[PostGIS] #2993: Reduce updates on topology building

[PostGIS]

#2993: Reduce updates on topology building
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  Reporter:  strk         |      Owner:  strk
      Type:  enhancement  |     Status:  new
  Priority:  medium       |  Milestone:  PostGIS Fund Me
 Component:  topology     |    Version:  master
Resolution:               |   Keywords:  performance
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Comment (by strk):

 Another source of excessive updates is the policy of assigning a new
 identifier to the face on the _left_ of the edge that happen to split an
 existing face. When the left side of the new ring is the _external_ part
 of it, the number of edges to be updated is more likely to be bigger than
 the number of updates (although not necessarely so).
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/2993#comment:4>
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