[geos-devel] [GEOS] #997: ST_Union performance degradation from GEOS 3.6.x -> 3.7.x

[GEOS]

#997: ST_Union performance degradation from GEOS 3.6.x -> 3.7.x
-------------------------+---------------------------
 Reporter:  greenlaw     |       Owner:  geos-devel@…
     Type:  defect       |      Status:  new
 Priority:  major        |   Milestone:
Component:  Default      |     Version:  3.7.0
 Severity:  Significant  |  Resolution:
 Keywords:  union        |
-------------------------+---------------------------

Comment (by pramsey):

 I have reduced the problem to the minimum number of geometries. With the
 uniontest table from
 https://www.dropbox.com/s/la1g0xbvbdc849l/uniontest.sql.gz?dl=1 you can
 run
 {{{
 SELECT ST_Union(geom) FROM uniontest
 }}}
 and see the effect. It's quite particular to these geometries. On that
 basis I am not going to delay the 3.8.0 release, and hope we can find the
 particular cause of the regression to patch up 3.8.1 and the 3.7 branch.

-- 
Ticket URL: <https://trac.osgeo.org/geos/ticket/997#comment:5>
GEOS <http://trac.osgeo.org/geos>
GEOS (Geometry Engine - Open Source) is a C++ port of the Java Topology Suite (JTS).