create table data_02021 (key Int) engine=MergeTree() order by key;
insert into data_02021 values (1);
-- { echoOn }
select * from data_02021 prewhere 1 or ignore(key);
select * from data_02021 prewhere 1 or ignore(key) where key = 1;
select * from data_02021 prewhere 0 or ignore(key);
select * from data_02021 prewhere 0 or ignore(key) where key = 1;
-- { echoOff }
drop table data_02021;
