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

Andrew Joseph ap.joseph at live.com
Thu Nov 26 14:14:05 PST 2020


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.

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