HHH-15133 - Use specified result-type to better infer "shape" of query results with implicit selections

documentation/src/test/java/org/hibernate/userguide/hql/HQLTest.java

@@ -2447,7 +2447,7 @@ public class HQLTest extends BaseEntityManagerFunctionalTestCase {
 				Object[].class)
 			.getResultList();
 			//end::hql-relational-comparisons-example[]
-			assertEquals(2, phonePayments.size());
+			assertEquals(3, phonePayments.size());
 		});
 	}
 

hibernate-core/src/main/java/org/hibernate/jpa/spi/NativeQueryTupleTransformer.java

@@ -14,6 +14,7 @@ import jakarta.persistence.Tuple;
 import jakarta.persistence.TupleElement;
 
 import org.hibernate.HibernateException;
+import org.hibernate.query.TypedTupleTransformer;
 import org.hibernate.transform.ResultTransformer;
 
 /**
@@ -21,13 +22,18 @@ import org.hibernate.transform.ResultTransformer;
  *
  * @author Arnold Galovics
  */
-public class NativeQueryTupleTransformer implements ResultTransformer<Tuple> {
+public class NativeQueryTupleTransformer implements ResultTransformer<Tuple>, TypedTupleTransformer<Tuple> {
 
 	@Override
 	public Tuple transformTuple(Object[] tuple, String[] aliases) {
 		return new NativeTupleImpl( tuple, aliases );
 	}
 
+	@Override
+	public Class<Tuple> getTransformedType() {
+		return Tuple.class;
+	}
+
 	private static class NativeTupleElementImpl<X> implements TupleElement<X> {
 
 		private final Class<? extends X> javaType;

hibernate-core/src/main/java/org/hibernate/loader/ast/internal/LoaderSqlAstCreationState.java

@@ -211,6 +211,11 @@ public class LoaderSqlAstCreationState
 		return null;
 	}
 
+	@Override
+	public Boolean isDeDuplicationEnabled() {
+		return false;
+	}
+
 	@Override
 	public Boolean isResultCachingEnabled() {
 		return false;

hibernate-core/src/main/java/org/hibernate/query/TypedTupleTransformer.java

@@ -0,0 +1,22 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.query;
+
+/**
+ * Extension to TupleTransformer exposing the transformation target type.
+ *
+ * @apiNote This is mainly intended for use in equality checking while applying
+ * result de-duplication for queries.
+ *
+ * @author Steve Ebersole
+ */
+public interface TypedTupleTransformer<T> extends TupleTransformer<T> {
+	/**
+	 * The type resulting from this transformation
+	 */
+	Class<T> getTransformedType();
+}

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

@@ -17,9 +17,9 @@ import org.hibernate.LockOptions;
 import org.hibernate.graph.GraphSemantic;
 import org.hibernate.graph.spi.AppliedGraph;
 import org.hibernate.graph.spi.RootGraphImplementor;
-import org.hibernate.query.spi.Limit;
 import org.hibernate.query.ResultListTransformer;
 import org.hibernate.query.TupleTransformer;
+import org.hibernate.query.spi.Limit;
 import org.hibernate.query.spi.MutableQueryOptions;
 
 /**
@@ -43,6 +43,7 @@ public class QueryOptionsImpl implements MutableQueryOptions, AppliedGraph {
 
 	private TupleTransformer tupleTransformer;
 	private ResultListTransformer resultListTransformer;
+	private Boolean deDupEnabled;
 
 	private RootGraphImplementor<?> rootGraph;
 	private GraphSemantic graphSemantic;
@@ -160,6 +161,15 @@ public class QueryOptionsImpl implements MutableQueryOptions, AppliedGraph {
 		return resultListTransformer;
 	}
 
+	@Override
+	public Boolean isDeDuplicationEnabled() {
+		return deDupEnabled;
+	}
+
+	public void setDeDuplicationEnabled(boolean enabled) {
+		this.deDupEnabled = enabled;
+	}
+
 	public void setResultCacheRegionName(String resultCacheRegionName) {
 		this.resultCacheRegionName = resultCacheRegionName;
 	}

hibernate-core/src/main/java/org/hibernate/query/spi/DelegatingQueryOptions.java

@@ -58,6 +58,11 @@ public class DelegatingQueryOptions implements QueryOptions {
 		return queryOptions.getResultListTransformer();
 	}
 
+	@Override
+	public Boolean isDeDuplicationEnabled() {
+		return queryOptions.isDeDuplicationEnabled();
+	}
+
 	@Override
 	public Boolean isResultCachingEnabled() {
 		return queryOptions.isResultCachingEnabled();

hibernate-core/src/main/java/org/hibernate/query/spi/QueryOptions.java

@@ -62,6 +62,13 @@ public interface QueryOptions {
 	 */
 	ResultListTransformer<?> getResultListTransformer();
 
+	Boolean isDeDuplicationEnabled();
+
+	default boolean shouldApplyDeDuplication() {
+		final Boolean setting = isDeDuplicationEnabled();
+		return setting != null && setting;
+	}
+
 	/**
 	 * Should results from the query be cached?
 	 *

hibernate-core/src/main/java/org/hibernate/query/spi/QueryOptionsAdapter.java

@@ -80,6 +80,11 @@ public abstract class QueryOptionsAdapter implements QueryOptions {
 		return null;
 	}
 
+	@Override
+	public Boolean isDeDuplicationEnabled() {
+		return null;
+	}
+
 	@Override
 	public String getResultCacheRegionName() {
 		return null;

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

@@ -105,7 +105,7 @@ public class NativeSelectQueryPlanImpl<R> implements NativeSelectQueryPlan<R> {
 				jdbcParameterBindings,
 				SqmJdbcExecutionContextAdapter.usingLockingAndPaging( executionContext ),
 				null,
-				ListResultsConsumer.UniqueSemantic.NONE
+				ListResultsConsumer.UniqueSemantic.NEVER
 		);
 	}
 

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

@@ -122,7 +122,9 @@ public class ConcreteSqmSelectQueryPlan<R> implements SelectQueryPlan<R> {
 							}
 						},
 						rowTransformer,
-						ListResultsConsumer.UniqueSemantic.FILTER
+						queryOptions.shouldApplyDeDuplication()
+								? ListResultsConsumer.UniqueSemantic.FILTER
+								: ListResultsConsumer.UniqueSemantic.NONE
 				);
 			}
 			finally {
@@ -205,13 +207,7 @@ public class ConcreteSqmSelectQueryPlan<R> implements SelectQueryPlan<R> {
 
 		// NOTE : if we get here we have a resultType of some kind
 
-		if ( queryOptions.getTupleTransformer() != null ) {
+		if ( selections.size() > 1 ) {
-			// aside from checking the type parameters for the given TupleTransformer
-			// there is not a decent way to verify that the TupleTransformer returns
-			// the same type.  We rely on the API here and assume the best
-			return makeRowTransformerTupleTransformerAdapter( sqm, queryOptions );
-		}
-		else if ( selections.size() > 1 ) {
 			throw new IllegalQueryOperationException( "Query defined multiple selections, return cannot be typed (other that Object[] or Tuple)" );
 		}
 		else {

