain tree.  Almost always this indicates an internal error in Hibernate
+ *
+ * @author Steve Ebersole
+ */
+public class WalkingException extends HibernateError {
+	public WalkingException(String message) {
+		super( message );
+	}
+
+	public WalkingException(String message, Throwable root) {
+		super( message, root );
+	}
+}

hibernate-core/src/main/java/org/hibernate/result/internal/ResultImpl.java

@@ -37,6 +37,7 @@ import org.hibernate.engine.spi.SessionImplementor;
 import org.hibernate.loader.custom.CustomLoader;
 import org.hibernate.loader.custom.CustomQuery;
 import org.hibernate.loader.custom.sql.SQLQueryReturnProcessor;
+import org.hibernate.loader.spi.AfterLoadAction;
 import org.hibernate.result.NoMoreReturnsException;
 import org.hibernate.result.Result;
 import org.hibernate.result.Return;

hibernate-core/src/main/java/org/hibernate/tuple/AbstractNonIdentifierAttribute.java

@@ -126,8 +126,12 @@ public abstract class AbstractNonIdentifierAttribute extends AbstractAttribute i
 		return attributeInformation.getFetchMode();
 	}
 
+	protected String loggableMetadata() {
+		return "non-identifier";
+	}
+
 	@Override
 	public String toString() {
-		return "Attribute[non-identifier]( " + getName() + ")";
+		return "Attribute(name=" + getName() + ", type=" + getType().getName() + " [" + loggableMetadata() + "])";
 	}
 }

hibernate-core/src/main/java/org/hibernate/tuple/PropertyFactory.java

@@ -54,7 +54,7 @@ import org.hibernate.property.PropertyAccessor;
 import org.hibernate.property.PropertyAccessorFactory;
 import org.hibernate.tuple.entity.EntityBasedAssociationAttribute;
 import org.hibernate.tuple.entity.EntityBasedBasicAttribute;
-import org.hibernate.tuple.entity.EntityBasedCompositeAttribute;
+import org.hibernate.tuple.entity.EntityBasedCompositionAttribute;
 import org.hibernate.tuple.entity.VersionProperty;
 import org.hibernate.type.AssociationType;
 import org.hibernate.type.CompositeType;
@@ -282,7 +282,7 @@ public class PropertyFactory {
 				);
 			}
 			case COMPOSITE: {
-				return new EntityBasedCompositeAttribute(
+				return new EntityBasedCompositionAttribute(
 						persister,
 						sessionFactory,
 						attributeNumber,

hibernate-core/src/main/java/org/hibernate/tuple/component/AbstractCompositeBasedAttribute.java

@@ -39,7 +39,7 @@ public abstract class AbstractCompositeBasedAttribute
 	private final int ownerAttributeNumber;
 
 	public AbstractCompositeBasedAttribute(
-			AbstractCompositeDefinition source,
+			AbstractCompositionDefinition source,
 			SessionFactoryImplementor sessionFactory,
 			int attributeNumber,
 			String attributeName,
@@ -55,7 +55,7 @@ public abstract class AbstractCompositeBasedAttribute
 	}
 
 	@Override
-	public AbstractCompositeDefinition getSource() {
-		return (AbstractCompositeDefinition) super.getSource();
+	public AbstractCompositionDefinition getSource() {
+		return (AbstractCompositionDefinition) super.getSource();
 	}
 }

hibernate-core/src/main/java/org/hibernate/tuple/component/AbstractCompositionDefinition.java

