drop table if exists A1;
drop table if exists A_M;
CREATE TABLE A1( a DateTime ) ENGINE = MergeTree ORDER BY tuple();
CREATE TABLE A_M as A1 ENGINE = Merge(currentDatabase(), '^A1$');
insert into A1(a) select now();

SELECT tupleElement(arrayJoin([(1, 1)]), 1) FROM A_M PREWHERE tupleElement((1, 1), 1) =1;

SELECT tupleElement(arrayJoin([(1, 1)]), 1) FROM A_M WHERE tupleElement((1, 1), 1) =1;

SELECT tupleElement(arrayJoin([(1, 1)]), 1) FROM A1 PREWHERE tupleElement((1, 1), 1) =1;

drop table A1;
drop table A_M;
