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
}
			assert this.getCurrentResultIndex( ) == 0;
			if ( this.getCurrentResult( ) == null )
			{
				
				return;
			}
			pass( populateAggrValue, validAggregationArray );
			
			this.first( 0 );
			count++;
			prepareNextIteration( validAggregations, populateAggrValue, count );
		}
	}
	
	/**
	 * Make a pass to all aggregations. Iterator over entire result set. At each row, call
	 * each aggregate aggregationtion.
	 * 
	 * @param scope
	 * @param populateAggrValue
	 * @param validAggregationArray
	 * @throws DataException
	 */
	private void pass( boolean[] populateAggrValue,
			int[] validAggregationArray ) throws DataException
	{
		do
		{
			int startingGroupLevel = this.getStartingGroupLevel( );