don't check record's checksum in REPAIR

myisam/mi_dynrec.c:
  new parameter for _mi_rec_check().
myisam/myisamdef.h:
  new parameter for _mi_rec_check().

myisam/mi_check.c

@@ -971,7 +971,8 @@ int chk_data_link(MI_CHECK *param, MI_INFO *info,int extend)
 	  info->checksum=mi_checksum(info,record);
 	  if (param->testflag & (T_EXTEND | T_MEDIUM | T_VERBOSE))
 	  {
-	    if (_mi_rec_check(info,record, info->rec_buff,block_info.rec_len))
+	    if (_mi_rec_check(info,record, info->rec_buff,block_info.rec_len,
+                              test(info->s->calc_checksum)))
 	    {
 	      mi_check_print_error(param,"Found wrong packed record at %s",
 			  llstr(start_recpos,llbuff));
@@ -3024,7 +3025,9 @@ static int sort_get_next_record(MI_SORT_PARAM *sort_param)
 	if ((param->testflag & (T_EXTEND | T_REP)) || searching)
 	{
 	  if (_mi_rec_check(info, sort_param->record, sort_param->rec_buff,
-                            sort_param->find_length))
+                            sort_param->find_length,
+                            (param->testflag & T_QUICK) &&
+                            test(info->s->calc_checksum)))
 	  {
 	    mi_check_print_info(param,"Found wrong packed record at %s",
 				llstr(sort_param->start_recpos,llbuff));

myisam/mi_dynrec.c

@@ -806,7 +806,7 @@ uint _mi_rec_pack(MI_INFO *info, register byte *to, register const byte *from)
 */
 
 my_bool _mi_rec_check(MI_INFO *info,const char *record, byte *rec_buff,
-                      ulong packed_length)
+                      ulong packed_length, my_bool with_checksum)
 {
   uint		length,new_length,flag,bit,i;
   char		*pos,*end,*packpos,*to;
@@ -901,13 +901,10 @@ my_bool _mi_rec_check(MI_INFO *info,const char *record, byte *rec_buff,
   if (packed_length != (uint) (to - rec_buff) + test(info->s->calc_checksum) ||
       (bit != 1 && (flag & ~(bit - 1))))
     goto err;
-  if (info->s->calc_checksum)
+  if (with_checksum && ((uchar) info->checksum != (uchar) *to))
   {
-    if ((uchar) info->checksum != (uchar) *to)
-    {
-      DBUG_PRINT("error",("wrong checksum for row"));
-      goto err;
-    }
+    DBUG_PRINT("error",("wrong checksum for row"));
+    goto err;
   }
   DBUG_RETURN(0);
 

myisam/myisamdef.h

@@ -582,7 +582,7 @@ extern byte *mi_alloc_rec_buff(MI_INFO *,ulong, byte**);
 extern ulong _mi_rec_unpack(MI_INFO *info,byte *to,byte *from,
 			    ulong reclength);
 extern my_bool _mi_rec_check(MI_INFO *info,const char *record, byte *packpos,
-                             ulong reclength);
+                             ulong packed_length, my_bool with_checkum);
 extern int _mi_write_part_record(MI_INFO *info,my_off_t filepos,ulong length,
 				 my_off_t next_filepos,byte **record,
 				 ulong *reclength,int *flag);