HHH-17832 Register projection usage for circular bidirectional fetch

Author: mbellade

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

@@ -60,6 +60,7 @@
 import org.hibernate.metamodel.model.domain.NavigableRole;
 import org.hibernate.persister.collection.AbstractCollectionPersister;
 import org.hibernate.persister.entity.AbstractEntityPersister;
+import org.hibernate.persister.entity.EntityNameUse;
 import org.hibernate.persister.entity.EntityPersister;
 import org.hibernate.property.access.spi.PropertyAccess;
 import org.hibernate.spi.EntityIdentifierNavigablePath;
@@ -1295,6 +1296,12 @@ else if ( CollectionPart.Nature.fromNameExact( parentNavigablePath.getLocalName(
 				final FromClauseAccess fromClauseAccess = creationState.getSqlAstCreationState().getFromClauseAccess();
 				final TableGroup tableGroup = fromClauseAccess.getTableGroup( referencedNavigablePath );
 				fromClauseAccess.registerTableGroup( fetchablePath, tableGroup );
+				// Register a PROJECTION usage as we're effectively selecting the bidirectional association
+				creationState.getSqlAstCreationState().registerEntityNameUsage(
+						tableGroup,
+						EntityNameUse.PROJECTION,
+						entityMappingType.getEntityName()
+				);
 				return buildEntityFetchJoined(
 						fetchParent,
 						this,

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

@@ -3031,7 +3031,12 @@ public void registerEntityNameUsage(
 			TableGroup tableGroup,
 			EntityNameUse entityNameUse,
 			String hibernateEntityName) {
-		registerEntityNameUsage( tableGroup, entityNameUse, hibernateEntityName, false );
+		registerEntityNameUsage(
+				tableGroup,
+				entityNameUse,
+				hibernateEntityName,
+				entityNameUse.getKind() == EntityNameUse.UseKind.PROJECTION
+		);
 	}
 
 	private void registerEntityNameUsage(