MDEV-5736 remove what remains from ONE_SHOT hack

client/mysql.cc

@@ -606,7 +606,6 @@ static COMMANDS commands[] = {
   { "OLD_PASSWORD", 0, 0, 0, ""},
   { "ON", 0, 0, 0, ""},
   { "ONE", 0, 0, 0, ""},
-  { "ONE_SHOT", 0, 0, 0, ""},
   { "OPEN", 0, 0, 0, ""},
   { "OPTIMIZE", 0, 0, 0, ""},
   { "OPTION", 0, 0, 0, ""},

sql/log_event.cc

@@ -4471,17 +4471,6 @@ end:
 
 int Query_log_event::do_update_pos(rpl_group_info *rgi)
 {
-  /*
-    Note that we will not increment group* positions if we are just
-    after a SET ONE_SHOT, because SET ONE_SHOT should not be separated
-    from its following updating query.
-  */
-  if (thd->one_shot_set)
-  {
-    rgi->inc_event_relay_log_pos();
-    return 0;
-  }
-  else
   return Log_event::do_update_pos(rgi);
 }
 

sql/sql_class.cc

@@ -956,7 +956,6 @@ THD::THD()
   connection_name.length= 0;
 
   bzero(&variables, sizeof(variables));
-  one_shot_set= 0;
   file_id = 0;
   query_id= 0;
   query_name_consts= 0;

sql/sql_class.h

@@ -2592,7 +2592,7 @@ public:
   char       default_master_connection_buff[MAX_CONNECTION_NAME+1];
   uint8      password; /* 0, 1 or 2 */
   uint8      failed_com_change_user;
-  bool       slave_thread, one_shot_set;
+  bool       slave_thread;
   bool       extra_port;                        /* If extra connection */
 
   bool	     no_errors;

sql/sql_lex.h

@@ -2468,7 +2468,7 @@ struct LEX: public Query_tables_list
   uint16 create_view_algorithm;
   uint8 create_view_check;
   uint8 context_analysis_only;
-  bool drop_temporary, local_file, one_shot_set;
+  bool drop_temporary, local_file;
   bool check_exists;
   bool autocommit;
   bool verbose, no_write_to_binlog;

sql/sql_parse.cc

@@ -2031,23 +2031,6 @@ bool alloc_query(THD *thd, const char *packet, uint packet_length)
   return FALSE;
 }
 
-static void reset_one_shot_variables(THD *thd) 
-{
-  thd->variables.character_set_client=
-    global_system_variables.character_set_client;
-  thd->variables.collation_connection=
-    global_system_variables.collation_connection;
-  thd->variables.collation_database=
-    global_system_variables.collation_database;
-  thd->variables.collation_server=
-    global_system_variables.collation_server;
-  thd->update_charset();
-  thd->variables.time_zone=
-    global_system_variables.time_zone;
-  thd->variables.lc_time_names= &my_locale_en_US;
-  thd->one_shot_set= 0;
-}
-
 
 bool sp_process_definer(THD *thd)
 {
@@ -2348,9 +2331,6 @@ mysql_execute_command(THD *thd)
       {
         /* we warn the slave SQL thread */
         my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
-        if (thd->one_shot_set)
-          reset_one_shot_variables(thd);
-        DBUG_RETURN(0);
       }
       
       for (table=all_tables; table; table=table->next_global)
@@ -2378,23 +2358,6 @@ mysql_execute_command(THD *thd)
     {
       /* we warn the slave SQL thread */
       my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
-      if (thd->one_shot_set)
-      {
-        /*
-          It's ok to check thd->one_shot_set here:
-
-          The charsets in a MySQL 5.0 slave can change by both a binlogged
-          SET ONE_SHOT statement and the event-internal charset setting, 
-          and these two ways to change charsets do not seems to work
-          together.
-
-          At least there seems to be problems in the rli cache for
-          charsets if we are using ONE_SHOT.  Note that this is normally no
-          problem because either the >= 5.0 slave reads a 4.1 binlog (with
-          ONE_SHOT) *or* or 5.0 binlog (without ONE_SHOT) but never both."
-        */
-        reset_one_shot_variables(thd);
-      }
       DBUG_RETURN(0);
     }
     /* 
@@ -3782,11 +3745,6 @@ end_with_restore_list:
       goto error;
     if (!(res= sql_set_variables(thd, lex_var_list)))
     {
-      /*
-        If the previous command was a SET ONE_SHOT, we don't want to forget
-        about the ONE_SHOT property of that SET. So we use a |= instead of = .
-      */
-      thd->one_shot_set|= lex->one_shot_set;
       my_ok(thd);
     }
     else
@@ -5132,19 +5090,6 @@ create_sp_error:
   THD_STAGE_INFO(thd, stage_query_end);
   thd->update_stats();
 
-  /*
-    Binlog-related cleanup:
-    Reset system variables temporarily modified by SET ONE SHOT.
-
-    Exception: If this is a SET, do nothing. This is to allow
-    mysqlbinlog to print many SET commands (in this case we want the
-    charset temp setting to live until the real query). This is also
-    needed so that SET CHARACTER_SET_CLIENT... does not cancel itself
-    immediately.
-  */
-  if (thd->one_shot_set && lex->sql_command != SQLCOM_SET_OPTION)
-    reset_one_shot_variables(thd);
-
   goto finish;
 
 error:

sql/sql_yacc.yy

@@ -810,7 +810,6 @@ static void sp_create_assignment_lex(THD *thd, bool no_lookahead)
     lex->sql_command= SQLCOM_SET_OPTION;
     mysql_init_select(lex);
     lex->var_list.empty();
-    lex->one_shot_set= 0;
     lex->autocommit= 0;
     /* get_ptr() is only correct with no lookahead. */
     DBUG_ASSERT(no_lookahead);
@@ -14424,7 +14423,6 @@ set:
             mysql_init_select(lex);
             lex->option_type=OPT_SESSION;
             lex->var_list.empty();
-            lex->one_shot_set= 0;
             lex->autocommit= 0;
             sp_create_assignment_lex(thd, yychar == YYEMPTY);
           }