[postgis-tickets] [PostGIS] #4252: Revise gidx_merge behavior with unknown

[PostGIS]

#4252: Revise gidx_merge behavior with unknown
-------------------------+---------------------------
 Reporter:  komzpa       |      Owner:  Komzpa
     Type:  enhancement  |     Status:  assigned
 Priority:  medium       |  Milestone:  PostGIS 3.0.0
Component:  postgis      |    Version:  trunk
 Keywords:               |
-------------------------+---------------------------
 Spin off #4139

 In gserialized_gist_nd there are two conflicting clauses:

  * gidx_unknown is a gidx with 0 dimensions, and considered to include
 nothing;

  * an unshared dimension is considered to be "true" for any spatial
 relation.

 Also volume/edge of unknown gidx is considered 0 when it could be infinity
 which may lead to better trees.

 Evaluation whether we need to special case gidx_unknown is needed

-- 
Ticket URL: <https://trac.osgeo.org/postgis/ticket/4252>
PostGIS <http://trac.osgeo.org/postgis/>
The PostGIS Trac is used for bug, enhancement & task tracking, a user and developer wiki, and a view into the subversion code repository of PostGIS project.