HHH-18584 fix logic for deciding if something is implicitly selectable

implicit joins should not be added to the select list!

Signed-off-by: Gavin King <gavin@hibernate.org>

hibernate-core/src/main/java/org/hibernate/query/hql/internal/SemanticQueryBuilder.java

@@ -1286,10 +1286,10 @@ private SqmFromClause buildInferredFromClause(HqlParser.SelectClauseContext sele
 		}
 	}
 
-	@SuppressWarnings("rawtypes")
 	private EntityDomainType<R> getResultEntity() {
 		final JpaMetamodelImplementor jpaMetamodel = creationContext.getJpaMetamodel();
 		if ( expectedResultEntity != null ) {
+			@SuppressWarnings("rawtypes")
 			final EntityDomainType entityDescriptor = jpaMetamodel.entity( expectedResultEntity );
 			if ( entityDescriptor == null ) {
 				throw new SemanticException( "Query has no 'from' clause, and the result type '"
@@ -1331,7 +1331,8 @@ protected SqmSelectClause buildInferredSelectClause(SqmFromClause fromClause) {
 				// we found an entity with the alias 'this'
 				// assigned explicitly, JPA says we should
 				// infer the select list 'select this'
-				SqmSelectClause selectClause = new SqmSelectClause( false, 1, nodeBuilder );
+				final SqmSelectClause selectClause =
+						new SqmSelectClause( false, 1, nodeBuilder );
 				selectClause.addSelection( new SqmSelection<>( sqmRoot, "this", nodeBuilder) );
 				return selectClause;
 			}
@@ -1353,7 +1354,7 @@ protected SqmSelectClause buildInferredSelectClause(SqmFromClause fromClause) {
 				// we may safely assume the query returns that entity
 				if ( fromClause.getNumberOfRoots() == 1 ) {
 					final SqmRoot<?> sqmRoot = fromClause.getRoots().get(0);
-					if ( sqmRoot.hasTrueJoin() ) {
+					if ( sqmRoot.hasImplicitlySelectableJoin() ) {
 						// the entity has joins, and doesn't explicitly have
 						// the alias 'this', so the 'select' list cannot be
 						// inferred
@@ -1365,7 +1366,8 @@ protected SqmSelectClause buildInferredSelectClause(SqmFromClause fromClause) {
 					// 'this', and that we should infer 'select this', but we
 					// accept even the case where the entity has an explicit
 					// alias, and infer 'select explicit_alias'
-					SqmSelectClause selectClause = new SqmSelectClause( false, 1, nodeBuilder );
+					final SqmSelectClause selectClause =
+							new SqmSelectClause( false, 1, nodeBuilder );
 					selectClause.addSelection( new SqmSelection<>( sqmRoot, sqmRoot.getAlias(), nodeBuilder) );
 					return selectClause;
 				}
@@ -1398,7 +1400,8 @@ protected SqmSelectClause buildInferredSelectClause(SqmFromClause fromClause) {
 					else {
 						// exactly one root entity, return it
 						// (joined entities are not returned)
-						final SqmSelectClause selectClause = new SqmSelectClause( false, 1, nodeBuilder );
+						final SqmSelectClause selectClause =
+								new SqmSelectClause( false, 1, nodeBuilder );
 						selectClause.addSelection( new SqmSelection<>( sqmRoot, sqmRoot.getAlias(), nodeBuilder) );
 						return selectClause;
 					}

hibernate-core/src/main/java/org/hibernate/query/sqm/tree/domain/AbstractSqmAttributeJoin.java

@@ -12,7 +12,6 @@
 import org.hibernate.query.criteria.JpaPredicate;
 import org.hibernate.query.sqm.NodeBuilder;
 import org.hibernate.query.sqm.SemanticQueryWalker;
-import org.hibernate.query.sqm.SqmJoinable;
 import org.hibernate.query.sqm.SqmPathSource;
 import org.hibernate.query.sqm.spi.SqmCreationHelper;
 import org.hibernate.query.sqm.tree.SqmJoinType;
@@ -33,48 +32,38 @@ public abstract class AbstractSqmAttributeJoin<L, R>
 		extends AbstractSqmJoin<L, R>
 		implements SqmAttributeJoin<L, R> {
 
-	private boolean fetched;
+	private final boolean implicitJoin;
+	private boolean fetchJoin;
 
