On Mon, Nov 30, 2009 at 11:53 AM, Jaime Casanova
<[email protected]> wrote:
> 2009/11/30 Jaime Casanova <[email protected]>:
>> Hi,
>>
>> why we can't do $subject? it could have any benefit on the planner?
>>
>
> seems like while we can set the cost of the state transition function,
> that cost is not propagated...
I thought for sure you must be wrong about this, but I just read the
source code and, sure enough, the cost of the transition and final
functions are totally ignored. In fact, there's a comment about this
in cost_agg():
* Note: ideally we should use the pg_proc.procost costs of each
* aggregate's component functions, but for now that seems like an
* excessive amount of work.
...Robert
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