[orm] [usecase] Established support for _orm.synoynm() in conjunction with
hybrid property, assocaitionproxy is set up completely, including that
synonyms can be established linking to these constructs which work
fully. This is a behavior that was semi-explicitly disallowed previously,
however since it did not fail in every scenario, explicit support
for assoc proxy and hybrids has been added.
[orm] [performance] [bug] [regression] [sql] Fixed a critical performance issue where the traversal of a
_sql.select() construct would traverse a repetitive product of the
represented FROM clauses as they were each referred towards by columns in
the columns clause; for a series of nested subqueries with lots of columns
this could cause a large delay and significant memory growth. This
traversal is used by a wide variety of SQL and ORM functions, including by
the ORM _orm.Session when it's configured to have
"table-per-bind", which while this is not a common use case, it seems to be
what Flask-SQLAlchemy is hardcoded as using, so the issue impacts
Flask-SQLAlchemy users. The traversal has been repaired to uniqify on FROM
clauses which was effectively what would happen implicitly with the pre-1.4
architecture.
[orm] [bug] [regression] Fixed regression where an attribute that is mapped to a
_orm.synonym() could not be used in column loader options such as
_orm.load_only().
[sql] [bug] [regression] Fixed regression where an empty in statement on a tuple would result
in an error when compiled with the option literal_binds=True.
[postgresql] [bug] [regression] [sql] Fixed an argument error in the default and PostgreSQL compilers that
would interfere with an UPDATE..FROM or DELETE..FROM..USING statement
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Bumps sqlalchemy from 1.3.11 to 1.4.9.
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