HHH-19745 Test subquery that shadows alias of outer query to stress identity sensitive operations

Author: beikov

hibernate-core/src/test/java/org/hibernate/orm/test/query/SubQueryShadowingTest.java

@@ -0,0 +1,59 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.orm.test.query;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+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.Test;
+
+
+@DomainModel(
+		annotatedClasses = {
+				SubQueryShadowingTest.TestEntity.class,
+		}
+)
+@SessionFactory
+public class SubQueryShadowingTest {
+
+	@Test
+	@Jira("https://hibernate.atlassian.net/browse/HHH-19745")
+	public void testSelectCase(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			session.createQuery(
+							"""
+							from TestEntity t
+							left join TestEntity t2 on exists (
+								select 1
+								from TestEntity t
+								order by t.id
+								limit 1
+							)
+							""", TestEntity.class )
+					.list();
+		} );
+	}
+
+	@Entity(name = "TestEntity")
+	public static class TestEntity {
+
+		@Id
+		@GeneratedValue
+		private Long id;
+
+		private String name;
+
+		public TestEntity() {
+		}
+
+		public TestEntity(String name) {
+			this.name = name;
+		}
+	}
+}