HHH-15644 Add reproducer test

hibernate-core/src/test/java/org/hibernate/orm/test/batch/EmbeddableBatchingTest.java

@@ -0,0 +1,68 @@
+package org.hibernate.orm.test.batch;
+
+import org.hibernate.cfg.Environment;
+
+import org.hibernate.testing.TestForIssue;
+import org.hibernate.testing.orm.junit.EntityManagerFactoryScope;
+import org.hibernate.testing.orm.junit.Jpa;
+import org.hibernate.testing.orm.junit.Setting;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Embeddable;
+import jakarta.persistence.Embedded;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.OneToOne;
+import jakarta.persistence.criteria.CriteriaBuilder;
+import jakarta.persistence.criteria.CriteriaQuery;
+
+@Jpa(
+		annotatedClasses = {
+				EmbeddableBatchingTest.A.class,
+				EmbeddableBatchingTest.C.class
+		},
+		integrationSettings = { @Setting(name = Environment.DEFAULT_BATCH_FETCH_SIZE, value = "2") }
+)
+@TestForIssue(jiraKey = "HHH-15644")
+class EmbeddableBatchingTest {
+
+	@Test
+	void testSelect(EntityManagerFactoryScope scope) {
+		scope.inEntityManager(
+				entityManager -> {
+					final CriteriaBuilder cb = entityManager.getCriteriaBuilder();
+					final CriteriaQuery<A> c = cb.createQuery( A.class );
+					c.from( A.class );
+					entityManager.createQuery( c ).getResultList();
+				}
+		);
+	}
+
+	@Entity
+	public static class A {
+
+		@Id
+		private Integer id;
+
+		@Embedded
+		private B b;
+
+	}
+
+	@Embeddable
+	public static class B {
+
+		@OneToOne
+		private C c;
+
+	}
+
+	@Entity
+	public static class C {
+
+		@Id
+		private Integer id;
+
+	}
+
+}