id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
1364	[raster] Make ST_Union a c-implementation	robe	dustymugs	"Bborie,

Just putting this on the list before I forget to.  I'm still revising Pierre's code to get rid or the rasterexp and the infinite number of state functions.  I'm almost done but doing some spot checking  to make sure my revised looks right.

Hopefully that will make it easier to rewrite when the time comes since there won't be quite so many moving parts.

I was tempted to make it multiband supportable, as now I have to write stupid code like this to reconstitute my chopped pictures
and which was even more painful without the array ST_AddBand construct.

 
{{{
SELECT ST_AddBand(NULL, 
ARRAY[ST_Union(ST_Band(rast,1))
    , ST_Union(ST_Band(rast,2))
    , ST_Union(ST_Band(rast,3)) ] )
FROM samples.downtown_chunked 
}}}

"	task	closed	medium	PostGIS 2.1.0	raster	trunk	fixed	history