Here's a quick example:
the query form i'm aiming for is:
select x - lag(x) over ( order by x ) from a;
meta=MetaData()
a = Table('a', meta, Column('x',Integer))
print select([ a.c.x , over( func.lag(a.c.x), order_by =
a.c.x ) ] ) # no problem
print select([ a.c.x - over( func.lag(a.c.x), order_by =
a.c.x ) ] ) # this one fails to compile
Here's the error:
print select([ a.c.x - over( func.lag(a.c.x), order_by =
a.c.x ) ] )
File "/usr/local/lib/python2.7/site-packages/SQLAlchemy-0.7b4dev-
py2.7-linux-x86_64.egg/sqlalchemy/sql/expression.py", line 276, in
select
**kwargs)
File "/usr/local/lib/python2.7/site-packages/SQLAlchemy-0.7b4dev-
py2.7-linux-x86_64.egg/sqlalchemy/sql/expression.py", line 4317, in
__init__
self._froms.update(_from_objects(*self._raw_columns))
File "/usr/local/lib/python2.7/site-packages/SQLAlchemy-0.7b4dev-
py2.7-linux-x86_64.egg/sqlalchemy/sql/expression.py", line 1165, in
_from_objects
return itertools.chain(*[element._from_objects for element in
elements])
File "/usr/local/lib/python2.7/site-packages/SQLAlchemy-0.7b4dev-
py2.7-linux-x86_64.egg/sqlalchemy/sql/expression.py", line 3265, in
_from_objects
return self.left._from_objects + self.right._from_objects
TypeError: can only concatenate list (not "itertools.chain") to list
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