-	@SuppressWarnings({ "rawtypes", "unchecked" })
-	public AbstractSqmAttributeJoin(
-			SqmFrom<?, L> lhs,
-			SqmJoinable joinedNavigable,
-			String alias,
-			SqmJoinType joinType,
-			boolean fetched,
-			NodeBuilder nodeBuilder) {
-		//noinspection StringEquality
-		this(
-				lhs,
-				joinedNavigable.createNavigablePath( lhs, alias ),
-				joinedNavigable,
-				alias == SqmCreationHelper.IMPLICIT_ALIAS ? null : alias,
-				joinType,
-				fetched,
-				nodeBuilder
-		);
-	}
-
-	@SuppressWarnings("rawtypes")
 	protected AbstractSqmAttributeJoin(
 			SqmFrom<?, L> lhs,
 			NavigablePath navigablePath,
-			SqmJoinable joinedNavigable,
+			SqmPathSource<R> joinedNavigable,
 			String alias,
 			SqmJoinType joinType,
-			boolean fetched,
+			boolean fetchJoin,
 			NodeBuilder nodeBuilder) {
-		//noinspection unchecked
 		super(
 				navigablePath,
-				(SqmPathSource<R>) joinedNavigable,
+				joinedNavigable,
 				lhs,
-				alias,
+				isImplicitAlias( alias ) ? null : alias,
 				joinType,
 				nodeBuilder
 		);
-		this.fetched = fetched;
+		this.fetchJoin = fetchJoin;
 		validateFetchAlias( alias );
+		implicitJoin = isImplicitAlias( alias ); //TODO: add a parameter
+	}
+
+	@SuppressWarnings("StringEquality")
+	private static boolean isImplicitAlias(String alias) {
+		return alias == SqmCreationHelper.IMPLICIT_ALIAS;
+	}
+
+	@Override
+	public boolean isImplicitJoin() {
+		return implicitJoin;
 	}
 
 	@Override
@@ -89,7 +78,7 @@ public JavaType<R> getNodeJavaType() {
 
 	@Override
 	public boolean isFetched() {
-		return fetched;
+		return fetchJoin;
 	}
 
 	@Override
@@ -100,11 +89,11 @@ public SqmAttributeJoin<L,R> alias(String name) {
 
 	@Override
 	public void clearFetched() {
-		fetched = false;
+		fetchJoin = false;
 	}
 
 	private void validateFetchAlias(String alias) {
-		if ( fetched && alias != null && nodeBuilder().isJpaQueryComplianceEnabled() ) {
+		if ( fetchJoin && alias != null && nodeBuilder().isJpaQueryComplianceEnabled() ) {
 			throw new IllegalStateException(
 					"The JPA specification does not permit specifying an alias for fetch joins."
 			);

hibernate-core/src/main/java/org/hibernate/query/sqm/tree/domain/AbstractSqmFrom.java

@@ -60,7 +60,6 @@
 import jakarta.persistence.metamodel.SetAttribute;
 import jakarta.persistence.metamodel.SingularAttribute;
 
-import static org.hibernate.metamodel.AttributeClassification.EMBEDDED;
 import static org.hibernate.query.sqm.internal.SqmUtil.findCompatibleFetchJoin;
 
 /**
@@ -163,9 +162,8 @@ public SqmPath<?> resolvePathPart(
 		SqmPath<?> resolvedPath = null;
 		for ( SqmJoin<?, ?> sqmJoin : getSqmJoins() ) {
 			// We can only match singular joins here, as plural path parts are interpreted like sub-queries
-			if ( sqmJoin instanceof SqmSingularJoin<?, ?>
+			if ( sqmJoin instanceof SqmSingularJoin<?, ?> attributeJoin
 					&& name.equals( sqmJoin.getReferencedPathSource().getPathName() ) ) {
-				final SqmAttributeJoin<?, ?> attributeJoin = (SqmAttributeJoin<?, ?>) sqmJoin;
 				if ( attributeJoin.getOn() == null ) {
 					// todo (6.0): to match the expectation of the JPA spec I think we also have to check
 					//  that the join type is INNER or the default join type for the attribute,
@@ -223,8 +221,7 @@ public void addSqmJoin(SqmJoin<T, ?> join) {
 	public void removeLeftFetchJoins() {
 		if ( joins != null ) {
 			for ( SqmJoin<T, ?> join : new ArrayList<>(joins) ) {
-				if ( join instanceof SqmAttributeJoin ) {
-					final SqmAttributeJoin<T, ?> attributeJoin = (SqmAttributeJoin<T, ?>) join;
+				if ( join instanceof SqmAttributeJoin<T, ?> attributeJoin ) {
 					if ( attributeJoin.isFetched() ) {
 						if ( join.getSqmJoinType() == SqmJoinType.LEFT ) {
 							joins.remove( join );
@@ -306,11 +303,10 @@ public boolean isCorrelated() {
 	}
 
 	@Override
-	public boolean hasTrueJoin() {
+	public boolean hasImplicitlySelectableJoin() {
 		return getSqmJoins().stream()
 				.anyMatch( sqmJoin -> sqmJoin instanceof SqmAttributeJoin<?,?> attributeJoin
-						&& !attributeJoin.isFetched()
-						&& attributeJoin.getAttribute().getAttributeClassification()!=EMBEDDED );
+						&& attributeJoin.isImplicitlySelectable() );
 	}
 
