[PostGIS] #5701: topology crashing under PG17

[PostGIS]

#5701: topology crashing under PG17
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  Reporter:  robe      |      Owner:  strk
      Type:  defect    |     Status:  new
  Priority:  blocker   |  Milestone:  PostGIS 3.5.0
 Component:  topology  |    Version:  master
Resolution:            |   Keywords:
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Comment (by robe):

 I'm guessing it's the UNION change because the query crashing is:

 {{{
 CREATE TEMP TABLE edge1_endnodes AS
   WITH edge AS (
     SELECT start_node, end_node
     FROM sqlmm_topology.edge_data
     WHERE edge_id = 1
   )
   SELECT start_node id FROM edge UNION
   SELECT end_node FROM edge;
 }}}

 Seems harmless enough
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5701#comment:2>
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