preserve stored FRM in ARZ across OPTIMIZE TABLE.
  
filed as http://bugs.mysql.com/bug.php?id=45377

---
 storage/archive/ha_archive.cc |   18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

Index: mysql-5.1/storage/archive/ha_archive.cc
===================================================================
--- mysql-5.1.orig/storage/archive/ha_archive.cc	2009-06-23 14:47:17.296582502 +1000
+++ mysql-5.1/storage/archive/ha_archive.cc	2009-07-21 00:12:51.438625713 +1000
@@ -1285,12 +1285,25 @@ int ha_archive::optimize(THD* thd, HA_CH
     share->archive_write_open= FALSE;
   }
 
+  char* frm_string;
+  frm_string= (char*)malloc(sizeof(char) * archive.frm_length);
+  if (!frm_string)
+  {
+    return ENOMEM;
+  }
+  azread_frm(&archive, frm_string);
+
   /* Lets create a file to contain the new data */
   fn_format(writer_filename, share->table_name, "", ARN, 
             MY_REPLACE_EXT | MY_UNPACK_FILENAME);
 
   if (!(azopen(&writer, writer_filename, O_CREAT|O_RDWR|O_BINARY)))
-    DBUG_RETURN(HA_ERR_CRASHED_ON_USAGE); 
+  {
+    free(frm_string);
+    DBUG_RETURN(HA_ERR_CRASHED_ON_USAGE);
+  }
+
+  azwrite_frm(&writer, frm_string, archive.frm_length);
 
   /* 
     An extended rebuild is a lot more effort. We open up each row and re-record it. 
@@ -1361,9 +1374,10 @@ int ha_archive::optimize(THD* thd, HA_CH
   // make the file we just wrote be our data file
   rc = my_rename(writer_filename,share->data_file_name,MYF(0));
 
-
+  free(frm_string);
   DBUG_RETURN(rc);
 error:
+  free(frm_string);
   DBUG_PRINT("ha_archive", ("Failed to recover, error was %d", rc));
   azclose(&writer);