[orm] [bug] [engine] Added test support and repaired a wide variety of unnecessary reference
cycles created for short-lived objects, mostly in the area of ORM queries.
Thanks much to Carson Ip for the help on this.
[orm] [bug] Fixed regression in loader options introduced in 1.3.0b3 via #4468
where the ability to create a loader option using
PropComparator.of_type() targeting an aliased entity that is an
inheriting subclass of the entity which the preceding relationship refers
to would fail to produce a matching path. See also #5082 fixed
in this same release which involves a similar kind of issue.
[orm] [bug] Fixed regression in joined eager loading introduced in 1.3.0b3 via
#4468 where the ability to create a joined option across a
with_polymorphic() into a polymorphic subclass using
RelationshipProperty.of_type() and then further along regular mapped
relationships would fail as the polymorphic subclass would not add itself
to the load path in a way that could be located by the loader strategy. A
tweak has been made to resolve this scenario.
[orm] [performance] Identified a performance issue in the system by which a join is constructed
based on a mapped relationship. The clause adaption system would be used
for the majority of join expressions including in the common case where no
adaptation is needed. The conditions under which this adaptation occur
have been refined so that average non-aliased joins along a simple
relationship without a "secondary" table use about 70% less function calls.
[orm] [bug] Repaired a warning in the ORM flush process that was not covered by test
coverage when deleting objects that use the "version_id" feature. This
warning is generally unreachable unless using a dialect that sets the
"supports_sane_rowcount" flag to False, which is not typically the case
however is possible for some MySQL configurations as well as older Firebird
drivers, and likely some third party dialects.
[orm] [bug] Fixed bug where usage of joined eager loading would not properly wrap the
query inside of a subquery when Query.group_by() were used against
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Bumps sqlalchemy from 1.3.3 to 1.3.13.
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