Update sqlalchemy to 1.3.17

[pyup-bot]

This PR updates SQLAlchemy from 1.3.16 to 1.3.17.

Changelog

1.3.17

:released: May 13, 2020

 .. change::
     :tags: bug, oracle
     :tickets: 5246

     Some modifications to how the cx_oracle dialect sets up per-column
     outputtype handlers for LOB and numeric datatypes to adjust for potential
     changes coming in cx_Oracle 8.


 .. change::
     :tags: bug, orm
     :tickets: 5288

     Fixed bug where using :func:`.with_polymorphic` as the target of a join via
     :meth:`.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.

 .. change::
     :tags: bug, oracle, performance
     :tickets: 5314

     Changed the implementation of fetching CLOB and BLOB objects to use
     cx_Oracle's native implementation which fetches CLOB/BLOB objects inline
     with other result columns, rather than performing a separate fetch. As
     always, this can be disabled by setting auto_convert_lobs to False.

     As part of this change, the behavior of a CLOB that was given a blank
     string on INSERT now returns None on SELECT, which is now consistent with
     that of VARCHAR on Oracle.


 .. change::
     :tags: usecase, postgresql
     :tickets: 5265

     Added support for columns or type :class:`.ARRAY` of :class:`.Enum`,
     :class:`.JSON` or :class:`_postgresql.JSONB` in PostgreSQL.
     Previously a workaround was required in these use cases.


 .. change::
     :tags: schema
     :tickets: 4138

     Add ``comment`` attribute to :class:`_schema.Column` ``__repr__`` method.

 .. change::
     :tags: bug, orm
     :tickets: 5303

     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.


 .. change::
     :tags: bug, engine
     :tickets: 5326

     Fixed fairly critical issue where the DBAPI connection could be returned to
     the connection pool while still in an un-rolled-back state. The reset agent
     responsible for rolling back the connection could be corrupted in the case
     that the transaction was "closed" without being rolled back or committed,
     which can occur in some scenarios when using ORM sessions and emitting
     .close() in a certain pattern involving savepoints.   The fix ensures that
     the reset agent is always active.


 .. change::
     :tags: bug, orm
     :tickets: 5304

     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.


 .. change::
     :tags: usecase, postgresql
     :tickets: 5266

     Raise an explicit :class:`.exc.CompileError` when adding a table with a
     column of type :class:`.ARRAY` of :class:`.Enum` configured with
     :paramref:`.Enum.native_enum` set to ``False`` when
     :paramref:`.Enum.create_constraint` is not set to ``False``

 .. change::
     :tags: bug, schema
     :tickets: 5298

     Fixed issue where an :class:`.Index` that is deferred in being associated
     with a table, such as as when it contains a :class:`.Column` that is not
     associated with any :class:`.Table` yet,  would fail to attach correctly if
     it also contained a non table-oriented expession.


 .. change::
     :tags: change, firebird
     :tickets: 5278

     Adjusted dialect loading for ``firebird://`` URIs so the external
     sqlalchemy-firebird dialect will be used if it has been installed,
     otherwise fall back to the (now deprecated) internal Firebird dialect.

 .. change::
     :tags: bug, mssql, reflection
     :tickets: 5255

     Fix a regression introduced by the reflection of computed column in
     MSSQL when using the legacy TDS version 4.2. The dialect will try
     to detect the protocol version of first connect and run in compatibility
     mode if it cannot detect it.

 .. change::
     :tags: bug, mssql, reflection
     :tickets: 5271

     Fix a regression introduced by the reflection of computed column in
     MSSQL when using SQL server versions before 2012, which does not support
     the ``concat`` function.

 .. change::
     :tags: bug, orm
     :tickets: 5269

     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
     :meth:`~.RelationshipProperty.Comparator.has`.


 .. change::
     :tags: usecase, orm
     :tickets: 5262

     Added an accessor :attr:`.ColumnProperty.Comparator.expressions` which
     provides access to the group of columns mapped under a multi-column
     :class:`.ColumnProperty` attribute.


 .. change::
     :tags: bug, schema
     :tickets: 5316

     A warning is emitted when making use of the :attr:`.MetaData.sorted_tables`
     attribute as well as the :func:`_schema.sort_tables` function, and the
     given tables cannot be correctly sorted due to a cyclic dependency between
     foreign key constraints. In this case, the functions will no longer sort
     the involved tables by foreign key, and a warning will be emitted. Other
     tables that are not part of the cycle will still be returned in dependency
     order. Previously, the sorted_table routines would return a collection that
     would unconditionally omit all foreign keys when a cycle was detected, and
     no warning was emitted.


 .. change::
     :tags: orm, usecase
     :tickets: 5237

     Introduce :paramref:`_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 :ticket:`5149`,
     which warned that ``viewonly=True`` relationship target of a
     back_populates or backref configuration would be disallowed.

.. changelog::

Links

• PyPI: https://pypi.org/project/sqlalchemy
• Changelog: https://pyup.io/changelogs/sqlalchemy/
• Homepage: http://www.sqlalchemy.org

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