#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
 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>
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