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

@@ -230,6 +230,7 @@ public class OutputsImpl implements Outputs {
 				executionContext,
 				null,
 				RowTransformerStandardImpl.INSTANCE,
+				null,
 				jdbcValues
 		);
 

hibernate-core/src/main/java/org/hibernate/sql/exec/internal/JdbcSelectExecutorStandardImpl.java

@@ -68,16 +68,12 @@ import org.hibernate.type.BasicType;
 import org.hibernate.type.descriptor.java.JavaType;
 
 /**
+ * Standard JdbcSelectExecutor implementation used by Hibernate,
+ * through {@link JdbcSelectExecutorStandardImpl#INSTANCE}
+ *
  * @author Steve Ebersole
  */
 public class JdbcSelectExecutorStandardImpl implements JdbcSelectExecutor {
-	// todo (6.0) : Make resolving these executors swappable - JdbcServices?
-	//		Since JdbcServices is just a "composition service", this is actually
-	//		a very good option...
-
-	// todo (6.0) : where do affected-table-names get checked for up-to-date?
-	//		who is responsible for that?  Here?
-
 	/**
 	 * Singleton access
 	 */
@@ -89,6 +85,7 @@ public class JdbcSelectExecutorStandardImpl implements JdbcSelectExecutor {
 			JdbcParameterBindings jdbcParameterBindings,
 			ExecutionContext executionContext,
 			RowTransformer<R> rowTransformer,
+			Class<R> domainResultType,
 			ListResultsConsumer.UniqueSemantic uniqueSemantic) {
 		// Only do auto flushing for top level queries
 		return executeQuery(
@@ -96,6 +93,7 @@ public class JdbcSelectExecutorStandardImpl implements JdbcSelectExecutor {
 				jdbcParameterBindings,
 				executionContext,
 				rowTransformer,
+				domainResultType,
 				(sql) -> executionContext.getSession()
 						.getJdbcCoordinator()
 						.getStatementPreparer()
@@ -118,6 +116,7 @@ public class JdbcSelectExecutorStandardImpl implements JdbcSelectExecutor {
 				jdbcParameterBindings,
 				executionContext,
 				rowTransformer,
+				null,
 				(sql) -> executionContext.getSession().getJdbcCoordinator().getStatementPreparer().prepareQueryStatement(
 						sql,
 						false,
@@ -152,6 +151,7 @@ public class JdbcSelectExecutorStandardImpl implements JdbcSelectExecutor {
 			JdbcParameterBindings jdbcParameterBindings,
 			ExecutionContext executionContext,
 			RowTransformer<R> rowTransformer,
+			Class<R> domainResultType,
 			Function<String, PreparedStatement> statementCreator,
 			ResultsConsumer<T, R> resultsConsumer) {
 		final PersistenceContext persistenceContext = executionContext.getSession().getPersistenceContext();
@@ -168,6 +168,7 @@ public class JdbcSelectExecutorStandardImpl implements JdbcSelectExecutor {
 					jdbcParameterBindings,
 					executionContext,
 					rowTransformer,
+					domainResultType,
 					statementCreator,
 					resultsConsumer
 			);
@@ -184,6 +185,7 @@ public class JdbcSelectExecutorStandardImpl implements JdbcSelectExecutor {
 			JdbcParameterBindings jdbcParameterBindings,
 			ExecutionContext executionContext,
 			RowTransformer<R> rowTransformer,
+			Class<R> domainResultType,
 			Function<String, PreparedStatement> statementCreator,
 			ResultsConsumer<T, R> resultsConsumer) {
 		return doExecuteQuery(
@@ -191,6 +193,7 @@ public class JdbcSelectExecutorStandardImpl implements JdbcSelectExecutor {
 				jdbcParameterBindings,
 				getScrollContext( executionContext, executionContext.getSession().getPersistenceContext() ),
 				rowTransformer,
+				domainResultType,
 				statementCreator,
 				resultsConsumer
 		);
@@ -214,6 +217,7 @@ public class JdbcSelectExecutorStandardImpl implements JdbcSelectExecutor {
 		final AppliedGraph appliedGraph = queryOptions.getAppliedGraph();
 		final TupleTransformer<?> tupleTransformer = queryOptions.getTupleTransformer();
 		final ResultListTransformer<?> resultListTransformer = queryOptions.getResultListTransformer();
+		final Boolean deDuplicationEnabled = queryOptions.isDeDuplicationEnabled();
 		final Boolean resultCachingEnabled = queryOptions.isResultCachingEnabled();
 		final CacheRetrieveMode cacheRetrieveMode = queryOptions.getCacheRetrieveMode();
 		final CacheStoreMode cacheStoreMode = queryOptions.getCacheStoreMode();
@@ -259,6 +263,11 @@ public class JdbcSelectExecutorStandardImpl implements JdbcSelectExecutor {
 						return resultListTransformer;
 					}
 
+					@Override
+					public Boolean isDeDuplicationEnabled() {
+						return deDuplicationEnabled;
+					}
+
 					@Override
 					public Boolean isResultCachingEnabled() {
 						return resultCachingEnabled;
@@ -322,11 +331,13 @@ public class JdbcSelectExecutorStandardImpl implements JdbcSelectExecutor {
 			}
 		};
 	}
+
 	private <T, R> T doExecuteQuery(
 			JdbcSelect jdbcSelect,
 			JdbcParameterBindings jdbcParameterBindings,
 			ExecutionContext executionContext,
 			RowTransformer<R> rowTransformer,
+			Class<R> domainResultType,
 			Function<String, PreparedStatement> statementCreator,
 			ResultsConsumer<T, R> resultsConsumer) {
 
@@ -346,7 +357,10 @@ public class JdbcSelectExecutorStandardImpl implements JdbcSelectExecutor {
 
 		if ( rowTransformer == null ) {
 			@SuppressWarnings("unchecked")
-			final TupleTransformer<R> tupleTransformer = (TupleTransformer<R>) executionContext.getQueryOptions().getTupleTransformer();
+			final TupleTransformer<R> tupleTransformer = (TupleTransformer<R>) executionContext
+					.getQueryOptions()
+					.getTupleTransformer();
+
 			if ( tupleTransformer == null ) {
 				rowTransformer = RowTransformerStandardImpl.instance();
 			}
@@ -415,6 +429,7 @@ public class JdbcSelectExecutorStandardImpl implements JdbcSelectExecutor {
 						? LockOptions.NONE
 						: executionContext.getQueryOptions().getLockOptions(),
 				rowTransformer,
+				domainResultType,
 				jdbcValues
 		);
 

hibernate-core/src/main/java/org/hibernate/sql/exec/spi/JdbcSelectExecutor.java

@@ -22,11 +22,21 @@ import org.hibernate.sql.results.spi.RowTransformer;
  */
 @Incubating
 public interface JdbcSelectExecutor {
+	default <R> List<R> list(
+			JdbcSelect jdbcSelect,
+			JdbcParameterBindings jdbcParameterBindings,
+			ExecutionContext executionContext,
+			RowTransformer<R> rowTransformer,
+			ListResultsConsumer.UniqueSemantic uniqueSemantic) {
+		return list( jdbcSelect, jdbcParameterBindings, executionContext, rowTransformer, null, uniqueSemantic );
+	}
+
 	<R> List<R> list(
 			JdbcSelect jdbcSelect,
 			JdbcParameterBindings jdbcParameterBindings,
 			ExecutionContext executionContext,
 			RowTransformer<R> rowTransformer,
+			Class<R> requestedJavaType,
 			ListResultsConsumer.UniqueSemantic uniqueSemantic);
 