@@ -32,7 +32,7 @@ import org.hibernate.persister.entity.OuterJoinLoadable;
 import org.hibernate.persister.walking.spi.AssociationKey;
 import org.hibernate.persister.walking.spi.AttributeDefinition;
 import org.hibernate.persister.walking.spi.AttributeSource;
-import org.hibernate.persister.walking.spi.CompositeDefinition;
+import org.hibernate.persister.walking.spi.CompositionDefinition;
 import org.hibernate.persister.walking.spi.EntityDefinition;
 import org.hibernate.tuple.AbstractNonIdentifierAttribute;
 import org.hibernate.tuple.BaselineAttributeInformation;
@@ -48,8 +48,9 @@ import static org.hibernate.engine.internal.JoinHelper.getRHSColumnNames;
 /**
  * @author Steve Ebersole
  */
-public abstract class AbstractCompositeDefinition extends AbstractNonIdentifierAttribute implements CompositeDefinition {
-	protected AbstractCompositeDefinition(
+public abstract class AbstractCompositionDefinition extends AbstractNonIdentifierAttribute implements
+																						   CompositionDefinition {
+	protected AbstractCompositionDefinition(
 			AttributeSource source,
 			SessionFactoryImplementor sessionFactory,
 			int attributeNumber,
@@ -119,41 +120,41 @@ public abstract class AbstractCompositeDefinition extends AbstractNonIdentifierA
 							}
 
 							return new CompositeBasedAssociationAttribute(
-									AbstractCompositeDefinition.this,
+									AbstractCompositionDefinition.this,
 									sessionFactory(),
 									currentAttributeNumber,
 									name,
 									(AssociationType) type,
 									new BaselineAttributeInformation.Builder()
-											.setInsertable( AbstractCompositeDefinition.this.isInsertable() )
-											.setUpdateable( AbstractCompositeDefinition.this.isUpdateable() )
-											.setInsertGenerated( AbstractCompositeDefinition.this.isInsertGenerated() )
-											.setUpdateGenerated( AbstractCompositeDefinition.this.isUpdateGenerated() )
+											.setInsertable( AbstractCompositionDefinition.this.isInsertable() )
+											.setUpdateable( AbstractCompositionDefinition.this.isUpdateable() )
+											.setInsertGenerated( AbstractCompositionDefinition.this.isInsertGenerated() )
+											.setUpdateGenerated( AbstractCompositionDefinition.this.isUpdateGenerated() )
 											.setNullable( getType().getPropertyNullability()[currentAttributeNumber] )
 											.setDirtyCheckable( true )
-											.setVersionable( AbstractCompositeDefinition.this.isVersionable() )
+											.setVersionable( AbstractCompositionDefinition.this.isVersionable() )
 											.setCascadeStyle( getType().getCascadeStyle( currentAttributeNumber ) )
 											.setFetchMode( getType().getFetchMode( currentAttributeNumber ) )
 											.createInformation(),
-									AbstractCompositeDefinition.this.attributeNumber(),
+									AbstractCompositionDefinition.this.attributeNumber(),
 									associationKey
 							);
 						}
 						else if ( type.isComponentType() ) {
-							return new CompositeBasedCompositeAttribute(
-									AbstractCompositeDefinition.this,
+							return new CompositionBasedCompositionAttribute(
+									AbstractCompositionDefinition.this,
 									sessionFactory(),
 									currentAttributeNumber,
 									name,
 									(CompositeType) type,
 									new BaselineAttributeInformation.Builder()
-											.setInsertable( AbstractCompositeDefinition.this.isInsertable() )
-											.setUpdateable( AbstractCompositeDefinition.this.isUpdateable() )
-											.setInsertGenerated( AbstractCompositeDefinition.this.isInsertGenerated() )
-											.setUpdateGenerated( AbstractCompositeDefinition.this.isUpdateGenerated() )
+											.setInsertable( AbstractCompositionDefinition.this.isInsertable() )
+											.setUpdateable( AbstractCompositionDefinition.this.isUpdateable() )
+											.setInsertGenerated( AbstractCompositionDefinition.this.isInsertGenerated() )
+											.setUpdateGenerated( AbstractCompositionDefinition.this.isUpdateGenerated() )
 											.setNullable( getType().getPropertyNullability()[currentAttributeNumber] )
 											.setDirtyCheckable( true )
-											.setVersionable( AbstractCompositeDefinition.this.isVersionable() )
+											.setVersionable( AbstractCompositionDefinition.this.isVersionable() )
 											.setCascadeStyle( getType().getCascadeStyle( currentAttributeNumber ) )
 											.setFetchMode( getType().getFetchMode( currentAttributeNumber ) )
 											.createInformation()
@@ -161,19 +162,19 @@ public abstract class AbstractCompositeDefinition extends AbstractNonIdentifierA
 						}
 						else {
 							return new CompositeBasedBasicAttribute(
-									AbstractCompositeDefinition.this,
+									AbstractCompositionDefinition.this,
 									sessionFactory(),
 									currentAttributeNumber,
 									name,
 									type,
 									new BaselineAttributeInformation.Builder()
-											.setInsertable( AbstractCompositeDefinition.this.isInsertable() )
-											.setUpdateable( AbstractCompositeDefinition.this.isUpdateable() )
-											.setInsertGenerated( AbstractCompositeDefinition.this.isInsertGenerated() )
-											.setUpdateGenerated( AbstractCompositeDefinition.this.isUpdateGenerated() )
+											.setInsertable( AbstractCompositionDefinition.this.isInsertable() )
+											.setUpdateable( AbstractCompositionDefinition.this.isUpdateable() )
+											.setInsertGenerated( AbstractCompositionDefinition.this.isInsertGenerated() )
+											.setUpdateGenerated( AbstractCompositionDefinition.this.isUpdateGenerated() )
 											.setNullable( getType().getPropertyNullability()[currentAttributeNumber] )
 											.setDirtyCheckable( true )
-											.setVersionable( AbstractCompositeDefinition.this.isVersionable() )
+											.setVersionable( AbstractCompositionDefinition.this.isVersionable() )
 											.setCascadeStyle( getType().getCascadeStyle( currentAttributeNumber ) )
 											.setFetchMode( getType().getFetchMode( currentAttributeNumber ) )
 											.createInformation()
@@ -195,8 +196,13 @@ public abstract class AbstractCompositeDefinition extends AbstractNonIdentifierA
 			return ( (EntityDefinition) getSource() ).getEntityPersister();
 		}
 		else {
-			return ( (AbstractCompositeDefinition) getSource() ).locateOwningPersister();
+			return ( (AbstractCompositionDefinition) getSource() ).locateOwningPersister();
 		}
 	}
+
+	@Override
+	protected String loggableMetadata() {
+		return super.loggableMetadata() + ",composition";
+	}
 }
 

