Changelog category (leave one):

• Bug Fix

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Fix negate function monotonicity. In previous versions, the query select * from a where -x = -42; where x is the primary key, can return a wrong result.

Fixes this:

create table a (x UInt64) engine MergeTree order by x;
insert into a values (12345678901234567890), (42);
select * from a where -x = -42;

It used to return empty result because KeyCondition took the range [42, 12345678901234567890], asked function negate whether it's monotonic on this range, it (incorrectly) said yes, and KeyCondition applied negate to this range, producing an inverted range [6101065172474983726, -42] (where 6101065172474983726 is what -12345678901234567890 overflows to).