HHH-9407 Test showing MapsId loses embeddable column configuration

hibernate-core/src/test/java/org/hibernate/orm/test/annotations/mapsid/MapsEmbeddedIdNamingTest.java

@@ -0,0 +1,85 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.orm.test.annotations.mapsid;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Embeddable;
+import jakarta.persistence.EmbeddedId;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.JoinColumns;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.MapsId;
+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;
+
+@SessionFactory
+@DomainModel(
+		annotatedClasses = {MapsEmbeddedIdNamingTest.BaseEntity.class, MapsEmbeddedIdNamingTest.BaseExtensionEntity.class, MapsEmbeddedIdNamingTest.ReferringEntity.class})
+@Jira("https://hibernate.atlassian.net/browse/HHH-9407")
+public class MapsEmbeddedIdNamingTest {
+
+	@Test
+	void test(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			BaseEntity base = new BaseEntity();
+			base.id = 1;
+			session.persist( base );
+
+			BaseExtensionEntity extensionEntity = new BaseExtensionEntity();
+			extensionEntity.id = new BaseExtensionId( base.id, 1 );
+			extensionEntity.base = base;
+			session.persist( extensionEntity );
+
+			ReferringEntity referringEntity = new ReferringEntity();
+			referringEntity.id = 1;
+			referringEntity.extension = extensionEntity;
+			session.persist( referringEntity );
+		} );
+	}
+
+	@Entity
+	public static class BaseEntity {
+		@Id
+		@Column(name = "base_id")
+		public Integer id;
+	}
+
+	@Entity
+	public static class BaseExtensionEntity {
+		@EmbeddedId
+		public BaseExtensionId id;
+		@ManyToOne(optional = false)
+		@MapsId("baseId")
+		public BaseEntity base;
+	}
+
+	@Embeddable
+	public record BaseExtensionId(
+			@Column(name = "base_id")
+			Integer baseId,
+			@Column(name = "ext_number")
+			int extensionNumber) {
+	}
+
+	@Entity
+	public static class ReferringEntity {
+		@Id
+		Integer id;
+
+		@ManyToOne(optional = false)
+		@JoinColumns({
+				@JoinColumn(name = "base_id", referencedColumnName = "base_id", insertable = false, updatable = false),
+				@JoinColumn(name = "ext_number", referencedColumnName = "ext_number", insertable = false,
+						updatable = false)
+		})
+		public BaseExtensionEntity extension;
+	}
+
+}