wutiangan opened a new pull request #4150:
URL: https://github.com/apache/incubator-doris/pull/4150


   fix #4149
   
   add sessionVariable "prefer_broadcast_join" to choose broadcastjoin first 
when cardinality cannot be estimated
   the sessionVariable can set local or global. the default value is true, 
prefer broadcast join first where the two cost is equal.
   


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