asdfgh19 created CALCITE-5992:
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             Summary: Avoid comparing root Relsubset's TraitSet with itself
                 Key: CALCITE-5992
                 URL: https://issues.apache.org/jira/browse/CALCITE-5992
             Project: Calcite
          Issue Type: Improvement
          Components: core
            Reporter: asdfgh19
            Assignee: asdfgh19


Since VolcanoPlanner#root will definitely exist in the subsets collection of 
the Relset related to it, we can skip the comparison between the root Relsubset 
and itself.



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