Bug 189534 Computed Column aggregation builder doesn't accept argument.
The aggregation builder of computed column should be enhanced so that 1. It can accept aggregation argument. 2. Only when the selected computed column can accept argument should the argument dialog enabled.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/executor/transform/pass/DataSetProcessUtil.java
* @param filterByRow
	 * @param psController
	 */
	private DataSetProcessUtil( ResultSetPopulator populator,
			ComputedColumnsState iccState,
			ComputedColumnHelper computedColumnHelper,
			FilterByRow filterByRow,
			PassStatusController psController,
			DataEngineSession session)
	{
		super( populator,
				iccState,
				computedColumnHelper,
				filterByRow,
				psController, session);
	}
	
	/**
	 * Populate the data set data of an IResultIterator instance.
	 * 
	 * @param populator
	 * @param iccState
	 * @param computedColumnHelper
	 * @param filterByRow
	 * @param psController
	 * @throws DataException
	 */
	public static void doPopulate( ResultSetPopulator populator, ComputedColumnsState iccState,
			ComputedColumnHelper computedColumnHelper, FilterByRow filterByRow,
			PassStatusController psController, DataEngineSession session ) throws DataException