zhuwenzhuang opened a new pull request, #4803:
URL: https://github.com/apache/calcite/pull/4803

   Motivation and details: https://issues.apache.org/jira/browse/CALCITE-7422
   Before:
   LargePlanBenchmark:100 : 1s
   LargePlanBenchmark:1000 : 9s
   LargePlanBenchmark:10000 :  pretty slow, cannot measure.
   
   After:
   LargePlanBenchmark:100 : 1s
   LargePlanBenchmark:1000 : 2s
   LargePlanBenchmark:10000 : about 60s
   
   Benchmark                              (unionNum)  Mode  Cnt      Score   
Error  Units
   LargePlanBenchmark.testLargeUnionPlan         100  avgt         256.561      
    ms/op
   LargePlanBenchmark.testLargeUnionPlan        1000  avgt        1616.421      
    ms/op
   LargePlanBenchmark.testLargeUnionPlan       10000  avgt       53393.727      
    ms/op


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