[postgis-users] Forcibly parallelizing very expensive st_unaryunion in sequential scan on 20 row MultiLineString Table

Martin Davis mtnclimb at gmail.com
Thu Nov 26 14:17:04 PST 2020

On Thu, Nov 26, 2020 at 2:14 PM Andrew Joseph <ap.joseph at live.com> wrote:

> st_linemerge doesn’t have the new gridsize parameter introduced in GEOS
> 3.9/Postgis 3.1 -so not an option since these linestrings need to be
> polygonized accurately.

 And ST_LineMerge doesn't do any noding or dissolving of lines, so it's not
an effective way to prepare linework for input to ST_Polygonize.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/postgis-users/attachments/20201126/84466259/attachment.html>

More information about the postgis-users mailing list