[postgis-tickets] [PostGIS] #4956: ST_Boundary(colllection) -> ERROR: MultiLineString cannot contain MultiLineString element

[PostGIS]

#4956: ST_Boundary(colllection) -> ERROR:  MultiLineString cannot contain
MultiLineString element
---------------------+---------------------------
 Reporter:  strk     |      Owner:  pramsey
     Type:  defect   |     Status:  new
 Priority:  medium   |  Milestone:  PostGIS 3.2.0
Component:  postgis  |    Version:  main
 Keywords:           |
---------------------+---------------------------
 Confusing error from this query:
 {{{
 select ST_Boundary('GEOMETRYCOLLECTION(POLYGON((0 0,0 10,10 10,10 0,0
 0),(2 2,4 2,4 4,2 4,2 2)),POLYGON((2 2,2 4,4 4,4 2,2 2)))'::geometry);
 }}}

 Note that if the first polygon doesn't have an hole the routine returns an
 answer. Pretty confusing ...

 This only happens in 3.2.0dev, as in the 3.1 branch we get a nice and
 understandable message:
 {{{ ERROR:  GEOSBoundary: IllegalArgumentException: Operation not
 supported by GeometryCollection }}}

 Both installs are using GEOS-3.10.0dev

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4956>
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