Comment from https://github.com/MariaDB/server/pull/153

storage/oqgraph/ha_oqgraph.cc

@@ -1103,7 +1103,7 @@ int ha_oqgraph::info(uint flag)
 
 int ha_oqgraph::extra(enum ha_extra_function operation)
 {
-  if (graph->get_thd() != current_thd) {
+  if (graph->get_thd() != ha_thd()) {
     DBUG_PRINT( "oq-debug", ("rnd_pos g->table->in_use: 0x%lx <-- current_thd 0x%lx", (long) graph->get_thd(), (long) current_thd));
     graph->set_thd(current_thd);
   }