 	<R> ScrollableResultsImplementor<R> scroll(

hibernate-core/src/main/java/org/hibernate/sql/results/internal/ResultsHelper.java

@@ -57,10 +57,12 @@ public class ResultsHelper {
 			ExecutionContext executionContext,
 			LockOptions lockOptions,
 			RowTransformer<R> rowTransformer,
+			Class<R> transformedResultJavaType,
 			JdbcValues jdbcValues) {
+		final SessionFactoryImplementor sessionFactory = executionContext.getSession().getFactory();
+
 		final Map<NavigablePath, Initializer> initializerMap = new LinkedHashMap<>();
 		final List<Initializer> initializers = new ArrayList<>();
-		final SessionFactoryImplementor sessionFactory = executionContext.getSession().getFactory();
 
 		final List<DomainResultAssembler<?>> assemblers = jdbcValues.getValuesMapping().resolveAssemblers(
 				new AssemblerCreationState() {
@@ -107,7 +109,7 @@ public class ResultsHelper {
 
 		logInitializers( initializerMap );
 
-		return new StandardRowReader<>( assemblers, initializers, rowTransformer );
+		return new StandardRowReader<>( assemblers, initializers, rowTransformer, transformedResultJavaType );
 	}
 
 	private static void logInitializers(Map<NavigablePath, Initializer> initializerMap) {

hibernate-core/src/main/java/org/hibernate/sql/results/internal/StandardRowReader.java

@@ -32,18 +32,21 @@ public class StandardRowReader<T> implements RowReader<T> {
 	private final List<DomainResultAssembler<?>> resultAssemblers;
 	private final List<Initializer> initializers;
 	private final RowTransformer<T> rowTransformer;
+	private final Class<T> domainResultJavaType;
 
 	private final int assemblerCount;
 
 	public StandardRowReader(
 			List<DomainResultAssembler<?>> resultAssemblers,
 			List<Initializer> initializers,
-			RowTransformer<T> rowTransformer) {
+			RowTransformer<T> rowTransformer,
+			Class<T> domainResultJavaType) {
 		this.resultAssemblers = resultAssemblers;
 		this.initializers = initializers;
 		this.rowTransformer = rowTransformer;
 
 		this.assemblerCount = resultAssemblers.size();
+		this.domainResultJavaType = domainResultJavaType;
 
 		logDebugInfo();
 	}
@@ -61,18 +64,22 @@ public class StandardRowReader<T> implements RowReader<T> {
 	}
 
 	@Override
-	@SuppressWarnings("unchecked")
+	public Class<T> getDomainResultResultJavaType() {
-	public Class<T> getResultJavaType() {
+		return domainResultJavaType;
-		if ( resultAssemblers.size() == 1 ) {
-			return (Class<T>) resultAssemblers.get( 0 ).getAssembledJavaType().getJavaTypeClass();
-		}
-
-		return (Class<T>) Object[].class;
 	}
 
 	@Override
-	public List<JavaType> getResultJavaTypes() {
+	public Class<?> getResultJavaType() {
-		List<JavaType> javaTypes = new ArrayList<>( resultAssemblers.size() );
+		if ( resultAssemblers.size() == 1 ) {
+			return resultAssemblers.get( 0 ).getAssembledJavaType().getJavaTypeClass();
+		}
+
+		return Object[].class;
+	}
+
+	@Override
+	public List<JavaType<?>> getResultJavaTypes() {
+		List<JavaType<?>> javaTypes = new ArrayList<>( resultAssemblers.size() );
 		for ( DomainResultAssembler resultAssembler : resultAssemblers ) {
 			javaTypes.add( resultAssembler.getAssembledJavaType() );
 		}

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

@@ -8,50 +8,94 @@ package org.hibernate.sql.results.spi;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Locale;
 
 import org.hibernate.HibernateException;
 import org.hibernate.engine.spi.PersistenceContext;
 import org.hibernate.engine.spi.SharedSessionContractImplementor;
 import org.hibernate.query.ResultListTransformer;
+import org.hibernate.query.TupleTransformer;
+import org.hibernate.query.TypedTupleTransformer;
+import org.hibernate.query.spi.QueryOptions;
+import org.hibernate.sql.results.internal.RowProcessingStateStandardImpl;
+import org.hibernate.sql.results.jdbc.internal.JdbcValuesSourceProcessingStateStandardImpl;
 import org.hibernate.sql.results.jdbc.spi.JdbcValues;
 import org.hibernate.sql.results.jdbc.spi.JdbcValuesSourceProcessingOptions;
-import org.hibernate.persister.entity.EntityPersister;
-import org.hibernate.sql.results.jdbc.internal.JdbcValuesSourceProcessingStateStandardImpl;
-import org.hibernate.sql.results.internal.RowProcessingStateStandardImpl;
 import org.hibernate.type.descriptor.java.JavaType;
+import org.hibernate.type.descriptor.java.spi.EntityJavaType;
+import org.hibernate.type.descriptor.java.spi.JavaTypeRegistry;
+import org.hibernate.type.spi.TypeConfiguration;
 
 /**
+ * ResultsConsumer for creating a List of results
+ *
  * @author Steve Ebersole
  */
 public class ListResultsConsumer<R> implements ResultsConsumer<List<R>, R> {
-	/**
+	private static final ListResultsConsumer<?> NEVER_DE_DUP_CONSUMER = new ListResultsConsumer<>( UniqueSemantic.NEVER );
-	 * Singleton access
+	private static final ListResultsConsumer<?> IGNORE_DUP_CONSUMER = new ListResultsConsumer<>( UniqueSemantic.NONE );
-	 */
+	private static final ListResultsConsumer<?> DE_DUP_CONSUMER = new ListResultsConsumer<>( UniqueSemantic.FILTER );
-	private static final ListResultsConsumer UNIQUE_FILTER_INSTANCE = new ListResultsConsumer( UniqueSemantic.FILTER );
+	private static final ListResultsConsumer<?> ERROR_DUP_CONSUMER = new ListResultsConsumer<>( UniqueSemantic.ASSERT );
-	private static final ListResultsConsumer NORMAL_INSTANCE = new ListResultsConsumer( UniqueSemantic.NONE );
-	private static final ListResultsConsumer UNIQUE_INSTANCE = new ListResultsConsumer( UniqueSemantic.ASSERT );
 
