USE tpch1;
create table if not exists MCOL657 (a int, b int) engine=columnstore;
insert into MCOL657 values (1,1), (2,2), (3,4), (NULL, NULL), (NULL, 2), (3, NULL);
select * from MCOL657 where a = b OR (a IS NULL AND b IS NULL);
a	b
1	1
2	2
NULL	NULL
select * from MCOL657 where a<=>b;
a	b
1	1
2	2
NULL	NULL
drop table MCOL657;