[postgis-tickets] [PostGIS] #3821: Don't drop st_union when updating postgis extension to 2.4

[PostGIS]

#3821: Don't drop st_union when updating postgis extension to 2.4
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  Reporter:  nextstopsun  |      Owner:  robe
      Type:  defect       |     Status:  closed
  Priority:  medium       |  Milestone:  PostGIS 2.4.0
 Component:  postgis      |    Version:  2.3.x
Resolution:  fixed        |   Keywords:
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Comment (by robe):

 Someone complained about this recently so putting a note here for others
 who stumble on this ticket

 Going from PostGIS 2.4 -> 2.5 requires a drop aggregate -- so sadly yes
 you'll need to rebuild your views.

 However come PostGIS 3.0 / PostgreSQL 12 with the introduction of CREATE
 OR REPLACE AGGREGATE, you should be able to go from PostGIS 2.anything to
 PostGIS 3.0 per #4352 without having to rebuild your views

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3821#comment:24>
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