jiayuasu commented on PR #1526:
URL: https://github.com/apache/sedona/pull/1526#issuecomment-2237757358

   > @jiayuasu I noticed that after switching from geo.buffer to 
OverlayNGRobust.union, the complex geometry representation returned from 
ST_Union_Aggr might change due to the reordering of polygon/polyline vertex. 
For example:
   > 
   > New: POLYGON ((1 0, 0 0, 0 1, 1 1, 2 1, 2 0, 1 0))
   > 
   > Old: POLYGON ((0 0, 0 1, 1 1, 2 1, 2 0, 1 0, 0 0))
   > 
   > They represent the same polygon, but the vertex order has changed.
   
   I think this is fine.
   
   In addition, we want to make sure the behavior of ST_Union_Aggr is similar 
to PostGIS ST_Union (array variant): https://postgis.net/docs/ST_Union.html


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