+	@SuppressWarnings("unchecked")
 	public static <R> ListResultsConsumer<R> instance(UniqueSemantic uniqueSemantic) {
 		switch ( uniqueSemantic ) {
-			case ASSERT:
+			case ASSERT: {
-				return UNIQUE_INSTANCE;
+				return (ListResultsConsumer<R>) ERROR_DUP_CONSUMER;
-			case FILTER:
+			}
-				return UNIQUE_FILTER_INSTANCE;
+			case FILTER: {
-			default:
+				return (ListResultsConsumer<R>) DE_DUP_CONSUMER;
-				return NORMAL_INSTANCE;
+			}
+			case NEVER: {
+				return (ListResultsConsumer<R>) NEVER_DE_DUP_CONSUMER;
+			}
+			default: {
+				return (ListResultsConsumer<R>) IGNORE_DUP_CONSUMER;
+			}
 		}
 	}
 
+	/**
+	 * Ways this consumer can handle in-memory row de-duplication
+	 */
 	public enum UniqueSemantic {
+		/**
+		 * Apply no in-memory de-duplication
+		 */
 		NONE,
+
+		/**
+		 * Apply in-memory de-duplication, removing rows already part of the results
+		 */
 		FILTER,
-		ASSERT;
+
+		/**
+		 * Apply in-memory duplication checks, throwing a HibernateException when duplicates are found
+		 */
+		ASSERT,
+
+		/**
+		 * Never apply unique handling.  E.g. for NativeQuery.  Whereas {@link #NONE} can be adjusted,
+		 * NEVER will never apply unique handling
+		 */
+		NEVER
 	}
 
 	private final UniqueSemantic uniqueSemantic;
+	private final ResultHandler<R> resultHandler;
 
 	public ListResultsConsumer(UniqueSemantic uniqueSemantic) {
 		this.uniqueSemantic = uniqueSemantic;
+
+		if ( uniqueSemantic == UniqueSemantic.FILTER ) {
+			resultHandler = ListResultsConsumer::deDuplicationHandling;
+		}
+		else if ( uniqueSemantic == UniqueSemantic.ASSERT ) {
+			resultHandler = ListResultsConsumer::duplicationErrorHandling;
+		}
+		else {
+			resultHandler = ListResultsConsumer::applyAll;
+		}
 	}
 
 	@Override
@@ -63,61 +107,75 @@ public class ListResultsConsumer<R> implements ResultsConsumer<List<R>, R> {
 			RowProcessingStateStandardImpl rowProcessingState,
 			RowReader<R> rowReader) {
 		final PersistenceContext persistenceContext = session.getPersistenceContext();
+		final TypeConfiguration typeConfiguration = session.getTypeConfiguration();
+		final JavaTypeRegistry javaTypeRegistry = typeConfiguration.getJavaTypeRegistry();
+		final QueryOptions queryOptions = rowProcessingState.getQueryOptions();
+
 		RuntimeException ex = null;
 		try {
 			persistenceContext.getLoadContexts().register( jdbcValuesSourceProcessingState );
 
 			final List<R> results = new ArrayList<>();
 
-			boolean uniqueRows = false;
+			final JavaType<R> domainResultJavaType;
+			final ResultHandler<R> resultHandlerToUse;
 
-			if ( uniqueSemantic != UniqueSemantic.NONE ) {
+			final TupleTransformer<?> tupleTransformer = queryOptions.getTupleTransformer();
-				final Class<R> resultJavaType = rowReader.getResultJavaType();
+			if ( tupleTransformer instanceof TypedTupleTransformer ) {
-				if ( resultJavaType != null && !resultJavaType.isArray() ) {
+				//noinspection unchecked
-					final EntityPersister entityDescriptor = session.getFactory()
+				final TypedTupleTransformer<R> typedTupleTransformer = (TypedTupleTransformer<R>) tupleTransformer;
-							.getRuntimeMetamodels()
+				domainResultJavaType = javaTypeRegistry.resolveDescriptor( typedTupleTransformer.getTransformedType() );
-							.getMappingMetamodel()
+
-							.findEntityDescriptor( resultJavaType );
+				if ( uniqueSemantic == UniqueSemantic.NEVER ) {
-					if ( entityDescriptor != null ) {
+					resultHandlerToUse = this.resultHandler;
-						uniqueRows = true;
-					}
 				}
-			}
+				else if ( queryOptions.shouldApplyDeDuplication() ) {
-
+					resultHandlerToUse = ListResultsConsumer::deDuplicationHandling;
-			if ( uniqueRows ) {
+				}
-				final List<JavaType> resultJavaTypes = rowReader.getResultJavaTypes();
+				else if ( domainResultJavaType instanceof EntityJavaType ) {
-				assert resultJavaTypes.size() == 1;
+					resultHandlerToUse = ListResultsConsumer::deDuplicationHandling;
-				final JavaType<R> resultJavaType = resultJavaTypes.get( 0 );
+				}
-				while ( rowProcessingState.next() ) {
+				else {
-					final R row = rowReader.readRow( rowProcessingState, processingOptions );
+					resultHandlerToUse = this.resultHandler;
-					boolean add = true;
-					for ( R existingRow : results ) {
-						if ( resultJavaType.areEqual( existingRow, row ) ) {
-							if ( uniqueSemantic == UniqueSemantic.ASSERT && !rowProcessingState.hasCollectionInitializers() ) {
-								throw new HibernateException(
-										"More than one row with the given identifier was found: " +
-												jdbcValuesSourceProcessingState.getExecutionContext()
-														.getEntityId() +
-												", for class: " +
-												rowReader.getResultJavaType().getName()
-								);
-							}
-							add = false;
-							break;
-						}
-					}
-					if ( add ) {
-						results.add( row );
-					}
-					rowProcessingState.finishRowProcessing();
 				}
 			}
 			else {
-				while ( rowProcessingState.next() ) {
+				domainResultJavaType = resolveDomainResultJavaType(
-					results.add( rowReader.readRow( rowProcessingState, processingOptions ) );
+						rowReader.getDomainResultResultJavaType(),
-					rowProcessingState.finishRowProcessing();
+						rowReader.getResultJavaTypes(),
+						typeConfiguration
+				);
+
+				if ( uniqueSemantic == UniqueSemantic.NEVER ) {
+					resultHandlerToUse = this.resultHandler;
+				}
+				else if ( queryOptions.shouldApplyDeDuplication() ) {
+					resultHandlerToUse = ListResultsConsumer::deDuplicationHandling;
+				}
+				else {
+					if ( uniqueSemantic == UniqueSemantic.ASSERT ) {
+						if ( rowProcessingState.hasCollectionInitializers ) {
+							resultHandlerToUse = ListResultsConsumer::deDuplicationHandling;
+						}
+						else {
+							resultHandlerToUse = this.resultHandler;
+						}
+					}
+					else if ( domainResultJavaType instanceof EntityJavaType ) {
+						resultHandlerToUse = ListResultsConsumer::deDuplicationHandling;
+					}
+					else {
+						resultHandlerToUse = this.resultHandler;
+					}
 				}
 			}
+
+			while ( rowProcessingState.next() ) {
+				final R row = rowReader.readRow( rowProcessingState, processingOptions );
+				resultHandlerToUse.handle( row, domainResultJavaType, results, rowProcessingState );
+				rowProcessingState.finishRowProcessing();
+			}
+
 			try {
 				jdbcValuesSourceProcessingState.finishUp();
 			}
@@ -126,12 +184,11 @@ public class ListResultsConsumer<R> implements ResultsConsumer<List<R>, R> {
 			}
 