hibernate-core/src/main/java/org/hibernate/tuple/component/CompositeBasedAssociationAttribute.java

@@ -23,6 +23,8 @@
  */
 package org.hibernate.tuple.component;
 
+import java.io.Serializable;
+
 import org.hibernate.FetchMode;
 import org.hibernate.engine.FetchStrategy;
 import org.hibernate.engine.FetchStyle;
@@ -34,6 +36,7 @@ import org.hibernate.loader.PropertyPath;
 import org.hibernate.persister.collection.CollectionPersister;
 import org.hibernate.persister.entity.EntityPersister;
 import org.hibernate.persister.entity.Joinable;
+import org.hibernate.persister.spi.HydratedCompoundValueHandler;
 import org.hibernate.persister.walking.internal.Helper;
 import org.hibernate.persister.walking.spi.AssociationAttributeDefinition;
 import org.hibernate.persister.walking.spi.AssociationKey;
@@ -54,7 +57,7 @@ public class CompositeBasedAssociationAttribute
 	private Joinable joinable;
 
 	public CompositeBasedAssociationAttribute(
-			AbstractCompositeDefinition source,
+			AbstractCompositionDefinition source,
 			SessionFactoryImplementor factory,
 			int attributeNumber,
 			String attributeName,
@@ -154,4 +157,29 @@ public class CompositeBasedAssociationAttribute
 		final CompositeType compositeType = (CompositeType) locateOwningPersister().getPropertyType( getName() );
 		return compositeType.getCascadeStyle( attributeNumber() );
 	}
+
+	private HydratedCompoundValueHandler hydratedCompoundValueHandler;
+
+	@Override
+	public HydratedCompoundValueHandler getHydratedCompoundValueExtractor() {
+		if ( hydratedCompoundValueHandler == null ) {
+			hydratedCompoundValueHandler = new HydratedCompoundValueHandler() {
+				@Override
+				public Object extract(Object hydratedState) {
+					return ( (Object[] ) hydratedState )[ attributeNumber() ];
+				}
+
+				@Override
+				public void inject(Object hydratedState, Object value) {
+					( (Object[] ) hydratedState )[ attributeNumber() ] = value;
+				}
+			};
+		}
+		return hydratedCompoundValueHandler;
+	}
+
+	@Override
+	protected String loggableMetadata() {
+		return super.loggableMetadata() + ",association";
+	}
 }

hibernate-core/src/main/java/org/hibernate/tuple/component/CompositionBasedCompositionAttribute.java

