[PostGIS] #5815: hash operator error

[PostGIS]

#5815: hash operator error
----------------------+---------------------------
  Reporter:  robe     |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  blocker  |  Milestone:  PostGIS 3.5.1
 Component:  postgis  |    Version:  3.4.x
Resolution:           |   Keywords:
----------------------+---------------------------
Comment (by pramsey):

 New and exciting error. On 3.4 it's a different error. So this may have
 never worked, and is now just failing in a different way.
 {{{
 postgis34=# WITH lines AS (SELECT ST_GeomFromText('LINESTRING(1 2, 3 4)')
 AS geom
  UNION ALL
   SELECT  ST_GeomFromText('LINESTRING(6 5, 7 8)') AS geom
  )
  SELECT t1.geom, t2.geom
  FROM lines AS t1, lines AS t2
  WHERE t1.geom <> t2.geom;

 ERROR:  operator is not unique: geometry <> geometry
 LINE 7: WHERE t1.geom <> t2.geom;                      ^
 HINT:  Could not choose a best candidate operator. You might need to add
 explicit type casts.
 }}}
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5815#comment:4>
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