[orm] [bug] [dataclasses] Fixed issue in new ORM dataclasses functionality where dataclass fields on
an abstract base or mixin that contained column or other mapping constructs
would not be mapped if they also included a "default" key within the
dataclasses.field() object.
[orm] [bug] [regression] Fixed regression where the _orm.Query.selectable accessor, which is
a synonym for _orm.Query.__clause_element__(), got removed, it's now
restored.
[orm] [bug] [regression] Fixed regression where use of an unnamed SQL expression such as a SQL
function would raise a column targeting error if the query itself were
using joinedload for an entity and was also being wrapped in a subquery by
the joinedload eager loading process.
[orm] [bug] [regression] Fixed regression where the _orm.Query.filter_by() method would fail
to locate the correct source entity if the _orm.Query.join() method
had been used targeting an entity without any kind of ON clause.
[orm] [bug] [regression] Fixed regression where the SQL compilation of a Function would
not work correctly if the object had been "annotated", which is an internal
memoization process used mostly by the ORM. In particular it could affect
ORM lazy loads which make greater use of this feature in 1.4.
[orm] [bug] Fixed regression where the ConcreteBase would fail to map at all
when a mapped column name overlapped with the discriminator column name,
producing an assertion error. The use case here did not function correctly
in 1.3 as the polymorphic union would produce a query that ignored the
discriminator column entirely, while emitting duplicate column warnings. As
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Bumps sqlalchemy from 1.3.23 to 1.4.2.
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