Known domains for calculating field of view.
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                 Key: CORE-6127
                 URL: http://tracker.firebirdsql.org/browse/CORE-6127
             Project: Firebird Core
          Issue Type: Improvement
          Components: Engine
    Affects Versions: 2.5.9, 4.0 Beta 1, 3.0.4
            Reporter: rdb_dev
            Priority: Trivial


When you use calculated fields in a view, whether the field type is cast to a 
domain through the Cast function, whether it is a known domain from the result 
of a stored procedure or function, or simply derived dynamically from an 
expression, in any case, the automatically generated RDB$<number> domain is 
used to create the view for that field.

Please improve the functionality so that when creating a view, the domains 
available in the database are taken into account for the calculated fields, if, 
based on the expression, the domain is known (when the end result is brought to 
a specific domain via Cast or is a known domain from the result of a stored 
procedure or function), so that when creating views with such fields, the 
automatically created RDB$<number>domains do not multiply.

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