hsyuan opened a new pull request #1773: [CALCITE-3756] RelSubset should not 
match operand(RelNode.class)
URL: https://github.com/apache/calcite/pull/1773
 
 
   Even RelSubset is a subclass of RelNode, but they are quite different. 
RelNode
   already fires these rules, it is not necessary to fire for RelSubset. More
   importantly, it never worked due to CALCITE-3755.  In addition, it will waste
   time to try to iterate class operands of RelSubset and try to match pattern
   operand(RelNode), given that it never matches when ascending.

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