1.2.6

Released: March 30, 2018

• [bug] [mssql] Adjusted the SQL Server version detection for pyodbc to only allow for
  numeric tokens, filtering out non-integers, since the dialect does tuple-
  numeric comparisons with this value. This is normally true for all known
  SQL Server / pyodbc drivers in any case.

  References: #4227

• [feature] [postgresql] Added support for "PARTITION BY" in PostgreSQL table definitions,
  using "postgresql_partition_by". Pull request courtesy
  Vsevolod Solovyov.

• [bug] [sql] Fixed a regression that occurred from the previous fix to #4204 in
  version 1.2.5, where a CTE that refers to itself after the
  CTE.alias() method has been called would not refer to itself
  correctly.

  References: #4204

• [bug] [engine] Fixed bug in connection pool where a connection could be present in the
  pool without all of its "connect" event handlers called, if a previous
  "connect" handler threw an exception; note that the dialects themselves
  have connect handlers that emit SQL, such as those which set transaction
  isolation, which can fail if the database is in a non-available state, but
  still allows a connection. The connection is now invalidated first if any
  of the connect handlers fail.

  References: #4225

• [bug] [oracle] The minimum cx_Oracle version supported is 5.2 (June 2015). Previously,
  the dialect asserted against version 5.0 but as of 1.2.2 we are using some
  symbols that did not appear until 5.2.

  References: #4211

• [bug] [declarative] Removed a warning that would be emitted when calling upon
  __table_args__, __mapper_args__ as named with a @declared_attr
  method, when called from a non-mapped declarative mixin. Calling these
  directly is documented as the approach to use when one is overriding one
  of these methods on a mapped class. The warning still emits for regular
  attribute names.

  References: #4221

• [bug] [orm] Fixed bug where using Mutable.associate_with() or
  Mutable.as_mutable() in conjunction with a class that has non-
  primary mappers set up with alternatively-named attributes would produce an
  attribute error. Since non-primary mappers are not used for persistence,
  the mutable extension now excludes non-primary mappers from its
  instrumentation steps.

  References: #4215