HHH-9369 Fix @Formula of enum type results in ClassCastException

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

@@ -494,7 +494,10 @@ public class SimpleValue implements KeyValue {
 		try {
 			String[] columnsNames = new String[columns.size()];
 			for ( int i = 0; i < columns.size(); i++ ) {
-				columnsNames[i] = ( (Column) columns.get( i ) ).getName();
+				Selectable column = columns.get(i);
+				if (column instanceof Column){
+					columnsNames[i] = ((Column) column).getName();
+				}
 			}
 
 			final XProperty xProperty = (XProperty) typeParameters.get( DynamicParameterizedType.XPROPERTY );

hibernate-core/src/test/java/org/hibernate/test/annotations/enumerated/EntityEnum.java

@@ -7,6 +7,7 @@ import javax.persistence.Enumerated;
 import javax.persistence.GeneratedValue;
 import javax.persistence.Id;
 
+import org.hibernate.annotations.Formula;
 import org.hibernate.annotations.Type;
 import org.hibernate.annotations.TypeDef;
 import org.hibernate.annotations.TypeDefs;
@@ -54,6 +55,10 @@ public class EntityEnum {
 	@Enumerated(EnumType.STRING)
 	private Trimmed trimmed;
 
+	@Formula("(select 'A' from dual)")
+	@Enumerated(EnumType.STRING)
+	private Trimmed formula;
+
 	public long getId() {
 		return id;
 	}
@@ -109,4 +114,12 @@ public class EntityEnum {
 	public void setTrimmed(Trimmed trimmed) {
 		this.trimmed = trimmed;
 	}
+
+	public Trimmed getFormula() {
+		return formula;
+	}
+
+	public void setFormula(Trimmed formula) {
+		this.formula = formula;
+	}
 }

hibernate-core/src/test/java/org/hibernate/test/annotations/enumerated/EnumeratedTypeTest.java

@@ -397,6 +397,28 @@ public class EnumeratedTypeTest extends BaseCoreFunctionalTestCase {
         s.close();
 	}
 
+	@Test
+	@TestForIssue(jiraKey = "HHH-9369")
+	public void testFormula() throws SQLException {
+		// use native SQL to insert, forcing whitespace to occur
+		final Session s = openSession();
+		final Connection connection = ((SessionImplementor)s).connection();
+		final Statement statement = connection.createStatement();
+		statement.execute("insert into EntityEnum (id) values(1)");
+
+		s.getTransaction().begin();
+
+		// ensure EnumType can do #fromName with the trimming
+		List<EntityEnum> resultList = s.createQuery("select e from EntityEnum e").list();
+		assertEquals( resultList.size(), 1 );
+		assertEquals( resultList.get(0).getFormula(), Trimmed.A );
+
+		statement.execute( "delete from EntityEnum" );
+
+		s.getTransaction().commit();
+		s.close();
+	}
+
 	@Override
 	protected Class[] getAnnotatedClasses() {
 		return new Class[] { EntityEnum.class };