[PostGIS] #1247: [raster] ST_AsRaster aggregate function

[PostGIS]

#1247: [raster] ST_AsRaster aggregate function
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  Reporter:  robe         |      Owner:  strk
      Type:  enhancement  |     Status:  assigned
  Priority:  medium       |  Milestone:  PostGIS 3.6.0
 Component:  raster       |    Version:  master
Resolution:               |   Keywords:
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Comment (by strk):

 I went with the extended version:
 {{{
 ST_AsRasterAgg(
  geom geometry,
  val float8,
  ref raster,
  pixeltype text,
  nodataval float8,
  uniontype text,
  touched boolean
 )
 }}}

 The aggregate burns each incoming geometry to a raster having the origin
 and scale specified by the reference raster and unions it to the state
 raster using the specified uniontype.

 If we all agree on the signature I'll proceed with documentation
-- 
Ticket URL: <https://trac.osgeo.org/postgis/ticket/1247#comment:15>
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