/**
 * Applies a Project transformation on a {@link Tuple} {@link DataSet}.
 *
 * <p><b>Note: Only Tuple DataSets can be projected using field indexes.</b>
 *
 * <p>The transformation projects each Tuple of the DataSet onto a (sub)set of fields.
 *
 * <p>Additional fields can be added to the projection by calling {@link ProjectOperator#project(int[])}.
 *
 * <b>Note: With the current implementation, the Project transformation looses type information.</b>
 *
 * @param fieldIndexes The field indexes of the input tuple that are retained.
 * 					   The order of fields in the output tuple corresponds to the order of field indexes.
 * @return A ProjectOperator that represents the projected DataSet.
 *
 * @see Tuple
 * @see DataSet
 * @see ProjectOperator
 */
public <OUT extends Tuple> ProjectOperator<?, OUT> project(int... fieldIndexes) {
	return new Projection<>(this, fieldIndexes).projectTupleX();
}
 

/**
 * Applies a Project transformation on a {@link Tuple} {@link DataSet}.
 *
 * <p><b>Note: Only Tuple DataSets can be projected using field indexes.</b>
 *
 * <p>The transformation projects each Tuple of the DataSet onto a (sub)set of fields.
 *
 * <p>Additional fields can be added to the projection by calling {@link ProjectOperator#project(int[])}.
 *
 * <b>Note: With the current implementation, the Project transformation looses type information.</b>
 *
 * @param fieldIndexes The field indexes of the input tuple that are retained.
 * 					   The order of fields in the output tuple corresponds to the order of field indexes.
 * @return A ProjectOperator that represents the projected DataSet.
 *
 * @see Tuple
 * @see DataSet
 * @see ProjectOperator
 */
public <OUT extends Tuple> ProjectOperator<?, OUT> project(int... fieldIndexes) {
	return new Projection<>(this, fieldIndexes).projectTupleX();
}
 

/**
 * Applies a Project transformation on a {@link Tuple} {@link DataSet}.
 *
 * <p><b>Note: Only Tuple DataSets can be projected using field indexes.</b>
 *
 * <p>The transformation projects each Tuple of the DataSet onto a (sub)set of fields.
 *
 * <p>Additional fields can be added to the projection by calling {@link ProjectOperator#project(int[])}.
 *
 * <b>Note: With the current implementation, the Project transformation looses type information.</b>
 *
 * @param fieldIndexes The field indexes of the input tuple that are retained.
 * 					   The order of fields in the output tuple corresponds to the order of field indexes.
 * @return A ProjectOperator that represents the projected DataSet.
 *
 * @see Tuple
 * @see DataSet
 * @see ProjectOperator
 */
public <OUT extends Tuple> ProjectOperator<?, OUT> project(int... fieldIndexes) {
	return new Projection<>(this, fieldIndexes).projectTupleX();
}