Dare I say it, but I think there's a bug in lwgeom_functions_basic.c
in the LWGEOM_collect_garray function. According to the docs /
comments, this should return a multiX if all the objects are multiX,
but the code on line 2112 (and around) appears to stop that happening.
/* Output type not initialized */
if ( ! outtype ) {
/* Input is single, make multi */
if ( intype < 4 ) outtype = intype+3;
/* Input is multi, make collection */
else outtype = COLLECTIONTYPE;
}
Or, in pseudo-code, if the input object is a multiX or collection, the
output will be a GOEMETRYCOLLECTION. Always. This ain't what it says
in the function header.
* returned geometry is the simplest possible, based on the types
* of the collected objects
* ie. if all are of either X or multiX, then a multiX is returned
I tried logging the bug on the PHP bug tracker, but I think I need to
be a different class of user since I'm asked to log in (when I'm
already logged in) to post a bug report.
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