 			//noinspection unchecked
-			final ResultListTransformer<R> resultListTransformer = (ResultListTransformer<R>) jdbcValuesSourceProcessingState.getExecutionContext()
+			final ResultListTransformer<R> resultListTransformer = (ResultListTransformer<R>) queryOptions.getResultListTransformer();
-					.getQueryOptions()
-					.getResultListTransformer();
 			if ( resultListTransformer != null ) {
 				return resultListTransformer.transformList( results );
 			}
+
 			return results;
 		}
 		catch (RuntimeException e) {
@@ -160,8 +217,108 @@ public class ListResultsConsumer<R> implements ResultsConsumer<List<R>, R> {
 		throw new IllegalStateException( "Should not reach this!" );
 	}
 
+	/**
+	 * Essentially a tri-consumer for applying the different duplication strategies.
+	 *
+	 * @see UniqueSemantic
+	 */
+	@FunctionalInterface
+	private interface ResultHandler<R> {
+		void handle(R result, JavaType<R> transformedJavaType, List<R> results, RowProcessingStateStandardImpl rowProcessingState);
+	}
+
+	public static <R> void deDuplicationHandling(
+			R result,
+			JavaType<R> transformedJavaType,
+			List<R> results,
+			RowProcessingStateStandardImpl rowProcessingState) {
+		withDuplicationCheck(
+				result,
+				transformedJavaType,
+				results,
+				rowProcessingState,
+				false
+		);
+	}
+
+	private static <R> void withDuplicationCheck(
+			R result,
+			JavaType<R> transformedJavaType,
+			List<R> results,
+			RowProcessingStateStandardImpl rowProcessingState,
+			boolean throwException) {
+		boolean addResult = true;
+
+		for ( int i = 0; i < results.size(); i++ ) {
+			final R existingResult = results.get( i );
+			if ( transformedJavaType.areEqual( result, existingResult ) ) {
+				if ( throwException && ! rowProcessingState.hasCollectionInitializers ) {
+					throw new HibernateException(
+							String.format(
+									Locale.ROOT,
+									"Duplicate row was found and `%s` was specified",
+									UniqueSemantic.ASSERT
+							)
+					);
+				}
+
+				addResult = false;
+				break;
+			}
+		}
+
+		if ( addResult ) {
+			results.add( result );
+		}
+	}
+
+	public static <R> void duplicationErrorHandling(
+			R result,
+			JavaType<R> transformedJavaType,
+			List<R> results,
+			RowProcessingStateStandardImpl rowProcessingState) {
+		withDuplicationCheck(
+				result,
+				transformedJavaType,
+				results,
+				rowProcessingState,
+				true
+		);
+	}
+
+	public static <R> void applyAll(
+			R result,
+			JavaType<R> transformedJavaType,
+			List<R> results,
+			RowProcessingStateStandardImpl rowProcessingState) {
+		results.add( result );
+	}
+
+	private JavaType<R> resolveDomainResultJavaType(
+			Class<R> domainResultResultJavaType,
+			List<JavaType<?>> resultJavaTypes,
+			TypeConfiguration typeConfiguration) {
+		final JavaTypeRegistry javaTypeRegistry = typeConfiguration.getJavaTypeRegistry();
+
+		if ( domainResultResultJavaType != null ) {
+			return javaTypeRegistry.resolveDescriptor( domainResultResultJavaType );
+		}
+
+		if ( resultJavaTypes.size() == 1 ) {
+			//noinspection unchecked
+			return (JavaType<R>) resultJavaTypes.get( 0 );
+		}
+
+		return javaTypeRegistry.resolveDescriptor( Object[].class );
+	}
+
 	@Override
 	public boolean canResultsBeCached() {
 		return true;
 	}
+
+	@Override
+	public String toString() {
+		return "ListResultsConsumer(" + uniqueSemantic + ")";
+	}
 }

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

@@ -13,6 +13,9 @@ import org.hibernate.sql.results.jdbc.spi.JdbcValues;
 import org.hibernate.sql.results.jdbc.spi.JdbcValuesSourceProcessingOptions;
 
 /**
+ * Consumes {@link JdbcValues} and returns the consumed values in whatever form this
+ * consumer returns, generally a {@link java.util.List} or a {@link org.hibernate.ScrollableResults}
+ *
  * @author Steve Ebersole
  */
 public interface ResultsConsumer<T, R> {

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

@@ -23,27 +23,38 @@ import org.hibernate.type.descriptor.java.JavaType;
  */
 public interface RowReader<R> {
 	/**
-	 * The overall row result Java type.  Might be a scalar type, an
+	 * The type actually returned from this reader's {@link #readRow} call,
-	 * entity type, etc.  Might also be a `Object[].class` for multiple
+	 * accounting for any transformers.
-	 * results (domain selections).
+	 * <p/>
+	 * May be null to indicate that no transformation is applied.
+	 * <p/>
+	 * Ultimately intended for use in comparing values are being de-duplicated
 	 */
-	Class<R> getResultJavaType();
+	Class<R> getDomainResultResultJavaType();
 
 	/**
-	 *  The JavaTypes of the result
+	 * The row result Java type, before any transformations.
+	 *
+	 * @apiNote along with {@link #getResultJavaTypes()}, describes the "raw"
+	 * values as determined from the {@link org.hibernate.sql.results.graph.DomainResult}
+	 * references associated with the JdbcValues being processed
 	 */
-	List<JavaType> getResultJavaTypes();
+	Class<?> getResultJavaType();
 
 	/**
-	 * The initializers associated with this reader
+	 * The individual JavaType for each DomainResult
+	 */
+	List<JavaType<?>> getResultJavaTypes();
+
+	/**
+	 * The initializers associated with this reader.
+	 *
+	 * @see org.hibernate.sql.results.graph.DomainResult
 	 */
 	List<Initializer> getInitializers();
 
