This function merges an array of pcpatch entries into a pcpatch object.
Syntax
pcpatch ST_union(pcpatch[] pcs);
Parameters
Parameter | Description |
---|---|
pcs | The pcpatch array. |
Examples
-- Compare npoints(sum(patches)) with sum(npoints(patches)).
SELECT ST_NumPoints(ST_Union(pa)) FROM patches;
SELECT Sum(ST_NumPoints(pa)) FROM patches;
100