[postgis-tickets] [PostGIS] #3253: ST_3DMaxDistance curved geometries mixed dimension yields DIST_MAX mode not supported

[PostGIS]

#3253: ST_3DMaxDistance curved geometries mixed dimension yields DIST_MAX mode not
supported
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  Reporter:  robe     |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  low      |  Milestone:  PostGIS 2.2.0
 Component:  postgis  |    Version:  trunk
Resolution:           |   Keywords:
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Comment (by nicklas):

 ST_MaxDistance actually supports curves. But the function isn't aware of
 that. If works becasue all geoemtries to ST_MaxDistance goaes through
 ST_ConvexHull and then curves becomes polygons.

 But 3D is another story because ST_Convexhull would take away nessecary
 information for 3Dcalculations since ST_ConvexHull isn't 3D aware.

 Anyway. The fix in this case is to catch curves in the mixed
 dimentionality case before sending to 2D calc.
 This is done in r13970

 Or actually i only let Points, Lines and Polygons get through.

 It doesn't affect cases with 2 3D geoemtries but only when at least 1 of
 the geometries only have 2 dims.

 Otherwise those curves will be cached later in the process. But
 collections of different kinds with mixed dimmentionality is also
 affected. Because they are not evaluted yet when I do the check. Maybe
 have to redo that thing :-(
 What do you think
 Is it important that collections in the mixed dimmentionality case is let
 through?

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/3253#comment:4>
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