[postgis-tickets] [PostGIS] #3462: Document populate_topology_layer

[PostGIS]

#3462: Document populate_topology_layer
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 Reporter:  strk           |      Owner:  robe
     Type:  defect         |     Status:  new
 Priority:  medium         |  Milestone:  PostGIS 2.3.0
Component:  documentation  |    Version:  trunk
 Keywords:  topology       |
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 The function was added with r14432 (for 2.3,0) but did not come with
 documentation.

 It's what populate_geometry_columns used to be for geometries, but for
 topology layers. Looking at constraints it'll guess what layers were
 available. It fails to determine hierarchies as no constraints are set for
 those layers.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3462>
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