 	/**
 	 * The actual coordination of reading a row
-	 *
-	 * todo (6.0) : JdbcValuesSourceProcessingOptions is available through RowProcessingState - why pass it in separately
-	 * 		should use one approach or the other
 	 */
 	R readRow(RowProcessingState processingState, JdbcValuesSourceProcessingOptions options);
 

hibernate-core/src/main/java/org/hibernate/transform/AliasToBeanConstructorResultTransformer.java

@@ -9,11 +9,12 @@ package org.hibernate.transform;
 import java.lang.reflect.Constructor;
 
 import org.hibernate.QueryException;
+import org.hibernate.query.TypedTupleTransformer;
 
 /**
  * Wraps the tuples in a constructor call.
  */
-public class AliasToBeanConstructorResultTransformer<T> implements ResultTransformer<T> {
+public class AliasToBeanConstructorResultTransformer<T> implements ResultTransformer<T>, TypedTupleTransformer<T> {
 
 	private final Constructor<T> constructor;
 
@@ -26,6 +27,11 @@ public class AliasToBeanConstructorResultTransformer<T> implements ResultTransfo
 		this.constructor = constructor;
 	}
 
+	@Override
+	public Class<T> getTransformedType() {
+		return constructor.getDeclaringClass();
+	}
+
 	/**
 	 * Wrap the incoming tuples in a call to our configured constructor.
 	 */

hibernate-core/src/main/java/org/hibernate/transform/AliasToBeanResultTransformer.java

@@ -14,6 +14,7 @@ import org.hibernate.property.access.internal.PropertyAccessStrategyChainedImpl;
 import org.hibernate.property.access.internal.PropertyAccessStrategyFieldImpl;
 import org.hibernate.property.access.internal.PropertyAccessStrategyMapImpl;
 import org.hibernate.property.access.spi.Setter;
+import org.hibernate.query.TypedTupleTransformer;
 
 /**
  * Result transformer that allows to transform a result to
@@ -22,7 +23,7 @@ import org.hibernate.property.access.spi.Setter;
  *
  * @author max
  */
-public class AliasToBeanResultTransformer<T> implements ResultTransformer<T> {
+public class AliasToBeanResultTransformer<T> implements ResultTransformer<T>, TypedTupleTransformer<T> {
 
 	// IMPL NOTE : due to the delayed population of setters (setters cached
 	// 		for performance), we really cannot properly define equality for
@@ -41,6 +42,11 @@ public class AliasToBeanResultTransformer<T> implements ResultTransformer<T> {
 		this.resultClass = resultClass;
 	}
 
+	@Override
+	public Class<T> getTransformedType() {
+		return resultClass;
+	}
+
 	@Override
 	public T transformTuple(Object[] tuple, String[] aliases) {
 		T result;

hibernate-core/src/main/java/org/hibernate/transform/AliasToEntityMapResultTransformer.java

@@ -8,6 +8,7 @@ package org.hibernate.transform;
 import java.util.Map;
 
 import org.hibernate.internal.util.collections.CollectionHelper;
+import org.hibernate.query.TypedTupleTransformer;
 
 /**
  * {@link ResultTransformer} implementation which builds a map for each "row",
@@ -16,7 +17,7 @@ import org.hibernate.internal.util.collections.CollectionHelper;
  * @author Gavin King
  * @author Steve Ebersole
  */
-public class AliasToEntityMapResultTransformer implements ResultTransformer<Map<String,Object>> {
+public class AliasToEntityMapResultTransformer implements ResultTransformer<Map<String,Object>>, TypedTupleTransformer<Map<String,Object>> {
 
 	public static final AliasToEntityMapResultTransformer INSTANCE = new AliasToEntityMapResultTransformer();
 
@@ -26,6 +27,12 @@ public class AliasToEntityMapResultTransformer implements ResultTransformer<Map<
 	private AliasToEntityMapResultTransformer() {
 	}
 
+	@SuppressWarnings({ "rawtypes", "unchecked" })
+	@Override
+	public Class getTransformedType() {
+		return Map.class;
+	}
+
 	@Override
 	public Map<String,Object> transformTuple(Object[] tuple, String[] aliases) {
 		Map<String,Object> result = CollectionHelper.mapOfSize( tuple.length );

hibernate-core/src/main/java/org/hibernate/transform/ToListResultTransformer.java

@@ -9,10 +9,12 @@ package org.hibernate.transform;
 import java.util.Arrays;
 import java.util.List;
 
+import org.hibernate.query.TypedTupleTransformer;
+
 /**
  * Transforms each result row from a tuple into a {@link List} whose elements are each tuple value
  */
-public class ToListResultTransformer implements ResultTransformer<List<Object>> {
+public class ToListResultTransformer implements ResultTransformer<List<Object>>, TypedTupleTransformer<List<Object>> {
 	public static final ToListResultTransformer INSTANCE = new ToListResultTransformer();
 
 	/**
@@ -21,6 +23,12 @@ public class ToListResultTransformer implements ResultTransformer<List<Object>>
 	private ToListResultTransformer() {
 	}
 
+	@SuppressWarnings({ "unchecked", "rawtypes" })
+	@Override
+	public Class<List<Object>> getTransformedType() {
+		return (Class) List.class;
+	}
+
 	@Override
 	public List<Object> transformTuple(Object[] tuple, String[] aliases) {
 		return Arrays.asList( tuple );

hibernate-core/src/test/java/org/hibernate/orm/test/query/results/ImplicitSelectWithJoinTests.java

@@ -16,6 +16,7 @@ import org.hibernate.testing.orm.domain.StandardDomainModel;
 import org.hibernate.testing.orm.domain.retail.Product;
 import org.hibernate.testing.orm.domain.retail.Vendor;
 import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.JiraKey;
 import org.hibernate.testing.orm.junit.SessionFactory;
 import org.hibernate.testing.orm.junit.SessionFactoryScope;
 import org.junit.jupiter.api.AfterEach;
@@ -29,6 +30,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  */
 @DomainModel( standardModels = StandardDomainModel.RETAIL )
 @SessionFactory
+@JiraKey( "HHH-15133" )
 public class ImplicitSelectWithJoinTests {
 	private static final String HQL = "from Product p join p.vendor v where v.name like '%Steve%'";
 	private static final String HQL2 = "select p " + HQL;

hibernate-core/src/test/java/org/hibernate/orm/test/sql/results/ResultsShapeTests.java

