Bug 132515 Expression like "Toltal.rank(Tolta.ave(row[a]),ture,Null,1)" is return an error
Description: Add an expression like "Toltal.rank(Tolta.ave(row[a]),ture,Null,1)" is return an error.The nesting "Toltal" seem not to be work. Step to reproduce: 1.new a datasource and dataset 2.drag the dataset to layout veiw for a table 3.set a group on the table 4.Insert a data into the group header with the expression e.g. "Toltal.rank(Tolta.ave(row[a]),ture,Null,1)" Actual result: An error was thrown out Expected result: It should work correctly in order to support some requirments
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryExecutor.java
{
					try
					{						
						expr = ExpressionUtil.createGroupByExpression( src.getInterval( ),
								src.getIntervalStart( ),
								getGroupKeyExpression( src ),
								src.getIntervalRange( ),
								getColumnDataType(cx, expr));
						
					}
					catch(BirtException be)
					{
						throw DataException.wrap( be );
					}
				}
				IQuery.GroupSpec dest = QueryExecutorUtil.groupDefnToSpec( cx,
						src,
						expr,
						groupName,
						-1 );
				groupSpecs[i] = dest;
				if ( ( dest.getInterval( ) != IGroupDefinition.NO_INTERVAL )
						&& ( dest.getIntervalRange( ) != 0 ) )
				{
					if (dest.getInterval( ) == IGroupDefinition.STRING_PREFIX_INTERVAL)
					{
						temporaryComputedColumns.add( new ComputedColumn( groupName,
								expr,
								DataType.STRING_TYPE ) );
					}