Manual merge from mysql-5.5-bugteam.

1 files changed, 10 insertions, 7 deletions

diff --git a/sql/sql_show.cc b/sql/sql_show.cc
index dfb95583d9d..69f2ff240c2 100644
--- a/sql/sql_show.cc
+++ b/sql/sql_show.cc
@@ -673,7 +673,7 @@ mysqld_show_create(THD *thd, TABLE_LIST *table_list)
     Metadata locks taken during SHOW CREATE should be released when
     the statmement completes as it is an information statement.
   */
-  MDL_ticket *mdl_savepoint= thd->mdl_context.mdl_savepoint();
+  MDL_savepoint mdl_savepoint= thd->mdl_context.mdl_savepoint();
 
   /* We want to preserve the tree for views. */
   thd->lex->view_prepare_mode= TRUE;
@@ -1736,7 +1736,7 @@ public:
   time_t start_time;
   uint   command;
   const char *user,*host,*db,*proc_info,*state_info;
-  char *query;
+  CSET_STRING query_string;
 };
 
 #ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION
@@ -1833,12 +1833,14 @@ void mysqld_list_processes(THD *thd,const char *user, bool verbose)
         if (mysys_var)
           mysql_mutex_unlock(&mysys_var->mutex);
 
-        thd_info->query=0;
         /* Lock THD mutex that protects its data when looking at it. */
         if (tmp->query())
         {
           uint length= min(max_query_length, tmp->query_length());
-          thd_info->query= (char*) thd->strmake(tmp->query(),length);
+          char *q= thd->strmake(tmp->query(),length);
+          /* Safety: in case strmake failed, we set length to 0. */
+          thd_info->query_string=
+            CSET_STRING(q, q ? length : 0, tmp->query_charset());
         }
         mysql_mutex_unlock(&tmp->LOCK_thd_data);
         thd_info->start_time= tmp->start_time;
@@ -1866,7 +1868,8 @@ void mysqld_list_processes(THD *thd,const char *user, bool verbose)
     else
       protocol->store_null();
     protocol->store(thd_info->state_info, system_charset_info);
-    protocol->store(thd_info->query, system_charset_info);
+    protocol->store(thd_info->query_string.str(),
+                    thd_info->query_string.charset());
     if (protocol->write())
       break; /* purecov: inspected */
   }
@@ -3195,7 +3198,7 @@ try_acquire_high_prio_shared_mdl_lock(THD *thd, TABLE_LIST *table,
 {
   bool error;
   table->mdl_request.init(MDL_key::TABLE, table->db, table->table_name,
-                          MDL_SHARED_HIGH_PRIO);
+                          MDL_SHARED_HIGH_PRIO, MDL_TRANSACTION);
 
   if (can_deadlock)
   {
@@ -7754,7 +7757,7 @@ bool show_create_trigger(THD *thd, const sp_name *trg_name)
     Metadata locks taken during SHOW CREATE TRIGGER should be released when
     the statement completes as it is an information statement.
   */
-  MDL_ticket *mdl_savepoint= thd->mdl_context.mdl_savepoint();
+  MDL_savepoint mdl_savepoint= thd->mdl_context.mdl_savepoint();
 
   /*
     Open the table by name in order to load Table_triggers_list object.