>>>
>>
>> cheapest and easiest solution if you run into this: add "fake" functions
>> which the planner cannot estimate properly.
>> use OR to artificially prop up estimates or use AND to artificially lower
>> them. there is actually no need to redesign the schema to get around it but
>> it is such an ugly solution that it does not even deserve to be called
>> "ugly" ...
>> however, fast and reliable way to get around it.
>
> We couldn't possibly design a hint mechanism that would be uglier or
> less future-proof than this workaround (which, by the way, I'll keep
> in mind for the next time I get bitten by this).
>
> --
> Robert Haas
> EnterpriseDB: http://www.enterprisedb.com
> The Enterprise PostgreSQL Company
>
i think the main issue is: what we do is ugly because of despair and a lack of
alternative ... what you proposed is ugly by design ;).
overall: the workaround will win the ugliness contest, however ;).
many thanks,
hans
--
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A-2700 Wiener Neustadt, Austria
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