Raise error on empty in_pr/283

I think it would be good idea to add error on empy in_ usage in version 1.1.*
Because current implementation is not fully correct:
Firstly, it's not optimised, because of sequential scan
Secondly, in current implementation null in () will return null, when in sql it should return False, try this:
select null in (select 1 from some_table where false); -> false but not null

I understant that this can break some legacy code, but current implementation is obscure and quite expensive

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