Vincent Mora writes:
> If I understand the problem correctly, on upgrate (ALTER EXTENSION), the
> old postgis library is already loaded, the old spatial functions are
> replaced by new ones pointing to the new postgis library, a call to
> DefineCustomStringVariable is made and:
> ERROR:
Hi,
When creating postgis extension, a call to DefineCustomStringVariable is
made to define postgis.backend.
An assign hook allows to change the library used by spatial functions
whith a:
SET postgis.backend = 'sfcgal'; -- or 'geos'
Everything work fine execept when upgrading postgis.
