Tobias Wendorff wrote:
> AFAIK Mapnik runs this query:
> select xmin(ext),ymin(ext),xmax(ext),ymax(ext) from (select
> estimated_extent('<your table>','<your selection>') as ext) as tmp
>
> Perhaps this helps for debugging?
From a trace I saw yesterday, mapnik performs that exact same query for
each layer, even if the queried table is the same as it encountered
before. Even though the query usually executes in little time, there is
opportunity to cache the results, as an enhancement to mapnik.
--
Lennard
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