HHH-17405 Handle generic mapped superclass path sources

hibernate-core/src/main/java/org/hibernate/metamodel/model/domain/internal/MappedSuperclassSqmPathSource.java

@@ -20,12 +20,16 @@ import org.hibernate.query.sqm.tree.from.SqmFrom;
  * @author Steve Ebersole
  */
 public class MappedSuperclassSqmPathSource<J> extends AbstractSqmPathSource<J> implements SqmJoinable<Object, J> {
+	private final boolean isGeneric;
+
 	public MappedSuperclassSqmPathSource(
 			String localPathName,
 			SqmPathSource<J> pathModel,
 			MappedSuperclassDomainType<J> domainType,
-			BindableType jpaBindableType) {
+			BindableType jpaBindableType,
+			boolean isGeneric) {
 		super( localPathName, pathModel, domainType, jpaBindableType );
+		this.isGeneric = isGeneric;
 	}
 
 	@Override
@@ -39,6 +43,11 @@ public class MappedSuperclassSqmPathSource<J> extends AbstractSqmPathSource<J> i
 		return sqmPathType.findSubPathSource( name );
 	}
 
+	@Override
+	public boolean isGeneric() {
+		return isGeneric;
+	}
+
 	@Override
 	public SqmPath<J> createSqmPath(SqmPath<?> lhs, SqmPathSource<?> intermediatePathSource) {
 		return new SqmEntityValuedSimplePath<>(

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

@@ -147,7 +147,8 @@ public class SqmMappingModelHelper {
 					name,
 					pathModel,
 					(MappedSuperclassDomainType<J>) valueDomainType,
-					jpaBindableType
+					jpaBindableType,
+					isGeneric
 			);
 		}