From 459c6f427ae8b841b2a467a5ec02ca0db6584bda Mon Sep 17 00:00:00 2001
From: Christian Beikov <christian.beikov@gmail.com>
Date: Fri, 3 Nov 2023 17:25:23 +0100
Subject: [PATCH] HHH-17385 Missing table for superclass when joining subclass
 association

---
 .../TreatJoinOptimizationTest.java            | 58 +++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 hibernate-core/src/test/java/org/hibernate/orm/test/inheritance/TreatJoinOptimizationTest.java

diff --git a/hibernate-core/src/test/java/org/hibernate/orm/test/inheritance/TreatJoinOptimizationTest.java b/hibernate-core/src/test/java/org/hibernate/orm/test/inheritance/TreatJoinOptimizationTest.java
new file mode 100644
index 0000000000..d4043068ad
--- /dev/null
+++ b/hibernate-core/src/test/java/org/hibernate/orm/test/inheritance/TreatJoinOptimizationTest.java
@@ -0,0 +1,58 @@
+/*
+ * 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.inheritance;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.Inheritance;
+import jakarta.persistence.InheritanceType;
+import jakarta.persistence.OneToMany;
+import jakarta.persistence.Table;
+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.Test;
+
+import java.util.HashSet;
+import java.util.Set;
+
+@DomainModel( annotatedClasses = {
+		TreatJoinOptimizationTest.JoinedBase.class,
+		TreatJoinOptimizationTest.JoinedSub1.class
+} )
+@SessionFactory
+@JiraKey( "HHH-17385" )
+public class TreatJoinOptimizationTest {
+
+	@Test
+	public void testSelectSuperclassAttributeOfJoinedSubclassCollection(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			session.createSelectionQuery(
+				"SELECT s1.value FROM JoinedBase b JOIN b.children s1",
+				Integer.class
+			).getResultList();
+		} );
+	}
+
+	@Entity( name = "JoinedBase" )
+	@Inheritance( strategy = InheritanceType.JOINED )
+	public static abstract class JoinedBase {
+		@Id
+		private Long id;
+		@Column(name = "val")
+		private Integer value;
+	}
+
+	@Entity( name = "JoinedSub1" )
+	@Table( name = "joined_sub_1" )
+	public static class JoinedSub1 extends JoinedBase {
+		@OneToMany
+		private Set<JoinedSub1> children = new HashSet<>();
+	}
+}