[postgis-users] Improvement suggestion

[Paul van der Linden]

I indeed know that trick to eliminate an st_intersection, but that comes at
the cost of a st_within.
In the test-case I'm examing now, the st_intersects and st_within both take
about 40 seconds and the st_intersection takes about a minute.
So to eliminate one of the 40 seconds (and in this case even the
intersection because st_within is true), a function returning the relation
could speed up things
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