[postgis-tickets] [PostGIS] #4127: ST_Dimension returns 0 for empty GeometryCollection

[PostGIS]

#4127: ST_Dimension returns 0 for empty GeometryCollection
----------------------+---------------------------
 Reporter:  esparano  |      Owner:  pramsey
     Type:  defect    |     Status:  new
 Priority:  medium    |  Milestone:  PostGIS 2.4.5
Component:  postgis   |    Version:  2.4.x
 Keywords:            |
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 The documentation says that ST_Dimension should return 0 for Points and
 NULL for empty geometries. However, there appears to be a bug in the code
 where ST_Dimension return 0 for empty collections.

 I would suggest changing line 1033 of lwgeom.c from:

 {{{
 int maxdim = 0, i;
 }}}

 to:

 {{{
 int maxdim = -1, i;
 }}}

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4127>
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