[postgis-tickets] [PostGIS] #3784: Difference of unioned geometries

[PostGIS]

#3784: Difference of unioned geometries
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 Reporter:  jendrusk  |      Owner:  pramsey
     Type:  defect    |     Status:  new
 Priority:  medium    |  Milestone:
Component:  postgis   |    Version:  2.2.x
 Keywords:            |
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 I'm merging two geometries into one using st_union then st_difference with
 third geom which is epsg:2180 extend to get a mask.
 Union returns one polygon with shape of joined two geoms but difference
 produces hole in shape of one of joined geometries. If I add st_buffer
 everything is ok.

 geometries in addition

 POSTGIS="2.2.1 r14555" GEOS="3.5.0-CAPI-1.9.0 r4084" PROJ="Rel. 4.9.2, 08
 September 2015" GDAL="GDAL 1.11.3, released 2015/09/16" LIBXML="2.9.3"
 LIBJSON="0.11.99" RASTER

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3784>
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