[Zope3-dev] possible bug in catalog code

[Jim Fulton]

Martijn Faassen wrote:
> Jim Fulton wrote:
> [snip]
> 
>> It would only be safe to use None as a BTree key if all of the keys used
>> were None, which wouldn't be very interesting. :)
> 
> 
> It'd also make sense if you didn't do a range query, right? I.e. you're 
> just looking for (None, None). I realize though that queries with None 
> do something else entirely, as they open the range.

Any lookup in a BTree is a range query -- it depends on orderability
of the keys.

> Anyway, perhaps a comment should be in place specifying that None cannot 
> be indexed; this way it just looked surprising.

Sure.  There should probably be a note that all of the keys *must*
be orderable in a way that is consistent accross processes and Python
versons.  This is a far more likely gotcha.

Jim

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