On Monday, October 17, 2016 at 3:58:36 PM UTC-4, Mike Bayer wrote:
>
> that error is there right now because we don't emit the "col IS NULL" 
> SQL within that section of the persistence code. 
>
> took me a long time to find the history on this because I thought it had 
> been discussed but looks like the answer was "no immediate plans": 
> https://bitbucket.org/zzzeek/sqlalchemy/issues/2127#comment-9011753 
>
> that is, we can't just drop that assertion without adding logic to alter 
> the SQL for some parameters. 
>
 
I see. Makes sense. Thanks.

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