[PostGIS] #5781: Concave Hull returning multi poly with polygons

[PostGIS]

#5781: Concave Hull returning multi poly with polygons
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  Reporter:  latot    |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  medium   |  Milestone:  PostGIS GEOS
 Component:  postgis  |    Version:  3.4.x
Resolution:           |   Keywords:
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Comment (by mdavis):

 This is due to the current behaviour of the ConcaveHullOfPolygons
 algorithm in JTS/GEOS.  It allows the hull to be eroded past the point
 where the output is fully connected.  In contrast, the ConcaveHull
 algorithm for points ensures that the output is a single connected
 polygon.  I can't remember why this decision was made - perhaps it was
 just an oversight.  It should be possible to require that the output is
 fully connected.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5781#comment:4>
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