Commented by: @pcisar

Adriano, can you provide a test case for this issue please? I would like write a test for it.

Commented by: @asfernandes

The test case for the first (fbintl) issue, fixed in V2.0 is:
-------------
create database 't.fdb';
create table t (c varchar(10) character set win1250 collate pxw_csy);
insert into t values ('ch');

select * from t where c starting with 'c';
commit;

create index t_c on t (c);
select * from t where c starting with 'c';
-------------

Test case for UNICODE issue I can't write.
V2 has such compressions pairs in UNICODE collation, but it don't support locale attribute which may make easy to reproduce.

I could not write these unicode chars to reproduce problem in V2.

Commented by: @pcisar

Fix verified for 2.0.0, test added.