[jira] [Created] (CALCITE-3757) When merging sets, relnodes may be reregistered multiple times

["Haisheng Yuan (Jira)" <ji...@apache.org>]

Haisheng Yuan created CALCITE-3757:
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             Summary: When merging sets, relnodes may be reregistered multiple times
                 Key: CALCITE-3757
                 URL: https://issues.apache.org/jira/browse/CALCITE-3757
             Project: Calcite
          Issue Type: Bug
          Components: core
            Reporter: Haisheng Yuan


In RelSet#mergeWith(), 

{code:java}
// merge subsets
    for (RelSubset otherSubset : otherSet.subsets) {
      ......
      for (RelNode otherRel : otherSubset.getRels()) {
        planner.reregister(this, otherRel);
      }
    }
{code}

otherSubset.getRels() returns all the rels that satisfy the traitset. A relnode's traitset may satisfy many traitsets, hence it will be reregistered multiple times.



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