1.2.1

Released: January 15, 2018

• [bug] [sql] Fixed bug in Insert.values() where using the "multi-values"
  format in combination with Column objects as keys rather
  than strings would fail. Pull request courtesy Aubrey Stark-Toller.

  This change is also backported to: 1.1.16

  References: #4162

• [bug] [orm] Fixed bug where an object that is expunged during a rollback of
  a nested or subtransaction which also had its primary key mutated
  would not be correctly removed from the session, causing subsequent
  issues in using the session.

  This change is also backported to: 1.1.16

  References: #4151

• [bug] [orm] Fixed regression where pickle format of a Load / _UnboundLoad object (e.g.
  loader options) changed and __setstate__() was raising an
  UnboundLocalError for an object received from the legacy format, even
  though an attempt was made to do so. tests are now added to ensure this
  works.

  References: #4159

• [bug] [ext] Fixed regression in association proxy due to #3769
  (allow for chained any() / has()) where contains() against
  an association proxy chained in the form
  (o2m relationship, associationproxy(m2o relationship, m2o relationship))
  would raise an error regarding the re-application of contains()
  on the final link of the chain.

  References: #4150

• [bug] [orm] Fixed regression caused by new lazyload caching scheme in #3954
  where a query that makes use of loader options with of_type would cause
  lazy loads of unrelated paths to fail with a TypeError.

  References: #4153

• [bug] [oracle] Fixed regression where the removal of most setinputsizes
  rules from cx_Oracle dialect impacted the TIMESTAMP
  datatype's ability to retrieve fractional seconds.

  References: #4157

• [bug] [tests] Removed an oracle-specific requirements rule from the public
  test suite that was interfering with third party dialect
  suites.

• [bug] [mssql] Fixed regression in 1.2 where newly repaired quoting
  of collation names in #3785 breaks SQL Server,
  which explicitly does not understand a quoted collation
  name. Whether or not mixed-case collation names are
  quoted or not is now deferred down to a dialect-level
  decision so that each dialect can prepare these identifiers
  directly.

  References: #4154

• [bug] [orm] Fixed bug in new "selectin" relationship loader where the loader could try
  to load a non-existent relationship when loading a collection of
  polymorphic objects, where only some of the mappers include that
  relationship, typically when PropComparator.of_type() is being used.

  References: #4156

• [bug] [tests] Added a new exclusion rule group_by_complex_expression
  which disables tests that use "GROUP BY ", which seems
  to be not viable for at least two third party dialects.

• [bug] [oracle] Fixed regression in Oracle imports where a missing comma caused
  an undefined symbol to be present. Pull request courtesy
  Miroslav Shubernetskiy.