On Apr 14, 2011, at 10:51 PM, botz wrote:
> 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
this is a trivial issue and is fixed in r79797e7d2ec9 . thanks for the report
>
>
> 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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