[postgis-tickets] [PostGIS] #2634: geography regression failure ST_DWithin/ST_Distance between 2.0.4 and 2.1.2 for dimensional mix of geographies

[PostGIS]

#2634: geography regression failure ST_DWithin/ST_Distance between 2.0.4 and 2.1.2
for dimensional mix of geographies
----------------------+-----------------------------------------------------
 Reporter:  robe      |       Owner:  pramsey      
     Type:  defect    |      Status:  new          
 Priority:  critical  |   Milestone:  PostGIS 2.1.2
Component:  postgis   |     Version:  2.1.x        
 Keywords:            |  
----------------------+-----------------------------------------------------

Comment(by robe):

 Hmm haven't gotten 2.1.0 to give an unstable answer for below even after
 10 attempts
 PostgreSQL 9.2.4, compiled by Visual C++ build 1600, 32-bit POSTGIS="2.1.0
 r11822" GEOS="3.4.2-CAPI-1.8.2 r0" PROJ="Rel. 4.8.0, 6 March 2012"
 GDAL="GDAL 1.10.0, released 2013/04/24" LIBXML="2.7.8" LIBJSON="UNKNOWN"
 RASTER

 {{{
 SELECT t1.gid As t1_gid, t2.gid As t2_gid
  , ST_DWithin(t1.geog, t2.geog,100)
  , ST_Distance(t1.geog, t2.geog) As dist
 FROM test_geogs As t1 CROSS JOIN test_geogs As t2;

  t1_gid | t2_gid | st_dwithin | dist
 --------+--------+------------+------
       1 |      1 | t          |    0
       1 |      2 | t          |    0
       2 |      1 | t          |    0
       2 |      2 | t          |    0
 }}}

 I do however get the same screwy answers for:


 {{{
 with geogp(gid, geog) AS (VALUES (1, 'POINT(-11.1111111 40)'::geography),
 (1, 'POINT(-11.1111111 40)'::geography))
  , geoglm (gid, geog) AS (VALUES
       (3, 'LINESTRING M (-10 50 1,50 -10 1)'::geography),
      (4, 'LINESTRING M (-10 50 2,50 -10 2)'::geography) )
 SELECT geogp.gid As p_gid, geoglm.gid As lm_gid,  ST_Distance(geogp.geog,
 geoglm.geog,false) As dist
  , _ST_DistanceUncached(geogp.geog, geoglm.geog, false) As distunc
  FROM geogp CROSS JOIN geoglm ;

  p_gid | lm_gid |       dist       |     distunc
 -------+--------+------------------+-----------------
      1 |      3 |  1010519.2194355 | 1010519.2194355
      1 |      4 | 1011346.61455377 | 1010519.2194355
      1 |      3 | 1011346.61455377 | 1010519.2194355
      1 |      4 | 1011346.61455377 | 1010519.2194355
 }}}

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/2634#comment:12>
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