[postgis-tickets] [PostGIS] #3298: ST_3DClosestPoint, ST_3DLongestLine, ST_3DMaxDistance regression between 2.1.8 and 2.2.0rc1

[PostGIS]

#3298: ST_3DClosestPoint, ST_3DLongestLine, ST_3DMaxDistance  regression between
2.1.8 and 2.2.0rc1
----------------------+---------------------------
  Reporter:  robe     |      Owner:  nicklas
      Type:  defect   |     Status:  closed
  Priority:  high     |  Milestone:  PostGIS 2.2.0
 Component:  postgis  |    Version:  trunk
Resolution:  fixed    |   Keywords:
----------------------+---------------------------
Changes (by robe):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 Only thing left is a failure with tIN And empty geometries that used to
 return something in 2.1.  Not sure why that ever returned anything anyway
 and was only for the useless case of TIN and empty so we can ignore that.

 I am also seeing differences in answers between 2.1.8 and 2.2.0 which I am
 guessing are intentional. I think we just need to flag in the docs these
 functions changed behavior in case of 2D/3D, 2D/2D, 2d/2DM etc

 Example:


 {{{
 SELECT ST_AsText(ST_3DClosestPoint('POINT(-11.1111111 40)'::geometry,
 'POINT(-11.1111111 40)'::geometry));
 }}}

 - 2.1.8 answer

 {{{

 POINT Z (-11.1111111 40 0)
 }}}


 -- 2.2.0 answer

 {{{
 POINT(-11.1111111 40)
 }}}



 {{{ -- 2d and 3d line
 SELECT ST_AsText(ST_3DClosestPoint('LINESTRING(-11.1111111 70,70
 -11.1111111)'::geometry, 'LINESTRING Z (-10 40 1,-9 41 1)'::geometry ));
 }}}


 {{{
 -- 2.1.8 answer
 POINT Z (4.44444445 54.44444445 0)

 }}}


 {{{
 -- 2.2.0 answer

 POINT Z (4.44444445 54.44444445 1)

 }}}


 Is it okay for me to just throw a changed notice in the docs for all these
 functions something the effect


 ----
 Changed 2.2.0: In case of 2 2d geometries the function will return a 2d
 geometry instead of 3D with 0 for Z

 In case of 2d and 3d - the function will consider the 2D geometry as
 having a Z from 0 to infinity


 ----

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3298#comment:9>
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