liyafan82 opened a new pull request #2079:
URL: https://github.com/apache/calcite/pull/2079


   See https://issues.apache.org/jira/browse/CALCITE-4126
   
   The reason for stack overflow is that the JoinCommuteRule swaps children 
indiscriminately, which results in endless firing of the rule.
   
   To solve the problem, we modify the rule so that the children are swapped 
only when some conditions are satisfied. 


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