set @subselect_extra_no_sj_tmp=@@optimizer_switch; set @optimizer_switch_for_subselect_extra_test='semijoin=off,firstmatch=off,loosescan=off,semijoin_with_cache=off'; --source subselect_extra.test set optimizer_switch= @subselect_extra_no_sj_tmp; set @optimizer_switch_for_subselect_extra_test=null;