[postgis-tickets] [PostGIS] #4770: [raster] Calling st_union() with WINDOW PARTITION crashes server

[PostGIS]

#4770: [raster] Calling st_union() with WINDOW PARTITION crashes server
----------------------+---------------------------
  Reporter:  Robins   |      Owner:  robe
      Type:  defect   |     Status:  new
  Priority:  blocker  |  Milestone:  PostGIS 3.0.4
 Component:  raster   |    Version:  3.0.x
Resolution:           |   Keywords:  st_union
----------------------+---------------------------

Comment (by pramsey):

 It's very odd, the implementations of the transfns between union(geom) and
 union(rast) is functionally identical, and the problem is in fact that in
 the raster case pgsql itself is calling the transfn in a bogus state...
 promising a populated aggcontext while providing an empty one. There's
 something very odd going on in an interaction with pgsql.

 Smaller reproduction:
 {{{
 SELECT
  PUBLIC.st_union(NULL::raster) OVER (ORDER BY b)
 FROM (VALUES (300), (302)) t(b);
 }}}

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4770#comment:8>
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