How to use

IntersectOperator

in

org.qcri.rheem.basic.operators

/**
 * Provides the type of input and output datasets.
 *
 * @return the {@link DataSetType}
 */
public DataSetType<Type> getType() {
  return this.getInputType0();
}

private SubplanPattern createSubplanPattern() {
  final OperatorPattern operatorPattern = new OperatorPattern<>(
      "intersect", new IntersectOperator<>(DataSetType.none()), false
  );
  return SubplanPattern.createSingleton(operatorPattern);
}

  @Override
  public Optional<CardinalityEstimator> createCardinalityEstimator(
      final int outputIndex,
      final Configuration configuration) {
    Validate.inclusiveBetween(0, this.getNumOutputs() - 1, outputIndex);
    // The current idea: We assume that one side is duplicate-free and included in the other.
    // TODO: Find a better estimator.
    return Optional.of(new DefaultCardinalityEstimator(
        .5d, 2, this.isSupportingBroadcastInputs(),
        inputCards -> Math.min(inputCards[0], inputCards[1])
    ));
  }
}

private SubplanPattern createSubplanPattern() {
  final OperatorPattern operatorPattern = new OperatorPattern<>(
      "intersect", new IntersectOperator<>(DataSetType.none()), false
  );
  return SubplanPattern.createSingleton(operatorPattern);
}