Correct view of sort.c and mi_too_big_key_for_sort()

myisam/mi_check.c:
  Correct mi_too_big_key_for_sort()
myisam/sort.c:
  Correct view, according rules

myisam/mi_check.c

@@ -3682,10 +3682,7 @@ static my_bool mi_too_big_key_for_sort(MI_KEYDEF *key, ha_rows rows)
     key_maxlength+=ft_max_word_len_for_sort-HA_FT_MAXLEN;
   return (key->flag & (HA_BINARY_PACK_KEY | HA_VAR_LENGTH_KEY | HA_FULLTEXT) &&
 	  ((ulonglong) rows * key_maxlength >
-	   (ulonglong) myisam_max_temp_length ||
-	   (ulonglong) rows * (key_maxlength - key->minlength) / 2 >
-	   myisam_max_extra_temp_length ||
-	   (rows == 0 && (key_maxlength / key->minlength) > 2)));
+	   (ulonglong) myisam_max_temp_length));
 }
 
 

myisam/sort.c

@@ -73,13 +73,14 @@ static int NEAR_F merge_index(MI_SORT_PARAM *,uint,uchar **,BUFFPEK *, int,
                               IO_CACHE *);
 			      
 static int NEAR_F write_keys_varlen(MI_SORT_PARAM *info,uchar **sort_keys,
-                                    uint count, BUFFPEK *buffpek,IO_CACHE *tempfile);
+                                    uint count, BUFFPEK *buffpek,
+                                    IO_CACHE *tempfile);
 static uint NEAR_F read_to_buffer_varlen(IO_CACHE *fromfile,BUFFPEK *buffpek,
                                          uint sort_length);
-static int NEAR_F write_merge_key(MI_SORT_PARAM *info, IO_CACHE *to_file,char* key,
-                                  uint sort_length, uint count);
-static int NEAR_F write_merge_key_varlen(MI_SORT_PARAM *info, IO_CACHE *to_file,char* key,
-                                         uint sort_length, uint count);
+static int NEAR_F write_merge_key(MI_SORT_PARAM *info, IO_CACHE *to_file,
+                                  char* key, uint sort_length, uint count);
+static int NEAR_F write_merge_key_varlen(MI_SORT_PARAM *info, IO_CACHE *to_file,
+                                       char* key, uint sort_length, uint count);
 inline int my_var_write(MI_SORT_PARAM *info,IO_CACHE *to_file,char *bufs);
 /*
   Creates a index of sorted keys