名称
TopoElement — 将拓扑几何转换为拓扑元素。
概要
topoelement TopoElement(topogeometry topo);
示例
这是一个完整的自包含工作流程
-- do this if you don't have a topology setup already
-- Creates topology not allowing any tolerance
SELECT TopoElement(topo)
FROM neighborhoods;
-- using as cast
SELECT topology.TopoElementArray_Agg(topo::topoelement)
FROM neighborhoods
GROUP BY city;