Set thd->query() for internal (startup) transactions

This helps with debugging as 'Query: ' in DBUG traces will show something
useful, for internal transactions, instead of just "".

sql/ddl_log.cc

@@ -2741,6 +2741,8 @@ int ddl_log_execute_recovery()
   thd->thread_stack= (char*) &thd;
   thd->store_globals();
   thd->init();                                  // Needed for error messages
+  thd->set_query_inner((char*) STRING_WITH_LEN("intern:ddl_log_execute_recovery"),
+                       default_charset_info);
 
   thd->log_all_errors= (global_system_variables.log_warnings >= 3);
   recovery_state.drop_table.free();

sql/events.cc

@@ -906,6 +906,8 @@ Events::init(THD *thd, bool opt_noacl_or_bootstrap)
     */
     thd->thread_stack= (char*) &thd;
     thd->store_globals();
+    thd->set_query_inner((char*) STRING_WITH_LEN("intern:Events::init"),
+                         default_charset_info);
     /*
       Set current time for the thread that handles events.
       Current time is stored in data member start_time of THD class.

sql/sql_acl.cc

@@ -2533,6 +2533,8 @@ bool acl_init(bool dont_read_acl_tables)
     DBUG_RETURN(1); /* purecov: inspected */
   thd->thread_stack= (char*) &thd;
   thd->store_globals();
+  thd->set_query_inner((char*) STRING_WITH_LEN("intern:acl_init"),
+                       default_charset_info);
   /*
     It is safe to call acl_reload() since acl_* arrays and hashes which
     will be freed there are global static objects and thus are initialized
@@ -8001,6 +8003,9 @@ bool grant_init()
     DBUG_RETURN(1);				/* purecov: deadcode */
   thd->thread_stack= (char*) &thd;
   thd->store_globals();
+  thd->set_query_inner((char*) STRING_WITH_LEN("intern:grant_init"),
+                       default_charset_info);
+
   return_val=  grant_reload(thd);
   delete thd;
   DBUG_RETURN(return_val);

sql/sql_plugin.cc

@@ -1830,6 +1830,7 @@ static bool register_builtin(struct st_maria_plugin *plugin,
 /*
   called only by plugin_init()
 */
+
 static void plugin_load(MEM_ROOT *tmp_root)
 {
   TABLE_LIST tables;
@@ -1847,6 +1848,8 @@ static void plugin_load(MEM_ROOT *tmp_root)
 
   new_thd->thread_stack= (char*) &tables;
   new_thd->store_globals();
+  new_thd->set_query_inner((char*) STRING_WITH_LEN("intern:plugin_load"),
+                           default_charset_info);
   new_thd->db= MYSQL_SCHEMA_NAME;
   bzero((char*) &new_thd->net, sizeof(new_thd->net));
   tables.init_one_table(&MYSQL_SCHEMA_NAME, &MYSQL_PLUGIN_NAME, 0, TL_READ);

sql/sql_reload.cc

@@ -83,6 +83,8 @@ bool reload_acl_and_cache(THD *thd, unsigned long long options,
     {
       thd->thread_stack= (char*) &tmp_thd;
       thd->store_globals();
+      thd->set_query_inner((char*) STRING_WITH_LEN("intern:reload_acl"),
+                           default_charset_info);
     }
 
     if (likely(thd))

sql/sql_servers.cc

@@ -254,6 +254,8 @@ bool servers_init(bool dont_read_servers_table)
     DBUG_RETURN(TRUE);
   thd->thread_stack= (char*) &thd;
   thd->store_globals();
+  thd->set_query_inner((char*) STRING_WITH_LEN("intern:servers_init"),
+                       default_charset_info);
   /*
     It is safe to call servers_reload() since servers_* arrays and hashes which
     will be freed there are global static objects and thus are initialized

sql/sql_udf.cc

@@ -181,6 +181,8 @@ void udf_init()
   initialized = 1;
   new_thd->thread_stack= (char*) &new_thd;
   new_thd->store_globals();
+  new_thd->set_query_inner((char*) STRING_WITH_LEN("intern:udf_init"),
+                           default_charset_info);
   new_thd->set_db(&MYSQL_SCHEMA_NAME);
 
   tables.init_one_table(&new_thd->db, &MYSQL_FUNC_NAME, 0, TL_READ);

sql/tztime.cc

@@ -1623,6 +1623,8 @@ my_tz_init(THD *org_thd, const char *default_tzname, my_bool bootstrap)
     DBUG_RETURN(1);
   thd->thread_stack= (char*) &thd;
   thd->store_globals();
+  thd->set_query_inner((char*) STRING_WITH_LEN("intern:my_tz_init"),
+                       default_charset_info);
 
   /* Init all memory structures that require explicit destruction */
   if (my_hash_init(key_memory_tz_storage, &tz_names, &my_charset_latin1, 20, 0,