Backport into build-201002030816-5.0.87sp1

> ------------------------------------------------------------
> revno: 2818.1.18
> revision-id: li-bing.song@sun.com-20091103090041-zj7nedx6ok5jgges
> parent: davi.arnaut@sun.com-20091102201021-1brn7cjb1kvqg9gr
> committer: <Li-Bing.Song@sun.com>
> branch nick: mysql-5.0-bugteam
> timestamp: Tue 2009-11-03 17:00:41 +0800
> message:
>   BUG#48216 Replication fails on all slaves after upgrade to 5.0.86 on master
>   
>   When a sessione is closed, all temporary tables of the session are automatically 
>   dropped and are binlogged. But it will be binlogged with wrong database names when
>   the length of the temporary tables' database names are greater than the 
>   length of the current database name or the current database is not set.
>   
>   Query_log_event's db_len is forgot to set when Query_log_event's db is set.
>   This patch wrote code to set db_len immediately after db has set.

mysql-test/r/drop_temp_table.result

@@ -8,6 +8,7 @@ create temporary table shortn2 (a int);
 select get_lock("a",10);
 get_lock("a",10)
 1
+USE test;
 select get_lock("a",10);
 get_lock("a",10)
 1

mysql-test/t/drop_temp_table.test

@@ -14,6 +14,17 @@ create temporary table shortn1 (a int);
 create temporary table `table:name` (a int);
 create temporary table shortn2 (a int);
 select get_lock("a",10);
+
+#
+# BUG48216 Replication fails on all slaves after upgrade to 5.0.86 on master
+#
+# When the session is closed, any temporary tables of the session are dropped
+# and are binlogged. But it will be binlogged with a wrong database name when
+# the length of the database name('drop-temp-table-test') is greater than the
+# current database name('test').
+#
+USE test;
+
 disconnect con1;
 
 connection con2;

sql/sql_base.cc

@@ -798,6 +798,7 @@ void close_temporary_tables(THD *thd)
                             s_query.length() - 1 /* to remove trailing ',' */,
                             0, FALSE, THD::NOT_KILLED);
       qinfo.db= db.ptr();
+      qinfo.db_len= db.length();
       thd->variables.character_set_client= cs_save;
       DBUG_ASSERT(qinfo.error_code == 0);
       mysql_bin_log.write(&qinfo);