@@ -24,18 +24,18 @@
 package org.hibernate.tuple.component;
 
 import org.hibernate.engine.spi.SessionFactoryImplementor;
-import org.hibernate.persister.walking.spi.CompositeDefinition;
+import org.hibernate.persister.walking.spi.CompositionDefinition;
 import org.hibernate.tuple.BaselineAttributeInformation;
 import org.hibernate.type.CompositeType;
 
 /**
  * @author Steve Ebersole
  */
-public class CompositeBasedCompositeAttribute
-		extends AbstractCompositeDefinition
-		implements CompositeDefinition {
-	public CompositeBasedCompositeAttribute(
-			CompositeDefinition source,
+public class CompositionBasedCompositionAttribute
+		extends AbstractCompositionDefinition
+		implements CompositionDefinition {
+	public CompositionBasedCompositionAttribute(
+			CompositionDefinition source,
 			SessionFactoryImplementor sessionFactory,
 			int attributeNumber,
 			String attributeName,

hibernate-core/src/main/java/org/hibernate/tuple/entity/EntityBasedAssociationAttribute.java

@@ -33,6 +33,7 @@ import org.hibernate.persister.collection.QueryableCollection;
 import org.hibernate.persister.entity.EntityPersister;
 import org.hibernate.persister.entity.Joinable;
 import org.hibernate.persister.entity.OuterJoinLoadable;
+import org.hibernate.persister.spi.HydratedCompoundValueHandler;
 import org.hibernate.persister.walking.internal.Helper;
 import org.hibernate.persister.walking.spi.AssociationAttributeDefinition;
 import org.hibernate.persister.walking.spi.AssociationKey;
@@ -152,4 +153,29 @@ public class EntityBasedAssociationAttribute
 	public CascadeStyle determineCascadeStyle() {
 		return getSource().getEntityPersister().getPropertyCascadeStyles()[attributeNumber()];
 	}
+
+	private HydratedCompoundValueHandler hydratedCompoundValueHandler;
+
+	@Override
+	public HydratedCompoundValueHandler getHydratedCompoundValueExtractor() {
+		if ( hydratedCompoundValueHandler == null ) {
+			hydratedCompoundValueHandler = new HydratedCompoundValueHandler() {
+				@Override
+				public Object extract(Object hydratedState) {
+					return ( (Object[] ) hydratedState )[ attributeNumber() ];
+				}
+
+				@Override
+				public void inject(Object hydratedState, Object value) {
+					( (Object[] ) hydratedState )[ attributeNumber() ] = value;
+				}
+			};
+		}
+		return hydratedCompoundValueHandler;
+	}
+
+	@Override
+	protected String loggableMetadata() {
+		return super.loggableMetadata() + ",association";
+	}
 }

hibernate-core/src/main/java/org/hibernate/tuple/entity/EntityBasedCompositionAttribute.java

@@ -25,19 +25,19 @@ package org.hibernate.tuple.entity;
 
 import org.hibernate.engine.spi.SessionFactoryImplementor;
 import org.hibernate.persister.entity.EntityPersister;
-import org.hibernate.tuple.component.AbstractCompositeDefinition;
-import org.hibernate.persister.walking.spi.CompositeDefinition;
+import org.hibernate.tuple.component.AbstractCompositionDefinition;
+import org.hibernate.persister.walking.spi.CompositionDefinition;
 import org.hibernate.tuple.BaselineAttributeInformation;
 import org.hibernate.type.CompositeType;
 
