Kontinuation commented on PR #562:
URL: https://github.com/apache/sedona-db/pull/562#issuecomment-3889499099

   I need to clarity that this PR does not change the behavior of filter 
pushdown for KNN joins. The original problems with KNN joins remain the same, 
and users still need to use barriers to explicitly workaround that problem.
   
   This PR mainly fixes the correctness of plan properties of SpatialJoinExec, 
and avoid breaking the plan property requirements during the physical plan -> 
physical plan transformation, which may result in physical plan sanity check 
failures or silently producing incorrect results.
   
   The optimization rules for merging filter into Join node and converting Join 
nodes to SpatialJoinPlanNode all happen after DataFusion's builtin optimization 
passes, so filter pushdown still behave the same as before.


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