wangyum commented on PR #37048:
URL: https://github.com/apache/spark/pull/37048#issuecomment-1180460255

   > OK, but your approach doesn't fix all the issues. With AQE, a complicated 
query may have run for a while and the cartesian product fails in the last 
query stage.
   
   Yes. This is mainly to prevent a bad query affecting the stability of the 
thrift server. Another case is: `a join b on a.id = b.id = a.name = b.name`, 
https://github.com/apache/spark/pull/29728


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