Bump sqlalchemy from 1.3.16 to 1.3.17

[dependabot-preview]

Bumps sqlalchemy from 1.3.16 to 1.3.17.

Release notes

Sourced from sqlalchemy's releases.

1.3.17

Released: May 13, 2020

orm

• [orm] [bug] Fixed bug where using with_polymorphic() as the target of a join via RelationshipComparator.of_type() on a mapper that already has a subquery-based with_polymorphic setting that's equivalent to the one requested would not correctly alias the ON clause in the join.

  References: #5288

• [orm] [bug] Fixed issue in the area of where loader options such as selectinload() interact with the baked query system, such that the caching of a query is not supposed to occur if the loader options themselves have elements such as with_polymorphic() objects in them that currently are not cache-compatible. The baked loader could sometimes not fully invalidate itself in these some of these scenarios leading to missed eager loads.

  References: #5303

• [orm] [bug] Modified the internal "identity set" implementation, which is a set that hashes objects on their id() rather than their hash values, to not actually call the __hash__() method of the objects, which are typically user-mapped objects. Some methods were calling this method as a side effect of the implementation.

  References: #5304

• [orm] [bug] An informative error message is raised when an ORM many-to-one comparison is attempted against an object that is not an actual mapped instance. Comparisons such as those to scalar subqueries aren't supported; generalized comparison with subqueries is better achieved using ~.RelationshipProperty.Comparator.has().

  References: #5269

• [orm] [usecase] Added an accessor ColumnProperty.Comparator.expressions which provides access to the group of columns mapped under a multi-column ColumnProperty attribute.

  References: #5262

• [orm] [usecase] Introduce _orm.relationship.sync_backref flag in a relationship to control if the synchronization events that mutate the in-Python attributes are added. This supersedes the previous change #5149, which warned that viewonly=True relationship target of a back_populates or backref configuration would be disallowed.

... (truncated)

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