Remove unused thd->options's flag -- OPTION_UPDATE_LOG

The update log itself was removed back in 5.0. Recommit
with post-review fixes.

sql/log.cc

@@ -714,7 +714,8 @@ bool LOGGER::slow_log_print(THD *thd, const char *query, uint query_length,
   {
     current_time= time(NULL);
 
-    if (!(thd->options & OPTION_UPDATE_LOG))
+    /* do not log slow queries from replication threads */
+    if (thd->slave_thread)
       return 0;
 
     lock();

sql/mysql_priv.h

@@ -259,7 +259,7 @@ extern CHARSET_INFO *national_charset_info, *table_alias_charset;
 #define OPTION_BIG_TABLES       (LL(1) << 8)       // THD, user
 #define OPTION_BIG_SELECTS      (LL(1) << 9)       // THD, user
 #define OPTION_LOG_OFF          (LL(1) << 10)      // THD, user
-#define OPTION_UPDATE_LOG       (LL(1) << 11)      // THD, user, unused
+#define OPTION_QUOTE_SHOW_CREATE (LL(1) << 11)     // THD, user
 #define TMP_TABLE_ALL_COLUMNS   (LL(1) << 12)      // SELECT, intern
 #define OPTION_WARNINGS         (LL(1) << 13)      // THD, user
 #define OPTION_AUTO_IS_NULL     (LL(1) << 14)      // THD, user, binlog
@@ -271,7 +271,6 @@ extern CHARSET_INFO *national_charset_info, *table_alias_charset;
 #define OPTION_BEGIN            (LL(1) << 20)      // THD, intern
 #define OPTION_TABLE_LOCK       (LL(1) << 21)      // THD, intern
 #define OPTION_QUICK            (LL(1) << 22)      // SELECT (for DELETE)
-#define OPTION_QUOTE_SHOW_CREATE (LL(1) << 23)     // THD, user
 
 /* Thr following is used to detect a conflict with DISTINCT
    in the user query has requested */

sql/mysqld.cc

@@ -6982,9 +6982,8 @@ static void mysql_init_variables(void)
   log_error_file_ptr= log_error_file;
   language_ptr= language;
   mysql_data_home= mysql_real_data_home;
-  thd_startup_options= (OPTION_UPDATE_LOG | OPTION_AUTO_IS_NULL |
-			OPTION_BIN_LOG | OPTION_QUOTE_SHOW_CREATE |
-			OPTION_SQL_NOTES);
+  thd_startup_options= (OPTION_AUTO_IS_NULL | OPTION_BIN_LOG |
+                        OPTION_QUOTE_SHOW_CREATE | OPTION_SQL_NOTES);
   protocol_version= PROTOCOL_VERSION;
   what_to_log= ~ (1L << (uint) COM_TIME);
   refresh_version= flush_version= 1L;	/* Increments on each reload */

sql/set_var.cc

@@ -22,9 +22,6 @@
   - Use one of the 'sys_var... classes from set_var.h or write a specific
     one for the variable type.
   - Define it in the 'variable definition list' in this file.
-  - If the variable should be changeable or one should be able to access it
-    with @@variable_name, it should be added to the 'list of all variables'
-    list (sys_variables) in this file.
   - If the variable is thread specific, add it to 'system_variables' struct.
     If not, add it to mysqld.cc and an declaration in 'mysql_priv.h'
   - If the variable should be changed from the command line, add a definition
@@ -140,7 +137,6 @@ static bool set_option_autocommit(THD *thd, set_var *var);
 static int  check_log_update(THD *thd, set_var *var);
 static bool set_log_update(THD *thd, set_var *var);
 static int  check_pseudo_thread_id(THD *thd, set_var *var);
-static bool set_log_bin(THD *thd, set_var *var);
 void fix_binlog_format_after_update(THD *thd, enum_var_type type);
 static void fix_low_priority_updates(THD *thd, enum_var_type type);
 static int check_tx_isolation(THD *thd, set_var *var);
@@ -170,7 +166,10 @@ static byte *get_warning_count(THD *thd);
   Variable definition list
 
   These are variables that can be set from the command line, in
-  alphabetic order
+  alphabetic order.
+
+  The variables are linked into the list. A variable is added to
+  it in the constructor (see sys_var class for details).
 */
 
 sys_var *sys_var::first= NULL;
@@ -557,10 +556,10 @@ static sys_var_thd_bit	sys_log_off("sql_log_off", 0,
 static sys_var_thd_bit	sys_log_update("sql_log_update",
                                        check_log_update,
 				       set_log_update,
-				       OPTION_UPDATE_LOG);
+				       OPTION_BIN_LOG);
 static sys_var_thd_bit	sys_log_binlog("sql_log_bin",
                                        check_log_update,
-				       set_log_bin,
+				       set_option_bit,
 				       OPTION_BIN_LOG);
 static sys_var_thd_bit	sys_sql_warnings("sql_warnings", 0,
 					 set_option_bit,
@@ -2778,8 +2777,6 @@ static bool set_log_update(THD *thd, set_var *var)
 
   if (opt_sql_bin_update)
   {
-    ((sys_var_thd_bit*) var->var)->bit_flag|= (OPTION_BIN_LOG |
-					       OPTION_UPDATE_LOG);
     push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
                  ER_UPDATE_LOG_DEPRECATED_TRANSLATED,
                  ER(ER_UPDATE_LOG_DEPRECATED_TRANSLATED));
@@ -2792,14 +2789,6 @@ static bool set_log_update(THD *thd, set_var *var)
   return 0;
 }
 
-static bool set_log_bin(THD *thd, set_var *var)
-{
-  if (opt_sql_bin_update)
-    ((sys_var_thd_bit*) var->var)->bit_flag|= (OPTION_BIN_LOG |
-					       OPTION_UPDATE_LOG);
-  set_option_bit(thd, var);
-  return 0;
-}
 
 static int check_pseudo_thread_id(THD *thd, set_var *var)
 {