Compound select statements ending in a VALUES-clause do not work properly. #2316

Executing a compound select statement of the form

[select-core] [set-operator] [values-clause]
-- e.g. select * from table intersect values (...), ..., (...)
-    or values (...), ..., (...) intersect values (...), ..., (...)

results in a table that has the same shape as the actual result, but every cell is shaded red and contains loading... in italic. Currently, I can work around this by swapping the operands of the [set-operator] (unless it is except or both operands are values clauses), or by wrapping the values clause or the entire compound select statement in a with clause and selecting from it, i.e.

[values-clause] [set-operator] [select-core]

-- OR

with tmp as ( [values-clause] )
[select-core] [set-operator] select * from tmp

-- OR

with tmp as ( [select-core] [set-operator] [values-clause] )
select * from tmp

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