Removed unnecessary current_thd

sql/sql_select.cc

@@ -5305,7 +5305,7 @@ make_join_select(JOIN *join,SQL_SELECT *select,COND *cond)
           if (!(tmp= add_found_match_trig_cond(first_inner_tab, tmp, 0)))
             DBUG_RETURN(1);
           tab->select_cond=sel->cond=tmp;
-	  if (current_thd->variables.engine_condition_pushdown)
+	  if (join->thd->variables.engine_condition_pushdown)
           {
             tab->table->file->pushed_cond= NULL;
 	    /* Push condition to handler */
@@ -5433,7 +5433,7 @@ make_join_select(JOIN *join,SQL_SELECT *select,COND *cond)
 		join->thd->memdup((gptr) sel, sizeof(SQL_SELECT));
 	      tab->cache.select->cond=tmp;
 	      tab->cache.select->read_tables=join->const_table_map;
-	      if (current_thd->variables.engine_condition_pushdown &&
+	      if (join->thd->variables.engine_condition_pushdown &&
 		  (!tab->table->file->pushed_cond))
               {
 		/* Push condition to handler */