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

[Martin Davis]

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.
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