drop table if exists prewhere_column_missing; set allow_deprecated_syntax_for_merge_tree=1; create table prewhere_column_missing (d Date default '2015-01-01', x UInt64) engine=MergeTree(d, x, 1); insert into prewhere_column_missing (x) values (0); select * from prewhere_column_missing; alter table prewhere_column_missing add column arr Array(UInt64); select * from prewhere_column_missing; select *, arraySum(arr) as s from prewhere_column_missing; select *, arraySum(arr) as s from prewhere_column_missing where s = 0; select *, arraySum(arr) as s from prewhere_column_missing prewhere s = 0; select *, length(arr) as l from prewhere_column_missing; select *, length(arr) as l from prewhere_column_missing where l = 0; select *, length(arr) as l from prewhere_column_missing prewhere l = 0; alter table prewhere_column_missing add column hash_x UInt64 default intHash64(x); select * from prewhere_column_missing; select * from prewhere_column_missing where hash_x = intHash64(x); select * from prewhere_column_missing prewhere hash_x = intHash64(x); select * from prewhere_column_missing where hash_x = intHash64(x) and length(arr) = 0; select * from prewhere_column_missing prewhere hash_x = intHash64(x) and length(arr) = 0; select * from prewhere_column_missing where hash_x = intHash64(x) and length(arr) = 0 and arraySum(arr) = 0; select * from prewhere_column_missing prewhere hash_x = intHash64(x) and length(arr) = 0 and arraySum(arr) = 0; drop table prewhere_column_missing;