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
{
							throw DataException.wrap( e );
						}
					}
				}
				acc.onRow( aggrArgs[aggrIndex] );
				newGroup = false;
			}
			catch ( DataException e )
			{
				if ( invalidAggrMsg == null )
					invalidAggrMsg = new HashMap( );
				invalidAggrMsg.put( new Integer( aggrIndex ), e );
				return false;
			}
		}
		
		
		boolean isRunning = ( aggrInfo.getAggregation( ).getType( ) == IAggregation.RUNNING_AGGR );
		
		if ( isRunning && populateValue )
		{
			Object value = acc.getValue( );
			currentRoundAggrValue[aggrIndex].add( value );
		}
		if ( endingGroupLevel <= aggrInfo.getGroupLevel( ) )
		{
			
			
			acc.finish( );