[postgis-tickets] [PostGIS] #4550: st_asmvtgeom sometimes returns null for valid geometries (postgis 2.5.3)

[PostGIS]

#4550: st_asmvtgeom sometimes returns null for valid geometries (postgis 2.5.3)
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  Reporter:  anneb    |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  medium   |  Milestone:  PostGIS 2.5.4
 Component:  postgis  |    Version:  2.5.x
Resolution:           |   Keywords:  st_asmvtgeom
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Comment (by Algunenano):

 This is a known limitation that comes from the interaction between the MVT
 transformation and the validation process. It might happen that the MVT
 transformation produces an invalid polygon and the validation step changes
 its coordinates to decimal to fix it, which requires us to go back the
 transformation step again. No matter how much I've tuned the process
 (changed parameters, reorder operations, etc) there are some,situations
 that we can't fix, so we return NULL.

 This has been addressed in the 3.0 release by using a different backend
 (Wagyu), which not only fixes this problem but it also can give 30x
 performance in cases like this.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4550#comment:1>
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