[postgis-tickets] [PostGIS] #4639: Can't upgrade from 3.0.0alpha3 to 3.1.0dev (cannot drop function pgis_geometry_union_transfn)

[PostGIS]

#4639: Can't upgrade from 3.0.0alpha3 to 3.1.0dev (cannot drop function
pgis_geometry_union_transfn)
----------------------+---------------------------
  Reporter:  strk     |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  blocker  |  Milestone:  PostGIS 3.1.0
 Component:  postgis  |    Version:  master
Resolution:           |   Keywords:  upgrade
----------------------+---------------------------

Comment (by strk):

 Commit [75a044c6141b64ed3357e766cdb48f7b40bd4867/git] restored old
 signature to avoid a DROP of the aggregate on upgrade, but leaving the
 interim installs (like mine) out in the dark (cannot upgrade, due to the
 lack of drop). We'd need a better strategy to deal with these cases.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4639#comment:5>
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