2.5D topology: Column has Z dimension but geometry does not

[strk]

  -- preparation
  select droptopology('t');
  select topology.createtopology('t',0,0,true) as topoid;
  select topogeo_addpolygon('t', 'POLYGON((0 0 0, 0 1 0, 1 1 0, 1 0 0, 0 0 0))');

  -- bug exposure
  select topogeo_addlinestring('t', 'LINESTRING(1 1 0,0 1 0,0 1 1,1 1 1,1 1 0)');

The culprit is ST_ClosestPoint, see ticket #2032 What we could do is re-add the Z to the output of ST_ClosestPoint.

[robe]

hmm why aren't you using ST_3DClosestPoint? ​http://www.postgis.org/documentation/manual-svn/ST_3DClosestPoint.html

[strk]

Because it won't give me 2d results when fed 2d input …

Anyway this case is closed with r10378 in 2.0 branch and r10381 in trunk.

[strk]

See also #3244

[strk]

oh, another reason why I don't use 3DClosestPoint is that I want the closest point in 2d, not in 3d