#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):

 Wait, I wasn't running your actual SQL. Please test *my* SQL on your
 setup, just to confirm that a "normal" union runs in OK time. Your SQL
 does a bunch of grouping, and I need to examine it a little to see what it
 is actually doing, in terms of which groups are taking all the time, and
 what they look like.

Ticket URL: <https://trac.osgeo.org/geos/ticket/997#comment:3>
GEOS <http://trac.osgeo.org/geos>
GEOS (Geometry Engine - Open Source) is a C++ port of the Java Topology Suite 
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