@@ -0,0 +1,279 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.orm.test.sql.results;
+
+import java.util.List;
+import java.util.UUID;
+
+import javax.money.Monetary;
+import javax.money.MonetaryAmount;
+
+import jakarta.persistence.Tuple;
+
+import org.hibernate.query.TypedTupleTransformer;
+
+import org.hibernate.testing.orm.domain.StandardDomainModel;
+import org.hibernate.testing.orm.domain.retail.CardPayment;
+import org.hibernate.testing.orm.domain.retail.LineItem;
+import org.hibernate.testing.orm.domain.retail.Name;
+import org.hibernate.testing.orm.domain.retail.Order;
+import org.hibernate.testing.orm.domain.retail.Product;
+import org.hibernate.testing.orm.domain.retail.SalesAssociate;
+import org.hibernate.testing.orm.domain.retail.Vendor;
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.Jira;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Steve Ebersole
+ */
+@DomainModel( standardModels = StandardDomainModel.RETAIL )
+@SessionFactory
+@Jira( "https://hibernate.atlassian.net/browse/HHH-15133" )
+public class ResultsShapeTests {
+	@Test
+	public void testSimpleEntitySelection(SessionFactoryScope scope) {
+		scope.inTransaction( (session) -> {
+			final List<?> orders = session.createQuery( "select o from Order o" ).list();
+			// only 2 orders
+			assertThat( orders ).hasSize( 2 );
+			assertThat( orders.get( 0 ) ).isInstanceOf( Order.class );
+			assertThat( orders.get( 1 ) ).isInstanceOf( Order.class );
+		} );
+	}
+
+	@Test
+	public void testTypedEntitySelection(SessionFactoryScope scope) {
+		scope.inTransaction( (session) -> {
+			final List<Order> orders = session.createQuery( "select o from Order o", Order.class ).list();
+			// only 2 orders
+			assertThat( orders ).hasSize( 2 );
+			assertThat( orders.get( 0 ) ).isInstanceOf( Order.class );
+			assertThat( orders.get( 1 ) ).isInstanceOf( Order.class );
+		} );
+	}
+
+	@Test
+	public void testArrayTypedEntitySelection(SessionFactoryScope scope) {
+		scope.inTransaction( (session) -> {
+			final List<Object[]> orders = session.createQuery( "select o from Order o", Object[].class ).list();
+			// only 2 orders
+			assertThat( orders ).hasSize( 2 );
+			assertThat( orders.get( 0 ) ).isInstanceOf( Object[].class );
+			assertThat( orders.get( 1 ) ).isInstanceOf( Object[].class );
+		} );
+	}
+
+	@Test
+	public void testTupleTypedEntitySelection(SessionFactoryScope scope) {
+		scope.inTransaction( (session) -> {
+			final List<Tuple> orders = session.createQuery( "select o from Order o", Tuple.class ).list();
+			// only 2 orders
+			assertThat( orders ).hasSize( 2 );
+			assertThat( orders.get( 0 ) ).isInstanceOf( Tuple.class );
+			assertThat( orders.get( 1 ) ).isInstanceOf( Tuple.class );
+		} );
+	}
+
+	@Test
+	public void testDuplicatedTypedEntitySelection(SessionFactoryScope scope) {
+		scope.inTransaction( (session) -> {
+			final String hql = "select o from LineItem i join i.order o";
+			final List<Order> orders = session.createQuery( hql, Order.class ).list();
+			// because we select the entity and specify it as the result type, the results are de-duped
+			assertThat( orders ).hasSize( 2 );
+			assertThat( orders.get( 0 ) ).isInstanceOf( Order.class );
+			assertThat( orders.get( 1 ) ).isInstanceOf( Order.class );
+		} );
+	}
+
+	@Test
+	public void testDuplicatedArrayTypedEntitySelection(SessionFactoryScope scope) {
+		scope.inTransaction( (session) -> {
+			final String hql = "select o from LineItem i join i.order o";
+			final List<Object[]> orders = session.createQuery( hql, Object[].class ).list();
+			// because we select the entity again, but here specify the full array as the result type - the results are not de-duped
+			assertThat( orders ).hasSize( 3 );
+			assertThat( orders.get( 0 ) ).isInstanceOf( Object[].class );
+			assertThat( orders.get( 1 ) ).isInstanceOf( Object[].class );
+		} );
+	}
+
+	@Test
+	public void testDuplicatedTupleTypedEntitySelection(SessionFactoryScope scope) {
+		scope.inTransaction( (session) -> {
+			final String hql = "select o from LineItem i join i.order o";
+			final List<Tuple> orders = session.createQuery( hql, Tuple.class ).list();
+			// Tuple is a special case or Object[] - not de-duped
+			assertThat( orders ).hasSize( 3 );
+			assertThat( orders.get( 0 ) ).isInstanceOf( Tuple.class );
+			assertThat( orders.get( 1 ) ).isInstanceOf( Tuple.class );
+		} );
+	}
+
+	@Test
+	public void testTupleTransformedEntitySelection(SessionFactoryScope scope) {
+		scope.inTransaction( (session) -> {
+			final String hql = "select o from Order o";
+			final List<Order> orders = session.createQuery( hql, Order.class )
+					.setTupleTransformer( (tuple, aliases) -> (Order) tuple[ 0 ] )
+					.list();
+			// only 2 orders
+			assertThat( orders ).hasSize( 2 );
+			assertThat( orders.get( 0 ) ).isInstanceOf( Order.class );
+			assertThat( orders.get( 1 ) ).isInstanceOf( Order.class );
+		} );
+
+		scope.inTransaction( (session) -> {
+			final String hql = "select o from Order o";
+			final List<Order> orders = session.createQuery( hql )
+					.setTupleTransformer( (tuple, aliases) -> tuple[ 0 ] )
+					.list();
+			// only 2 orders
+			assertThat( orders ).hasSize( 2 );
+			assertThat( orders.get( 0 ) ).isInstanceOf( Order.class );
+			assertThat( orders.get( 1 ) ).isInstanceOf( Order.class );
+		} );
+	}
+
+	@Test
+	public void testDuplicatedTupleTransformedEntitySelection(SessionFactoryScope scope) {
+		scope.inTransaction( (session) -> {
+			final String hql = "select o from LineItem i join i.order o";
+			final List<Order> orders = session.createQuery( hql, Order.class )
+					.setTupleTransformer( (tuple, aliases) -> (Order) tuple[ 0 ] )
+					.list();
+			// only 2 orders
+			assertThat( orders ).hasSize( 2 );
+			assertThat( orders.get( 0 ) ).isInstanceOf( Order.class );
+			assertThat( orders.get( 1 ) ).isInstanceOf( Order.class );
+		} );
+
+		scope.inTransaction( (session) -> {
+			final String hql = "select o from LineItem i join i.order o";
+			final List<Order> orders = session.createQuery( hql )
+					.setTupleTransformer( (tuple, aliases) -> tuple[ 0 ] )
+					.list();
+			// only 2 orders
+			assertThat( orders ).hasSize( 2 );
+			assertThat( orders.get( 0 ) ).isInstanceOf( Order.class );
+			assertThat( orders.get( 1 ) ).isInstanceOf( Order.class );
+		} );
+	}
+
+
+	private final TypedTupleTransformer<Order> ORDER_TUPLE_TRANSFORMER = new TypedTupleTransformer<>() {
+		@Override
+		public Class<Order> getTransformedType() {
+			return Order.class;
+		}
+
+		@Override
+		public Order transformTuple(Object[] tuple, String[] aliases) {
+			return (Order) tuple[0];
+		}
+	};
+
+	@Test
+	public void testTypedTupleTransformedEntitySelection(SessionFactoryScope scope) {
+		scope.inTransaction( (session) -> {
+			final String hql = "select o from Order o";
+			final List<Order> orders = session.createQuery( hql, Order.class )
+					.setTupleTransformer( ORDER_TUPLE_TRANSFORMER )
+					.list();
+			assertThat( orders ).hasSize( 2 );
+			assertThat( orders.get( 0 ) ).isInstanceOf( Order.class );
+			assertThat( orders.get( 1 ) ).isInstanceOf( Order.class );
+		} );
+
+		scope.inTransaction( (session) -> {
+			final String hql = "select o from Order o";
+			final List<Order> orders = session.createQuery( hql )
+					.setTupleTransformer( ORDER_TUPLE_TRANSFORMER )
+					.list();
+			assertThat( orders ).hasSize( 2 );
+			assertThat( orders.get( 0 ) ).isInstanceOf( Order.class );
+			assertThat( orders.get( 1 ) ).isInstanceOf( Order.class );
+		} );
+	}
+
+	@Test
+	public void testDuplicatedTypedTupleTransformedEntitySelection(SessionFactoryScope scope) {
+		final String hql = "select o from LineItem i join i.order o";
+
+		scope.inTransaction( (session) -> {
+			final List<Order> orders = session.createQuery( hql, Order.class )
+					.setTupleTransformer( (tuple, aliases) -> (Order) tuple[0] )
+					.list();
+			assertThat( orders ).hasSize( 2 );
+			assertThat( orders.get( 0 ) ).isInstanceOf( Order.class );
+			assertThat( orders.get( 1 ) ).isInstanceOf( Order.class );
+		} );
+
+		scope.inTransaction( (session) -> {
+			final List<Order> orders = session.createQuery( hql )
+					.setTupleTransformer( (tuple, aliases) -> tuple[ 0 ] )
+					.list();
+			assertThat( orders ).hasSize( 2 );
+			assertThat( orders.get( 0 ) ).isInstanceOf( Order.class );
+			assertThat( orders.get( 1 ) ).isInstanceOf( Order.class );
+		} );
+	}
+
+	@BeforeEach
+	public void prepareTestData(SessionFactoryScope scope) {
+		scope.inTransaction( (session) -> {
+			final Vendor acme = new Vendor( 1, "Acme, Inc.", null );
+			session.persist( acme );
+
+			final Product widget = new Product( 1, UUID.randomUUID(), acme );
+			session.persist( widget );
+
+			final SalesAssociate associate = new SalesAssociate( 1, new Name( "John", "Doe" ) );
+			session.persist( associate );
+
+			final MonetaryAmount oneDollar = Monetary.getDefaultAmountFactory()
+					.setNumber( 1 )
+					.setCurrency( "USD" )
+					.create();
+
+			final CardPayment payment1 = new CardPayment( 1, 123, oneDollar );
+			session.persist( payment1 );
+			final Order order1 = new Order( 1, payment1, associate );
+			session.persist( order1 );
+			final LineItem lineItem11 = new LineItem( 11, widget, 1, oneDollar, order1 );
+			session.persist( lineItem11 );
+			final LineItem lineItem12 = new LineItem( 12, widget, 1, oneDollar, order1 );
+			session.persist( lineItem12 );
+
+			final CardPayment payment2 = new CardPayment( 2, 321, oneDollar );
+			session.persist( payment2 );
+			final Order order2 = new Order( 2, payment2, associate );
+			session.persist( order2 );
+			final LineItem lineItem2 = new LineItem( 2, widget, 1, oneDollar, order2 );
+			session.persist( lineItem2 );
+		} );
+	}
+
+	@AfterEach
+	public void dropTestData(SessionFactoryScope scope) {
+		scope.inTransaction( (session) -> {
+			session.createMutationQuery( "delete LineItem" ).executeUpdate();
+			session.createMutationQuery( "delete Order" ).executeUpdate();
+			session.createMutationQuery( "delete Payment" ).executeUpdate();
+			session.createMutationQuery( "delete Product" ).executeUpdate();
+			session.createMutationQuery( "delete Vendor" ).executeUpdate();
+			session.createMutationQuery( "delete SalesAssociate" ).executeUpdate();
+		} );
+	}
+}

