Post-review fixes: rename SHOW_DOUBLE to SHOW_DOUBLE_STATUS

sql/mysqld.cc

@@ -5713,7 +5713,7 @@ struct show_var_st status_vars[]= {
   {"Key_reads",                (char*) &dflt_key_cache_var.global_cache_read, SHOW_KEY_CACHE_LONG},
   {"Key_write_requests",       (char*) &dflt_key_cache_var.global_cache_w_requests, SHOW_KEY_CACHE_LONG},
   {"Key_writes",               (char*) &dflt_key_cache_var.global_cache_write, SHOW_KEY_CACHE_LONG},
-  {"Last_query_cost",          (char*) offsetof(STATUS_VAR, last_query_cost), SHOW_DOUBLE},
+  {"Last_query_cost",          (char*) offsetof(STATUS_VAR, last_query_cost), SHOW_DOUBLE_STATUS},
   {"Max_used_connections",     (char*) &max_used_connections,  SHOW_LONG},
 #ifdef HAVE_NDBCLUSTER_DB
   {"Ndb_",                     (char*) &ndb_status_variables,   SHOW_VARS},

sql/sql_show.cc

@@ -1356,7 +1356,7 @@ static bool show_status_array(THD *thd, const char *wild,
           end= strend(pos);
           break;
         }
-        case SHOW_DOUBLE:
+        case SHOW_DOUBLE_STATUS:
         {
           value= ((char *) status_var + (ulong) value);
           end= buff + sprintf(buff, "%f", *(double*) value);

sql/structs.h

@@ -164,7 +164,8 @@ typedef struct st_known_date_time_format {
 enum SHOW_TYPE
 {
   SHOW_UNDEF,
-  SHOW_LONG, SHOW_LONGLONG, SHOW_INT, SHOW_CHAR, SHOW_CHAR_PTR, SHOW_DOUBLE,
+  SHOW_LONG, SHOW_LONGLONG, SHOW_INT, SHOW_CHAR, SHOW_CHAR_PTR, 
+  SHOW_DOUBLE_STATUS,
   SHOW_BOOL, SHOW_MY_BOOL, SHOW_OPENTABLES, SHOW_STARTTIME, SHOW_QUESTION,
   SHOW_LONG_CONST, SHOW_INT_CONST, SHOW_HAVE, SHOW_SYS, SHOW_HA_ROWS,
   SHOW_VARS,