create table t1 (a int, vcol1 int as (a+1), index(vcol1));
insert into t1 (a) select seq from seq_1_to_100;
SET SESSION debug_dbug="+d,vcol_subst_simulate_oom";
explain select * from t1 where a+1=2;
ERROR HY000: Out of memory.
SET @saved_dbug = @@SESSION.debug_dbug;
SET debug_dbug= @saved_dbug;
drop table t1;