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.report.data.adapter/src/org/eclipse/birt/report/data/adapter/internal/adapter/ComputedColumnAdapter.java
{
	public ComputedColumnAdapter ( ComputedColumnHandle modelCmptdColumn ) throws AdapterException
	{
		
		
		super( modelCmptdColumn.getName( ),
				modelCmptdColumn.getExpression( ),
				org.eclipse.birt.report.data.adapter.api.DataAdapterUtil.adaptModelDataType( modelCmptdColumn.getDataType( ) ),
				org.eclipse.birt.report.data.adapter.api.DataAdapterUtil.adaptModelAggregationType( modelCmptdColumn.getAggregateFunction( )),
				modelCmptdColumn.getFilterExpression( ) == null ? null:new ScriptExpression( modelCmptdColumn.getFilterExpression( )),
				populateArgument(modelCmptdColumn));
	}
	
	private static List populateArgument( ComputedColumnHandle modelCmptdColumn )
	{
		List argument = new ArrayList();
		Iterator it = modelCmptdColumn.argumentsIterator( );
		while( it!= null && it.hasNext( ))
		{
			AggregationArgumentHandle arg = (AggregationArgumentHandle)it.next( );
			argument.add( arg.getValue( ) );
		}
		return argument;
	}
}