I don't know about the polygonize stuff, but
Stefan Zweig a écrit :
is there maybe another way to insert the first point again after the last point?

Here you can use ST_AddPoint :

ST_AddPoint(linestring, point, [<position>])
Adds a point to a LineString before point <pos> (0-based index). Third 
parameter can be omitted or set to -1 for appending.

So "ST_AddPoint(the_geom, ST_PointN(the_geom, 1))" would return the_geom with 
its first point appended at the end.


Regards,
--
Arnaud
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