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
populateComputedColumns( this.getAggrComputedColumns( aggCCList, false ));
		
		
		
		this.populator.getQuery( ).setMaxRows( originalMaxRows );
	}
	
	/**
	 * 
	 * @param aggrComputedColumns
	 * @throws DataException
	 */
	private void populateAggrCCs( List aggrComputedColumns )
			throws DataException
	{
		if ( aggrComputedColumns.size( ) == 0 )
			return;
		ExpressionCompiler compiler = new ExpressionCompiler( );
		compiler.setDataSetMode( true );
		try
		{
			Context cx = Context.enter( );
			List aggrInfos = new ArrayList( );
			List aggrNames = new ArrayList( );
			for ( int i = 0; i < aggrComputedColumns.size( ); i++ )
			{
				ComputedColumn cc = (ComputedColumn) aggrComputedColumns.get( i );
				List args = cc.getAggregateArgument( );
				IBaseExpression[] exprs = null;
				int offset = 0;