Rewritten patch of percona - switching query cache on and off, removing comments.

client/mysqltest.cc:
  Column names.
mysql-test/r/grant_cache_no_prot.result:
  fix of text.
mysql-test/r/grant_cache_ps_prot.result:
  Fix of test.
mysql-test/r/query_cache.result:
  Switching on and off query cache.
mysql-test/t/query_cache.test:
  Switching on and off query cache.
mysys/charset.c:
  Fix of parser.
sql/handler.cc:
  thd added to parameters.
sql/log_event.cc:
  thd added to parameters.
sql/log_event_old.cc:
  thd added to parameters.
sql/mysql_priv.h:
  Fixed functions definitions.
sql/mysqld.cc:
  Comments stripping.
sql/set_var.cc:
  Switching on and off query cache.
sql/set_var.h:
  Switching on and off query cache.
sql/share/errmsg.txt:
  New errors.
sql/sql_cache.cc:
  Switching query cache on and off, removing comments.
sql/sql_cache.h:
  thd added to parameters.
sql/sql_class.h:
  Comments stripping.
sql/sql_db.cc:
  thd added to parameters.
sql/sql_lex.cc:
  lex fixed.
sql/sql_parse.cc:
  thd added to parameters.

1 files changed, 9 insertions, 4 deletions

diff --git a/sql/set_var.h b/sql/set_var.h
index 95885357b83..d2bb1e94d33 100644
--- a/sql/set_var.h
+++ b/sql/set_var.h
@@ -516,10 +516,15 @@ public:
   { chain_sys_var(chain); }
   bool check(THD *thd, set_var *var)
   {
-    int ret= 0;
-    if (check_func)
-      ret= (*check_func)(thd, var);
-    return ret ? ret : check_enum(thd, var, enum_names);
+    /*
+      check_enum fails if the character representation supplied was wrong
+      or that the integer value was wrong or missing.
+    */
+    if (check_enum(thd, var, enum_names))
+      return TRUE;
+    if ((check_func && (*check_func)(thd, var)))
+      return TRUE;
+    return FALSE;
   }
   bool update(THD *thd, set_var *var);
   void set_default(THD *thd, enum_var_type type);