[postgis-devel] #700: ST_Boundary collection of empties crashes

[aperi2007]

I try to give my 2cents.

My suggestion is that perhaps is better to think to an empty geometry 
like it was
an invariant for all the geometry-type.

Start from this point of sight the question is
why an empty geometry must have a type ?

And following this line of sight

Empty(Point) = Empyt(Polygon)
or
Empty(GeometryCollection) = Empty(Polygon)

they give always an empty.

And again

Extract the n-the element from an Empty(Collection) give the same
result (an empty) of extract from the n-the element from an Empty(Point)

Regards,

Andrea Peri.