HHH-18470: fix duplicate generated FK names for TABLE_PER_CLASS inheritance

hibernate-core/src/main/java/org/hibernate/mapping/DenormalizedTable.java

@@ -70,10 +70,12 @@ public class DenormalizedTable extends Table {
 			if ( foreignKey.getReferencedTable() == null ) {
 				foreignKey.setReferencedTable( referencedClass.getTable() );
 			}
+
+			final ForeignKey denormalizedForeignKey = createDenormalizedForeignKey( foreignKey );
 			createForeignKey(
 					context.getBuildingOptions()
 							.getImplicitNamingStrategy()
-							.determineForeignKeyName( new ForeignKeyNameSource( foreignKey, this, context ) )
+							.determineForeignKeyName( new ForeignKeyNameSource( denormalizedForeignKey, this, context ) )
 							.render( context.getMetadataCollector().getDatabase().getDialect() ),
 					foreignKey.getColumns(),
 					foreignKey.getReferencedEntityName(),
@@ -83,6 +85,18 @@ public class DenormalizedTable extends Table {
 		}
 	}
 
+	private ForeignKey createDenormalizedForeignKey(ForeignKey includedTableFk) {
+		final ForeignKey denormalizedForeignKey = new ForeignKey();
+		denormalizedForeignKey.setReferencedEntityName( includedTableFk.getReferencedEntityName() );
+		denormalizedForeignKey.setKeyDefinition( includedTableFk.getKeyDefinition() );
+		denormalizedForeignKey.setReferencedTable( includedTableFk.getReferencedTable() );
+		denormalizedForeignKey.addReferencedColumns( includedTableFk.getReferencedColumns() );
+		for ( Column keyColumn : includedTableFk.getColumns() ) {
+			denormalizedForeignKey.addColumn( keyColumn );
+		}
+		return denormalizedForeignKey;
+	}
+
 	@Override
 	public Column getColumn(Column column) {
 		Column superColumn = super.getColumn( column );

hibernate-core/src/test/java/org/hibernate/orm/test/inheritance/DenormalizedTableForeignKeyGeneratorTest.java

@@ -0,0 +1,95 @@
+package org.hibernate.orm.test.inheritance;
+
+import jakarta.persistence.*;
+import org.hibernate.dialect.H2Dialect;
+import org.hibernate.testing.orm.junit.EntityManagerFactoryScope;
+import org.hibernate.testing.orm.junit.JiraKey;
+import org.hibernate.testing.orm.junit.Jpa;
+import org.hibernate.testing.orm.junit.RequiresDialect;
+import org.junit.jupiter.api.Test;
+
+import java.io.Serializable;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Paria Hosseiny
+ */
+@JiraKey("HHH-18470")
+@Jpa(
+        annotatedClasses = {
+                DenormalizedTableForeignKeyGeneratorTest.Employee.class,
+                DenormalizedTableForeignKeyGeneratorTest.Manager.class,
+                DenormalizedTableForeignKeyGeneratorTest.Address.class,
+                DenormalizedTableForeignKeyGeneratorTest.Territory.class
+        }
+)
+
+@RequiresDialect(H2Dialect.class)
+public class DenormalizedTableForeignKeyGeneratorTest {
+
+    @Test
+    public void shouldCreateForeignKeyForSubclasses(EntityManagerFactoryScope scope) {
+        scope.inTransaction(
+                entityManager -> {
+                    String managerQuery = "select CONSTRAINT_NAME FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS " +
+                            "WHERE TABLE_NAME='MANAGER' " +
+                            "AND CONSTRAINT_TYPE='FOREIGN KEY'";
+                    List<String> managerForeignKeyNames = entityManager.createNativeQuery(managerQuery).getResultList();
+
+                    String employeeQuery = "select CONSTRAINT_NAME FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS " +
+                            "WHERE TABLE_NAME='EMPLOYEE' " +
+                            "AND CONSTRAINT_TYPE='FOREIGN KEY'";
+                    String employeeForeignKeyName = entityManager.createNativeQuery(employeeQuery).getSingleResult().toString();
+
+                    assertThat(employeeForeignKeyName).isNotNull();
+                    assertThat(managerForeignKeyNames).isNotNull().hasSize(2);
+                    assertThat(managerForeignKeyNames).doesNotContain(employeeForeignKeyName);
+                }
+        );
+    }
+
+    @Entity(name = "Employee")
+    @Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
+    static class Employee implements Serializable {
+
+        @Id
+        @GeneratedValue
+        Long id;
+
+        @OneToOne(cascade = CascadeType.ALL, orphanRemoval = true)
+        private Address address;
+
+    }
+
+    @Entity(name = "Manager")
+    static class Manager extends Employee {
+
+        @OneToOne(fetch = FetchType.EAGER, orphanRemoval = true, cascade = CascadeType.ALL)
+        private Territory territory;
+    }
+
+    @Entity(name = "Address")
+    static class Address {
+
+        @Id
+        @GeneratedValue
+        Long id;
+
+        @Column(nullable = false, columnDefinition = "TEXT")
+        private String address = "";
+    }
+
+    @Entity(name = "Territory")
+    static class Territory {
+
+        @Id
+        @GeneratedValue
+        Long id;
+
+        @Column
+        private String location = "";
+    }
+
+}