[postgis-tickets] [PostGIS] #3579: Backend crash with mixed collections

[PostGIS]

#3579: Backend crash with mixed collections
---------------------+---------------------------
 Reporter:  pramsey  |      Owner:  pramsey
     Type:  defect   |     Status:  new
 Priority:  blocker  |  Milestone:  PostGIS 2.2.3
Component:  postgis  |    Version:  2.2.x
 Keywords:           |
---------------------+---------------------------
 When called with a collection that include empty sub-components, the back-
 end may crash
 {{{
 with
         params as (
         select
             11 :: float as sidewalk_offset,
             1 :: float  as epsilon
     ),
         road as (
 -- L-shaped road, 10 m
         select 'SRID=3857;LINESTRING(10 0, 0 0, 0 10)' :: geometry as geom
     ),
         sidewalks as (
         select ST_Collect(
                    ST_OffsetCurve(geom, sidewalk_offset),
                    ST_OffsetCurve(geom, -sidewalk_offset)
                ) geom
         from road, params
     )
 select
     ST_Intersects(road.geom, sidewalks.geom),
 -- should be false
     ST_Intersects(ST_Buffer(road.geom, sidewalk_offset + epsilon),
 sidewalks.geom) -- should be true
 from road, sidewalks, params;
 }}}
 Originally reported on github at
 https://github.com/postgis/postgis/pull/105

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3579>
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