1.1.14

Released: September 5, 2017

orm

• [orm] [bug] Fixed bug in Session.merge() following along similar lines as that
  of #4030, where an internal check for a target object in
  the identity map could lead to an error if it were to be garbage collected
  immediately before the merge routine actually retrieves the object.

  References: #4069

• [orm] [bug] Fixed bug where an undefer_group() option would not be recognized
  if it extended from a relationship that was loading using joined eager
  loading. Additionally, as the bug led to excess work being performed,
  Python function call counts are also improved by 20% within the initial
  calculation of result set columns, complementing the joined eager load
  improvements of #3915.

  References: #4048

• [orm] [bug] Fixed race condition in ORM identity map which would cause objects
  to be inappropriately removed during a load operation, causing
  duplicate object identities to occur, particularly under joined eager
  loading which involves deduplication of objects. The issue is specific
  to garbage collection of weak references and is observed only under the
  PyPy interpreter.

  References: #4068

• [orm] [bug] Fixed bug in Session.merge() where objects in a collection that had
  the primary key attribute set to None for a key that is typically
  autoincrementing would be considered to be a database-persisted key for
  part of the internal deduplication process, causing only one object to
  actually be inserted in the database.

  References: #4056

• [orm] [bug] An InvalidRequestError is raised when a synonym()
  is used against an attribute that is not against a MapperProperty,
  such as an association proxy. Previously, a recursion overflow would
  occur trying to locate non-existent attributes.

  References: #4067

sql

• [sql] [bug] Altered the range specification for window functions to allow
  for two of the same PRECEDING or FOLLOWING keywords in a range
  by allowing for the left side of the range to be positive
  and for the right to be negative, e.g. (1, 3) is
  "1 FOLLOWING AND 3 FOLLOWING".

  References: #4053