expressions.py
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	# -- coding: utf-8 --
	#
	## This file is part of Invenio.
	## Copyright (C) 2011, 2012, 2013 CERN.
	##
	## Invenio is free software; you can redistribute it and/or
	## modify it under the terms of the GNU General Public License as
	## published by the Free Software Foundation; either version 2 of the
	## License, or (at your option) any later version.
	##
	## Invenio is distributed in the hope that it will be useful, but
	## WITHOUT ANY WARRANTY; without even the implied warranty of
	## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	## General Public License for more details.
	##
	## You should have received a copy of the GNU General Public License
	## along with Invenio; if not, write to the Free Software Foundation, Inc.,
	## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
	"""
	invenio.ext.sqlalchemy.expressions
	----------------------------------

	Implements various custom ORM expressions.
	"""

	from sqlalchemy.ext.compiler import compiles
	from sqlalchemy.sql.expression import FunctionElement


	class AsBINARY(FunctionElement):
	name = 'AsBINARY'


	@compiles(AsBINARY)
	def compile(element, compiler, **kw):
	return "BINARY %s" % compiler.process(element.clauses)