Field alias disapears in complex query
--------------------------------------
Key: CORE-5713
URL: http://tracker.firebirdsql.org/browse/CORE-5713
Project: Firebird Core
Issue Type: Bug
Affects Versions: 2.5.8, 3.0.2, 2.5.7
Reporter: Alex Kurov
For example this query has a predictable result with two columns: a1 and a2
select 1 a1, 2 a2
from rdb$database
union all
select 1 a1, coalesce(cast(null as varchar(64)), 0) a2
from rdb$database
But this one has a result with columns a1 and F_1
select a1, a2
from
(select 1 a1, 2 a2
from rdb$database)
group by 1, 2
union all
select 1 a1, coalesce(cast(null as varchar(64)), 0) a2
from rdb$database
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