Changes in 0.3
==============

0.3.9
~~~~~

  - Added ability to specify option's default value as None
  - Fixed two-level graph introspection
  - AsyncIOExecutor now checks that function returns awaitable object and will
    raise TypeError to fail faster

0.3.8
~~~~~

  - Added GraphQL introspection functionality
  - Fixed bug in engine for the case, when linking function returns a generator
  - Improved GraphQL reader, added support for query variables and fragments

0.3.7
~~~~~

  - Fixed optional types checking and usage in expressions

0.3.6
~~~~~

  - Fixed SQLAlchemy source to properly lookup columns in table definitions

0.3.5
~~~~~

  - Added :py:class:`hiku.builder.Q` object for query building

0.3.4
~~~~~

  - Added Protocol Buffers support

0.3.3
~~~~~

  - Added Python 3.6 support

0.3.2
~~~~~

  - Fixed bug with result denormalization for links with Optional types

0.3.1
~~~~~

  - Added basic GraphQL support

0.3.0
~~~~~

  - Project structure refactoring

Backward-incompatible changes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  - :py:class:`hiku.result.Result` is not a subclass of ``defaultdict``
    anymore, it even not implements fully ``Mapping`` interface, only
    ``__getitem__`` is implemented

  - Moved :py:mod:`hiku.expr` to the :py:mod:`hiku.expr.core`
  - Moved :py:mod:`hiku.checker` to the :py:mod:`hiku.expr.checker`
  - Moved :py:mod:`hiku.compiler` to the :py:mod:`hiku.expr.compiler`
  - Moved :py:mod:`hiku.nodes` to the :py:mod:`hiku.expr.nodes`
  - Moved :py:mod:`hiku.refs` to the :py:mod:`hiku.expr.refs`

  - Renamed :py:class:`hiku.graph.AbstractEdge` into :py:class:`hiku.graph.AbstractNode`
  - Renamed :py:class:`hiku.graph.Edge` into :py:class:`hiku.graph.Node`
  - Renamed :py:class:`hiku.query.Edge` into :py:class:`hiku.query.Node`