[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 strk):

 Right, that's my proposal: don't drop but just mark parallel.
 In order to do this automatically we need to remove the
 "Changed:" label from {{{ CREATE AGGREGATE }}} comment
 so that the script will not DROP it ( or change to "Changed
 Compatibly" or something like that, which doens't trigger
 the restart )  and do the PARALLEL bit in next statement,
 with direct catalog access.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3821#comment:17>
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