[postgis-tickets] [PostGIS] #3306: ST_LineMerge drops vertical segments

[PostGIS]

#3306: ST_LineMerge drops vertical segments
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 Reporter:  bfreed3  |      Owner:  pramsey
     Type:  defect   |     Status:  new
 Priority:  medium   |  Milestone:  PostGIS 2.1.9
Component:  postgis  |    Version:  2.1.x
 Keywords:           |
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 SELECT ST_AsText(ST_LineMerge(ST_GeomFromText('MULTILINESTRING((0 0 0, 10
 10 10, 20 20 10),(20 20 10, 30 30 20, 30 30 40))')));

 The resulting Linestring has a Z dimension, but loses the vertical
 segments.

 This becomes a problem when tracking pipeline construction at places where
 vertical pipes branch off, for example.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3306>
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