[PostGIS] #5953: Slow st_intersection with big input polygons

[PostGIS]

#5953: Slow st_intersection with big input polygons
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  Reporter:  Lars Aksel Opsahl  |      Owner:  pramsey
      Type:  enhancement        |     Status:  new
  Priority:  medium             |  Milestone:  PostGIS 3.6.0
 Component:  postgis            |    Version:  master
Resolution:                     |   Keywords:
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Comment (by mdavis):

 Another idea is to take advantage of the efficient PostGIS spatial
 relationship filtering (via prepared queries and the new RelateNG code)
 and only perform the intersection when a target polygon is not covered by
 the large polygon.  If a substantial fraction of the target polygons lie
 inside the large polygon, this might provide a speed-up.

 This will require reformulating the query so that `ST_Covers` can be used
 as the first spatial filter (and ensuring that it is able to operate in
 prepared mode).
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5953#comment:6>
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