On Mar 27, 2014, at 4:38 PM, Chris Friesen <chris.frie...@windriver.com> wrote:
> On 03/27/2014 04:47 PM, Chris Friesen wrote:
>
>> Interestingly, unit test
>> nova.tests.api.openstack.compute.contrib.test_server_groups.ServerGroupTest.test_display_members
>> passes just fine, and it seems to be running the same sqlalchemy code.
>>
>> Is this a case where sqlite behaves differently from mysql?
>
> Sorry to keep replying to myself, but this might actually hit us other places.
>
> Down in db/sqlalchemy/api.py we end up calling
>
>
> query = query.filter(column_attr.op(db_regexp_op)('None’))
Sqlalchemy handles mapping None to NULL in many cases, so it appears that the
problem is that we are passing
None as a string here?
Vish
>
>
> When using mysql, it looks like a regexp comparison of the string 'None'
> against a NULL field fails to match.
>
> Since sqlite doesn't have its own regexp function we provide one in
> openstack/common/db/sqlalchemy/session.py. In the buggy case we end up
> calling it as regexp('None', None), where the types are "unicode" and
> "NoneType". However, we end up converting the second arg to text type before
> calling reg.search() on it, so it matches.
>
> Chris
>
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