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/impl/ComputedColumnHelper.java
throw DataException.wrap( e );
		}
	}
	/**
	 * 
	 * @param nameList
	 * @param dataSetCCList
	 * @return
	 * @throws DataException
	 */
	private boolean hasAggregation( List nameList, List dataSetCCList )
			throws DataException
	{
		try
		{
			for ( int k = 0; k < nameList.size( ); k++ )
			{
				IComputedColumn column = null;
				for ( int i = 0; i < dataSetCCList.size( ); i++ )
				{
					column = (IComputedColumn) dataSetCCList.get( i );
					if ( column.getName( ) != null &&
							column.getName( ).equals( nameList.get( k ) ) )
						break;
					else
						column = null;
				}
				if ( column != null )
				{
					if ( ExpressionCompilerUtil.hasAggregationInExpr( column.getExpression( ) ) )