I'm not sure how to interpret the manual regarding the use of tuples in 
semi-joins. The following syntax is valid SQL in some databases:

-- Oracle
select 1 from dual where (1, 2) in (select 1, 2 from dual)

-- Postgres
select 1 where (1, 2) in (select 1, 2)

H2 doesn't seem to support either statement. Does H2 support subqueries in 
IN-predicates, when the left-hand side is a tuple?

Cheers
Lukas

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