 	@Override
@@ -642,8 +638,7 @@ public <X> JpaCrossJoin<X> crossJoin(Class<X> entityJavaType) {
 
 	@Override
 	public <X> JpaCrossJoin<X> crossJoin(EntityDomainType<X> entity) {
-		//noinspection unchecked
-		final SqmCrossJoin<X> crossJoin = new SqmCrossJoin<>( entity, null, (SqmRoot<X>) findRoot() );
+		final SqmCrossJoin<X> crossJoin = new SqmCrossJoin<>( entity, null, findRoot() );
 		// noinspection unchecked
 		addSqmJoin( (SqmJoin<T, ?>) crossJoin );
 		return crossJoin;

hibernate-core/src/main/java/org/hibernate/query/sqm/tree/domain/AbstractSqmPluralJoin.java

@@ -35,7 +35,15 @@ public AbstractSqmPluralJoin(
 			SqmJoinType joinType,
 			boolean fetched,
 			NodeBuilder nodeBuilder) {
-		super( lhs, joinedNavigable, alias, joinType, fetched, nodeBuilder );
+		super(
+				lhs,
+				joinedNavigable.createNavigablePath( lhs, alias ),
+				joinedNavigable,
+				alias,
+				joinType,
+				fetched,
+				nodeBuilder
+		);
 	}
 
 	protected AbstractSqmPluralJoin(

hibernate-core/src/main/java/org/hibernate/query/sqm/tree/domain/SqmSingularJoin.java

@@ -15,7 +15,6 @@
 import org.hibernate.query.sqm.SemanticQueryWalker;
 import org.hibernate.spi.NavigablePath;
 import org.hibernate.query.sqm.NodeBuilder;
-import org.hibernate.query.sqm.SqmJoinable;
 import org.hibernate.query.sqm.tree.SqmCopyContext;
 import org.hibernate.query.sqm.tree.SqmJoinType;
 import org.hibernate.query.sqm.tree.from.SqmFrom;
@@ -25,6 +24,7 @@
  * @author Steve Ebersole
  */
 public class SqmSingularJoin<O,T> extends AbstractSqmAttributeJoin<O,T> implements SqmSingularValuedJoin<O,T> {
+
 	public SqmSingularJoin(
 			SqmFrom<?,O> lhs,
 			SingularPersistentAttribute<O, T> joinedNavigable,
@@ -32,17 +32,15 @@ public SqmSingularJoin(
 			SqmJoinType joinType,
 			boolean fetched,
 			NodeBuilder nodeBuilder) {
-		super( lhs, joinedNavigable, alias, joinType, fetched, nodeBuilder );
-	}
-
-	public SqmSingularJoin(
-			SqmFrom<?,O> lhs,
-			SqmJoinable<? extends O, T> joinedNavigable,
-			String alias,
-			SqmJoinType joinType,
-			boolean fetched,
-			NodeBuilder nodeBuilder) {
-		super( lhs, joinedNavigable, alias, joinType, fetched, nodeBuilder );
+		super(
+				lhs,
+				joinedNavigable.createNavigablePath( lhs, alias ),
+				joinedNavigable,
+				alias,
+				joinType,
+				fetched,
+				nodeBuilder
+		);
 	}
 
 	@Override

hibernate-core/src/main/java/org/hibernate/query/sqm/tree/from/SqmAttributeJoin.java

@@ -30,7 +30,7 @@ public interface SqmAttributeJoin<O,T> extends SqmJoin<O,T>, JpaFetch<O,T>, JpaJ
 
 	@Override
 	default boolean isImplicitlySelectable() {
-		return !isFetched();
+		return !isFetched() && !isImplicitJoin();
 	}
 
 	@Override
@@ -39,8 +39,16 @@ default boolean isImplicitlySelectable() {
 	@Override
 	JavaType<T> getJavaTypeDescriptor();
 
+	/**
+	 * Is this a fetch join?
+	 */
 	boolean isFetched();
 
+	/**
+	 * Is this an implicit join inferred from a path expression?
+	 */
+	boolean isImplicitJoin();
+
 	@Internal
 	void clearFetched();
 

hibernate-core/src/main/java/org/hibernate/query/sqm/tree/from/SqmFrom.java

@@ -102,7 +102,7 @@ default boolean hasTreats() {
 	<Y> SqmEntityJoin<R, Y> join(Class<Y> entityClass, JoinType joinType);
 
 	@Incubating
-	boolean hasTrueJoin();
+	boolean hasImplicitlySelectableJoin();
 
 	@Override
 	<A> SqmSingularJoin<R, A> join(SingularAttribute<? super R, A> attribute);