 /**
  * @author Steve Ebersole
  */
-public class EntityBasedCompositeAttribute
-		extends AbstractCompositeDefinition
-		implements CompositeDefinition {
+public class EntityBasedCompositionAttribute
+		extends AbstractCompositionDefinition
+		implements CompositionDefinition {
 
-	public EntityBasedCompositeAttribute(
+	public EntityBasedCompositionAttribute(
 			EntityPersister source,
 			SessionFactoryImplementor factory,
 			int attributeNumber,

hibernate-core/src/test/java/org/hibernate/loader/plan/spi/LoadPlanBuilderTest.java

@@ -119,9 +119,9 @@ public class LoadPlanBuilderTest extends BaseCoreFunctionalTestCase {
 		CollectionReturn collectionReturn = ExtraAssertions.assertTyping( CollectionReturn.class, rtn );
 		assertEquals( "abc", collectionReturn.getAlias() );
 
-		assertNotNull( collectionReturn.getFetches() );
-		assertEquals( 1, collectionReturn.getFetches().length ); // the collection elements are fetched
-		Fetch fetch = collectionReturn.getFetches()[0];
+		assertNotNull( collectionReturn.getElementGraph().getFetches() );
+		assertEquals( 1, collectionReturn.getElementGraph().getFetches().length ); // the collection elements are fetched
+		Fetch fetch = collectionReturn.getElementGraph().getFetches()[0];
 		EntityFetch entityFetch = ExtraAssertions.assertTyping( EntityFetch.class, fetch );
 		assertNotNull( entityFetch.getFetches() );
 		assertEquals( 0, entityFetch.getFetches().length );
@@ -130,8 +130,8 @@ public class LoadPlanBuilderTest extends BaseCoreFunctionalTestCase {
 	@Entity( name = "Message" )
 	public static class Message {
 		@Id
-		private Integer id;
-		private String name;
+		private Integer mid;
+		private String msgTxt;
 		@ManyToOne( cascade = CascadeType.MERGE )
 		@JoinColumn
 		private Poster poster;
@@ -140,7 +140,7 @@ public class LoadPlanBuilderTest extends BaseCoreFunctionalTestCase {
 	@Entity( name = "Poster" )
 	public static class Poster {
 		@Id
-		private Integer id;
+		private Integer pid;
 		private String name;
 		@OneToMany(mappedBy = "poster")
 		private List<Message> messages;

hibernate-core/src/test/java/org/hibernate/persister/walking/BasicWalkingTest.java

@@ -35,8 +35,11 @@ import org.hibernate.persister.entity.EntityPersister;
 import org.hibernate.persister.walking.spi.AssociationVisitationStrategy;
 import org.hibernate.persister.walking.spi.AttributeDefinition;
 import org.hibernate.persister.walking.spi.CollectionDefinition;
-import org.hibernate.persister.walking.spi.CompositeDefinition;
+import org.hibernate.persister.walking.spi.CollectionElementDefinition;
+import org.hibernate.persister.walking.spi.CollectionIndexDefinition;
+import org.hibernate.persister.walking.spi.CompositionDefinition;
 import org.hibernate.persister.walking.spi.EntityDefinition;
+import org.hibernate.persister.walking.spi.EntityIdentifierDefinition;
 import org.hibernate.persister.walking.spi.MetadataDrivenModelGraphVisitor;
 
 import org.junit.Test;
@@ -91,6 +94,16 @@ public class BasicWalkingTest extends BaseCoreFunctionalTestCase {
 						);
 					}
 
+					@Override
+					public void startingEntityIdentifier(EntityIdentifierDefinition entityIdentifierDefinition) {
+						//To change body of implemented methods use File | Settings | File Templates.
+					}
+
+					@Override
+					public void finishingEntityIdentifier(EntityIdentifierDefinition entityIdentifierDefinition) {
+						//To change body of implemented methods use File | Settings | File Templates.
+					}
+
 					@Override
 					public void startingCollection(CollectionDefinition collectionDefinition) {
 						System.out.println(
@@ -114,23 +127,43 @@ public class BasicWalkingTest extends BaseCoreFunctionalTestCase {
 					}
 
