[PostGIS] #5572: ST_Difference drops z-dimension on empty result

[PostGIS]

#5572: ST_Difference drops z-dimension on empty result
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  Reporter:  lkajan   |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  medium   |  Milestone:  PostGIS 3.3.6
 Component:  postgis  |    Version:  3.4.x
Resolution:           |   Keywords:
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Comment (by pramsey):

 Hum, this has been fixed at some point, either in PostGIS or GEOS (I'm
 guessing the latter).
 {{{
 # SELECT ST_AsText(ST_Difference('LINESTRINGZ(0 0 0,1 0 0)'::geometry,
 'LINESTRINGZ(0 0 0,1 0 0)'::geometry));
      st_astext
 --------------------
  LINESTRING Z EMPTY
 }}}
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5572#comment:2>
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