Mike Conley wrote:
> Either of these works for the individual queries, but when combined in the
> union() or union_all() the result is still that the literal from the first
> query is used on all result rows
>
> q1 = session.query(A.data.label('somedata'), literal('A').label('source'))
> q2 = session.query(B.data.label('somedata'), literal('B').label('source'))
> qry = q1.union(q2)
> generates the SQL
> SELECT anon_1.somestuff AS somestuff, ? AS source
> FROM (SELECT a.data AS somestuff, ? AS source
> FROM a UNION ALL SELECT b.data AS somestuff, ? AS source
> FROM b) AS anon_1
> with bind parameters
> ['A', 'A', 'B']
OK this is more of a select_from() use case. I would try qry =
q1.union(q2).subquery(); Query(qry.foo, qry.bar).
query.union() is a little new so I'm not entirely convinced we have the
full flexibility of select() constructs here (which of course would be the
fallback).
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