 					@Override
-					public void startingComposite(CompositeDefinition compositeDefinition) {
+					public void startingCollectionIndex(CollectionIndexDefinition collectionIndexDefinition) {
+						//To change body of implemented methods use File | Settings | File Templates.
+					}
+
+					@Override
+					public void finishingCollectionIndex(CollectionIndexDefinition collectionIndexDefinition) {
+						//To change body of implemented methods use File | Settings | File Templates.
+					}
+
+					@Override
+					public void startingCollectionElements(CollectionElementDefinition elementDefinition) {
+						//To change body of implemented methods use File | Settings | File Templates.
+					}
+
+					@Override
+					public void finishingCollectionElements(CollectionElementDefinition elementDefinition) {
+						//To change body of implemented methods use File | Settings | File Templates.
+					}
+
+					@Override
+					public void startingComposite(CompositionDefinition compositionDefinition) {
 						System.out.println(
 								String.format(
 										"%s Starting composite (%s)",
 										StringHelper.repeat( ">>", ++depth ),
-										compositeDefinition.toString()
+										compositionDefinition.toString()
 								)
 						);
 					}
 
 					@Override
-					public void finishingComposite(CompositeDefinition compositeDefinition) {
+					public void finishingComposite(CompositionDefinition compositionDefinition) {
 						System.out.println(
 								String.format(
 										"%s Finishing composite (%s)",
 										StringHelper.repeat( ">>", depth-- ),
-										compositeDefinition.toString()
+										compositionDefinition.toString()
 								)
 						);
 					}

hibernate-core/src/test/java/org/hibernate/test/cfg/persister/GoofyPersisterClassProvider.java

@@ -58,6 +58,7 @@ import org.hibernate.persister.spi.PersisterClassResolver;
 import org.hibernate.persister.walking.spi.AttributeDefinition;
 import org.hibernate.persister.walking.spi.CollectionElementDefinition;
 import org.hibernate.persister.walking.spi.CollectionIndexDefinition;
+import org.hibernate.persister.walking.spi.EntityIdentifierDefinition;
 import org.hibernate.tuple.entity.EntityMetamodel;
 import org.hibernate.tuple.entity.EntityTuplizer;
 import org.hibernate.tuple.entity.NonPojoInstrumentationMetadata;
@@ -590,8 +591,8 @@ public class GoofyPersisterClassProvider implements PersisterClassResolver {
 		}
 
 		@Override
-		public Iterable<AttributeDefinition> getEmbeddedCompositeIdentifierAttributes() {
-			throw new NotYetImplementedException();
+		public EntityIdentifierDefinition getEntityKeyDefinition() {
+			return null;  //To change body of implemented methods use File | Settings | File Templates.
 		}
 
 		@Override

hibernate-core/src/test/java/org/hibernate/test/legacy/CustomPersister.java

@@ -36,6 +36,7 @@ import org.hibernate.mapping.PersistentClass;
 import org.hibernate.metadata.ClassMetadata;
 import org.hibernate.persister.entity.EntityPersister;
 import org.hibernate.persister.walking.spi.AttributeDefinition;
+import org.hibernate.persister.walking.spi.EntityIdentifierDefinition;
 import org.hibernate.tuple.entity.EntityMetamodel;
 import org.hibernate.tuple.entity.EntityTuplizer;
 import org.hibernate.tuple.entity.NonPojoInstrumentationMetadata;
@@ -680,7 +681,7 @@ public class CustomPersister implements EntityPersister {
 	}
 
 	@Override
-	public Iterable<AttributeDefinition> getEmbeddedCompositeIdentifierAttributes() {
+	public EntityIdentifierDefinition getEntityKeyDefinition() {
 		throw new NotYetImplementedException();
 	}
 

hibernate-core/src/test/resources/log4j.properties

@@ -9,6 +9,8 @@ log4j.rootLogger=info, stdout
 log4j.logger.org.hibernate.tool.hbm2ddl=trace
 log4j.logger.org.hibernate.testing.cache=debug
 
+log4j.logger.org.hibernate.loader.plan=trace
+
 # SQL Logging - HHH-6833
 log4j.logger.org.hibernate.SQL=debug