This is already on TODO list.
> In 6.5.3, it seems that UNION is not allowed inside a sub-select:
>
> bray=> select p.id, p.name, a.town from person* as p, address as a
> bray=> where p.id in
> bray-> (select id from customer union select id from supplier);
> ERROR: parser: parse error at or near "union"
>
> The same applies to EXCEPT and INTERSECT.
>
> Is this a permanent feature, an oversight, or something already on the TODO
> list?
>
>
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>
>
> ************
>
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