Esempio n. 1
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  // implement RelNode
  public RelOptCost computeSelfCost(RelOptPlanner planner) {
    double dRows = RelMetadataQuery.getRowCount(this);

    // Assume CPU is negligible since values are precomputed.
    double dCpu = 1;
    double dIo = 0;
    return planner.makeCost(dRows, dCpu, dIo);
  }