[orm] [bug] Adjusted the ORM's interpretation of the "target" entity used within
Update and Delete to not interfere with the target
"from" object passed to the statement, such as when passing an ORM-mapped
_orm.aliased construct that should be maintained within a phrase
like "UPDATE FROM". Cases like ORM session synchonize using "SELECT"
statements such as with MySQL/ MariaDB will still have issues with
UPDATE/DELETE of this form so it's best to disable synchonize_session when
using DML statements of this type.
[orm] [bug] Added new capability to the _orm.selectin_polymorphic() loader option
which allows other loader options to be bundled as siblings, referring to
one of its subclasses, within the sub-options of parent loader option.
Previously, this pattern was only supported if the
_orm.selectin_polymorphic() were at the top level of the options for
the query. See new documentation section for example.
As part of this change, improved the behavior of the
_orm.Load.selectin_polymorphic() method / loader strategy so that the
subclass load does not load most already-loaded columns from the parent
table, when the option is used against a class that is already being
relationship-loaded. Previously, the logic to load only the subclass
columns worked only for a top level class load.
[engine] [bug] Fixed a series of reflection issues affecting the PostgreSQL,
MySQL/MariaDB, and SQLite dialects when reflecting foreign key constraints
where the target column contained parenthesis in one or both of the table
name or column name.
[sql] [usecase] Adjusted the _types.Enum datatype to accept an argument of
None for the _types.Enum.length parameter, resulting in a
VARCHAR or other textual type with no length in the resulting DDL. This
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Bumps sqlalchemy from 2.0.20 to 2.0.21.
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Sourced from sqlalchemy's releases.
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