[postgis-tickets] [PostGIS] #4856: ST_Intersection error

[PostGIS]

#4856: ST_Intersection error
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 Reporter:  ezimanyi  |      Owner:  pramsey
     Type:  defect    |     Status:  new
 Priority:  medium    |  Milestone:  PostGIS 2.5.6
Component:  postgis   |    Version:  2.5.x
 Keywords:            |
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 I obtained the following error when I apply twice the ST_Intersection
 function


 {{{
 select st_astext(st_intersection(geometry 'Linestring(1 1,3 3.5,3 3)',
 geometry 'Polygon((0 0,0 3,3 3,3 0,0 0))'));
 -- GEOMETRYCOLLECTION(POINT(3 3),LINESTRING(1 1,2.6 3))

 select st_astext(st_intersection(geometry 'Linestring(1 1,3 3.5,3 3)',
 geometry 'GEOMETRYCOLLECTION(POINT(3 3),LINESTRING(1 1,2.6 3))'));
 -- MULTIPOINT(1 1,3 3)

 select postgis_full_version();
 POSTGIS="3.0.3 6660953" [EXTENSION] PGSQL="130" GEOS="3.9.1dev-
 CAPI-1.14.1" PROJ="7.0.0" LIBXML="2.9.4" LIBJSON="0.12.1"

 }}}


 The result above `MULTIPOINT(1 1,3 3)` is an error. I have tested also
 with 2.5.5 and GEOS 3.8 and the result is the same.

-- 
Ticket URL: <https://trac.osgeo.org/postgis/ticket/4856>
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