GEOMETRYCOLLECTION function

[Marioì Callisto]

Hello again!

I have the following working select, where poly1 and poly2 are POLYGON objects:

SELECT Area(Envelope(GeomCollFromText(CONCAT(
'GEOMETRYCOLLECTION(',
AsText(poly1),
', ',
AsText(poly2),
')'
)))) AS output
FROM table

What I wonder: is there a better (and probably also quicker) way to obtain the same not involving conversion to and from WKT?
Something like:

SELECT Area(Envelope(GeomCollFunction(poly1,poly2))) AS output
FROM table

I haven't found, or I missed, a function like that, able to create a GEOMETRYCOLLECTION object directly from n geometry objects in their internal format.

Thank you in advance,

Mario