基于代理方案中，在用户节点所在初始区域中确定一个代理节点，当用户节点迁出该区域前，代理节点监测用户节点所在的位置并在聚集结果到来时把该结果路由给用户节点；

AS scheme determines the region where the sender originally located, before it moves out, it searches an agent node located in the same original region to monitor and forward result to the sender.

youdao

PDGP分区组跨越数据节点，这是表空间所在的位置。

The PDGP partition group spans the data nodes, which is where the table Spaces are placed.

youdao

否则，将没有节点旋转到顶端节点原来所在的位置。

Otherwise there's nothing to rotate into the top spot.

youdao