[postgis-devel] join selectivity estimator

[strk at refractions.net]

I've committed in Mark implementation of the JOIN selectivity
estimator and written a perl tester for it (utils/test_joinestimation.pl).

The code is still experimental, but I don't think can be of any 
harm. In any case, it can be disabled (switching back to returning
a default selectivity) undefining REALLY_DO_JOINSEL on top
of lwgeom/lwgeom_estimate.c

Please report your test results.

--strk;