[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:  new
  Priority:  medium       |  Milestone:  PostGIS 2.5.0
 Component:  postgis      |    Version:  2.3.x
Resolution:               |   Keywords:
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Comment (by nextstopsun):

 Can you give some more details about the update process?
 `st_union` can't be dropped in separate transaction, because postgis
 extension depends on it.
 Dropping the whole postgis extension means I have to drop almost
 everything in my DB.

 So dropping and recreation of `st_union` has to be in one transaction,
 right?
 Then why does it throw error when dropping it without reaching the end of
 transaction.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3821#comment:6>
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