event insert into select from engince columnstore not working

Hi,

I am trying to use event to update a table using insert into select from a columnstore table, and nothing is happening. if doing a classic insert it work or if the select is not using columnstore engine. Sample code to reproduce is below.

drop table toto;
create table toto (a integer,b integer) Engine=Columnstore;
create table feed (a integer,b integer) Engine=Columnstore;
insert into feed(a,b) values (100,200),(10,20),(1000,2000);
drop event insert_debug;

1. 1. WORK
      create event insert_debug
      on schedule every 5 second
      do
      insert into toto select (1,2);

1. DONT WORK
   create event insert_debug
   on schedule every 5 second
   do
   insert into toto
   select a,b from feed;