[postgis-tickets] [PostGIS] #4348: Invalid geometry out of ST_AsMVTGeom

[PostGIS]

#4348: Invalid geometry out of ST_AsMVTGeom
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  Reporter:  Algunenano  |      Owner:  Algunenano
      Type:  defect      |     Status:  assigned
  Priority:  medium      |  Milestone:  PostGIS 2.5.3
 Component:  postgis     |    Version:  2.5.x
Resolution:              |   Keywords:
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Comment (by Algunenano):

 The issue wasn't in ST_MakeValid, but on gridding the geometry after
 making it valid (needed to remove float coordinates). I've needed pretty
 significant changes to fix this, which was a PITA since Wagyu was already
 working correctly with this input.


 The full PR and explication is in
 https://github.com/postgis/postgis/pull/382 but essentially since we are
 making polygons invalid in the process, I opted for auto fix them when the
 clipping goes awry, and applied several changes (new grid algorithm,
 iterative grid + validation) to make sure everything is clean on output
 and minimize the cost of the validation itself.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4348#comment:1>
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