Fixed length rows should not use row checksum in MyISAM tables

Fixed bug in handling of packed MyISAM keys

myisam/mi_create.c

@@ -164,6 +164,9 @@ int mi_create(const char *name,uint keys,MI_KEYDEF *keydefs,
 
   if (packed || (flags & HA_PACK_RECORD))
     options|=HA_OPTION_PACK_RECORD;	/* Must use packed records */
+  /* We can't use checksum with static length rows */
+  if (!(options & HA_OPTION_PACK_RECORD))
+    options&= ~HA_OPTION_CHECKSUM;
   if (options & (HA_OPTION_PACK_RECORD | HA_OPTION_COMPRESS_RECORD))
     min_pack_length+=varchar_count;		/* Min length to pack */
   else
@@ -445,7 +448,7 @@ int mi_create(const char *name,uint keys,MI_KEYDEF *keydefs,
   share.base.records=ci->max_rows;
   share.base.reloc=  ci->reloc_rows;
   share.base.reclength=real_reclength;
-  share.base.pack_reclength=reclength+ test(options & HA_OPTION_CHECKSUM);;
+  share.base.pack_reclength=reclength+ test(options & HA_OPTION_CHECKSUM);
   share.base.max_pack_length=pack_reclength;
   share.base.min_pack_length=min_pack_length;
   share.base.pack_bits=packed;

myisam/mi_search.c

@@ -417,7 +417,7 @@ int _mi_prefix_search(MI_INFO *info, register MI_KEYDEF *keyinfo, uchar *page,
         }
         else if (len > cmplen)
         {
-          if ((my_flag= (!(nextflag & SEARCH_PREFIX) && key_len_left>0)))
+          if ((my_flag= (!(nextflag & SEARCH_PREFIX) || key_len_left>0)))
             break;
           goto fix_flag;
         }

myisam/mi_statrec.c

@@ -73,7 +73,7 @@ int _mi_write_static_record(MI_INFO *info, const byte *record)
 	bzero((char*) temp,length);
 	if (my_pwrite(info->dfile, (byte*) temp,length,
 		      info->state->data_file_length+
-		      info->s->base.pack_reclength,
+		      info->s->base.reclength,
 		      info->s->write_flag))
 	  goto err;
       }