refs codership/mysql-wsrep#110 - clear table map events on SAVEPOINT

Clear binlog table maps before writing SAVEPOINT query event into
binlog cache. This enforces recreation of table map events for the
following row event.

sql/log.cc

@@ -2282,6 +2282,11 @@ static int binlog_savepoint_set(handlerton *hton, THD *thd, void *sv)
   char buf[1024];
 #ifdef WITH_WSREP
   if (wsrep_emulate_bin_log) DBUG_RETURN(0);
+  /*
+    Clear table maps before writing SAVEPOINT event. This enforces
+    recreation of table map events for the following row event.
+   */
+  thd->clear_binlog_table_maps();
 #endif /* WITH_WSREP */
   String log_query(buf, sizeof(buf), &my_charset_bin);
   if (log_query.copy(STRING_WITH_LEN("SAVEPOINT "), &my_charset_bin) ||