Re: Cube extension point support // GSoC'13

2. I didn't understand this change:

@@ -422,24 +439,14 @@ g_cube_union(PG_FUNCTION_ARGS)
 Datum
 g_cube_compress(PG_FUNCTION_ARGS)
 {
-       PG_RETURN_DATUM(PG_GETARG_DATUM(0));
+       GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
+       PG_RETURN_POINTER(entry);
 }

 Datum
 g_cube_decompress(PG_FUNCTION_ARGS)
 {
        GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
-       NDBOX      *key = DatumGetNDBOX(PG_DETOAST_DATUM(entry->key));
-
-       if (key != DatumGetNDBOX(entry->key))
-       {
-               GISTENTRY  *retval = (GISTENTRY *) palloc(sizeof(GISTENTRY));
-
-               gistentryinit(*retval, PointerGetDatum(key),
-                                         entry->rel, entry->page,
-                                         entry->offset, FALSE);
-               PG_RETURN_POINTER(retval);
-       }
        PG_RETURN_POINTER(entry);
 }

What did the removed code do, and why isn't it needed anymore?