ST_IsEmpty('GEOMETRYCOLLECTION(GEOMETRYCOLLECTION EMPTY)')

[strk]

A collection of empty collections is empty to me, what do you think ? We return false currently

[pramsey]

A collection of empty geometries has ngeoms > 0, but from a spatial coverage point of view is just as empty as a non empty thing. We mainly want to be careful not to short circuit functions that work against numelements when numelements is > 0, even when the contents are empty.

[strk]

for example: should ST_Dump return all empty elements or not ? The current situation is it returns some (not all)

[strk]

r8725 fixes this (and ST_Dump dumps nothing).