Merged with mysql-5.1 tree.

client/mysqltest.cc:
  Manually merged
configure.in:
  Manually merged
mysql-test/r/variables.result:
  Manually merged
mysql-test/t/variables.test:
  Manually merged
mysys/my_pread.c:
  Manually merged
mysys/my_read.c:
  Manually merged
sql/mysqld.cc:
  Manually merged
storage/csv/ha_tina.h:
  Manually merged
storage/myisam/ha_myisam.cc:
  Manually merged
storage/myisam/mi_check.c:
  Manually merged
storage/myisam/mi_search.c:
  Manually merged

1 files changed, 7 insertions, 1 deletions

diff --git a/sql/sql_class.h b/sql/sql_class.h
index 16956e07274..3183699fcd0 100644
--- a/sql/sql_class.h
+++ b/sql/sql_class.h
@@ -323,6 +323,8 @@ struct system_variables
   ulong net_write_timeout;
   ulong optimizer_prune_level;
   ulong optimizer_search_depth;
+  /* A bitmap for switching optimizations on/off */
+  ulong optimizer_switch;
   ulong preload_buff_size;
   ulong profiling_history_size;
   ulong query_cache_type;
@@ -670,7 +672,7 @@ public:
   */
 
   char *db;
-  uint db_length;
+  size_t db_length;
 
 public:
 
@@ -817,6 +819,7 @@ public:
   void
   restore_security_context(THD *thd, Security_context *backup);
 #endif
+  bool user_matches(Security_context *);
 };
 
 
@@ -1782,6 +1785,9 @@ public:
   sp_cache   *sp_proc_cache;
   sp_cache   *sp_func_cache;
 
+  /** number of name_const() substitutions, see sp_head.cc:subst_spvars() */
+  uint       query_name_consts;
+
   /*
     If we do a purge of binary logs, log index info of the threads
     that are currently reading it needs to be adjusted. To do that