HHH-11237 - Fix isModified so that a null equates empty components when using select-before-update.

Author: Naros

hibernate-core/src/main/java/org/hibernate/type/ComponentType.java

@@ -299,19 +299,16 @@ public boolean isModified(
 			final Object current,
 			final boolean[] checkable,
 			final SharedSessionContractImplementor session) throws HibernateException {
-		if ( current == null ) {
-			return old != null;
-		}
-		if ( old == null ) {
-			return true;
+		if ( old == current ) {
+			return false;
 		}
-		Object[] oldValues = (Object[]) old;
+		// null value and empty components are considered equivalent
 		int loc = 0;
 		for ( int i = 0; i < propertySpan; i++ ) {
 			int len = propertyTypes[i].getColumnSpan( session.getFactory() );
 			boolean[] subcheckable = new boolean[len];
 			System.arraycopy( checkable, loc, subcheckable, 0, len );
-			if ( propertyTypes[i].isModified( oldValues[i], getPropertyValue( current, i ), subcheckable, session ) ) {
+			if ( propertyTypes[i].isModified( getPropertyValue( old, i ), getPropertyValue( current, i ), subcheckable, session ) ) {
 				return true;
 			}
 			loc += len;