I'm trying to solve a mistery (and I didn't know is I should post here
or to the the devel list)
ST_Distance between complex polygons is very slow here, despite the work
done in http://boundlessgeo.com/2012/07/making-geography-faster/ .. It's
taking like 4 seconds.
Looking harder into this I see there's a _st_distancetree(geo1, geo2)
that completes the task in 171 ms....
It seems to me that the standard ST_Distance is not using the new
"circular bounding boxes" code...
So I downloaded the source code and I saw that geography_distance_cache
always fails because GetCircTreeGeomCache always returns null. I see
that a cache is initialized and put into a "generic cache" array, but
then is reset to null in GetGenericCacheCollection when called from
GetPROJ4SRSCache beacuse "fcinfo->flinfo->fn_extra" is again null...
(set in MemoryContextAllocZero)
Does this what I am saying make sense? =)
How is this cache supposed to work?
Thanks for any help!
--
Nicolás.-
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