Bug 189706 Enhance computed column aggregation function handling in UI.
Due to the issue discussed in 189705, current computed column aggregation builder in data set editor has bugs to extend: 1.When new a computed column, the aggregation argument field cannot be correctly set. 2.The argument field cannot be correct grayed out when user select a aggregation function without arguments 3.The available aggregation function list is incomprehensive 4.Some aggregation function cannot be set to model(say, weightedAve).
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/executor/aggregation/AggregationHelper.java
.getGroupInformationUtil( )
			.getEndingGroupLevel( );
	*/}
	
	private int getCurrentGroupIndex( int groupLevel ) throws DataException
	{
		return this.populator.getResultIterator( ).getCurrentGroupIndex( groupLevel );
		/*return this.populator.getGroupProcessorManager( )
				.getGroupCalculationUtil( )
				.getGroupInformationUtil( )
				.getCurrentGroupIndex( groupLevel );*/
	}
	private int getCurrentResultIndex( ) throws DataException
	{
		return this.populator.getResultIterator( ).getCurrentResultIndex( );
	}
	
	private IResultObject getCurrentResult() throws DataException
	{
		return this.populator.getResultIterator( ).getCurrentResult( );
		
	}
	
	private void first( int groupLevel ) throws DataException
	{
		this.populator.getResultIterator( ).first( groupLevel );
		
	}
	
	/**