[PostGIS] #6123: ST_MakeSimple

[PostGIS]

#6123: ST_MakeSimple
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 Reporter:  strk         |      Owner:  pramsey
     Type:  enhancement  |     Status:  new
 Priority:  medium       |  Milestone:  PostGIS 3.8.0
Component:  postgis      |    Version:  master
 Keywords:               |
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 The ST_MakeValid function internally would be able to turn a collapsed
 linestring into a simple one, but `ST_MakeValid` never does it unless the
 linestring is a ring of a polygon (because by definition a linestring is
 never invalid).

 An ST_MakeSimple function could deal with the non-simple linestring case
 in a clear way, that is using the same promise of MakeValid (not loosing
 vertices, adding intersection points, splitting when needed, dropping
 collapses) but for lines.

 Such a function (at liblwgeom level, not necessarely at SQL level) would
 be useful for topology.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6123>
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