hibernate-testing/src/main/java/org/hibernate/testing/orm/domain/retail/LineItem.java

@@ -25,6 +25,22 @@ public class LineItem {
 
 	private Order order;
 
+	public LineItem() {
+	}
+
+	public LineItem(
+			Integer id,
+			Product product,
+			int quantity,
+			MonetaryAmount subTotal,
+			Order order) {
+		this.id = id;
+		this.product = product;
+		this.quantity = quantity;
+		this.subTotal = subTotal;
+		this.order = order;
+	}
+
 	@Id
 	public Integer getId() {
 		return id;

hibernate-testing/src/main/java/org/hibernate/testing/orm/domain/retail/Order.java

@@ -25,6 +25,20 @@ public class Order {
 	private Payment payment;
 	private SalesAssociate salesAssociate;
 
+	public Order() {
+	}
+
+	public Order(Integer id, Payment payment, SalesAssociate salesAssociate) {
+		this( id, Instant.now(), payment, salesAssociate );
+	}
+
+	public Order(Integer id, Instant transacted, Payment payment, SalesAssociate salesAssociate) {
+		this.id = id;
+		this.transacted = transacted;
+		this.payment = payment;
+		this.salesAssociate = salesAssociate;
+	}
+
 	@Id
 	public Integer getId() {
 		return id;

hibernate-testing/src/main/java/org/hibernate/testing/orm/junit/Jira.java

@@ -0,0 +1,31 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.testing.orm.junit;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Repeatable;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Specifies the URL to the Jira issue associated with a test.
+ * Is repeatable, so multiple JIRA issues can be indicated.
+ *
+ * @see JiraGroup
+ *
+ * @author Steve Ebersole
+ */
+@Retention( RetentionPolicy.RUNTIME )
+@Target({ElementType.TYPE, ElementType.METHOD})
+@Repeatable( JiraGroup.class  )
+public @interface Jira {
+	/**
+	 * The URL to the Jira issue
+	 */
+	String value();
+}

hibernate-testing/src/main/java/org/hibernate/testing/orm/junit/JiraGroup.java

@@ -0,0 +1,25 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.testing.orm.junit;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Grouping annotation for `@Jira`
+ *
+ * @see Jira
+ *
+ * @author Steve Ebersole
+ */
+@Retention( RetentionPolicy.RUNTIME )
+@Target({ElementType.TYPE, ElementType.METHOD})
+public @interface JiraGroup {
+	Jira[] value();
+}