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  1. Calcite
  2. CALCITE-3909

RelMdMinRowCount doesn't take into account UNION DISTINCT

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      When computing minRowCount for Union, it doesn't task into account UNION DISTINCT.

      public Double getMinRowCount(Union rel, RelMetadataQuery mq) {
        double rowCount = 0.0;
        for (RelNode input : rel.getInputs()) {
          Double partialRowCount = mq.getMinRowCount(input);
          if (partialRowCount != null) {
            rowCount += partialRowCount;
          }
        }
        return rowCount;
      }
      

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              • Assignee:
                Chunwei Lei Chunwei Lei
                Reporter:
                Chunwei Lei Chunwei Lei
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