Hi, I try
select 1 as id, st_union(a.geom) as geom from public._postgis_selezione_ok as a ; It seem work pretty fast and result seem ok. Andrea.
I'm trying to apply ST_Union on a set of geometries (multypolygons, most of which containing a single geometry), to test the CascadedUnion performance, but the most of times it returns a null result. I haven't been able to find a rule: sometimes it seems to be the number of geometries, sometimes the order, etc. Could someone replicate it? Here is a small selection of my layer (it contains already validated geometries): http://www.giovanniallegri.it/share/postgis_selection.zip thanks a lot, Giovanni
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