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/expression/ExpressionProcessor.java
IBaseExpression baseExpression = null;
		for ( int i = 0; i < list.size( ); i++ )
		{
			baseExpression = (IBaseExpression)list.get( i );
			compileBaseExpression(baseExpression);
		}
		hasAggregate = helper.getAggregateStatus( );
		this.clear( );
		return hasAggregate;
	}
	
	/**
	 * 
	 * @param expression
	 * @return
	 */
	public boolean hasAggregation(IBaseExpression expression) throws DataException
	{
		boolean hasAggregate = false;
		IBaseExpression baseExpression = expression;
		
		compileBaseExpression(baseExpression);
		
		hasAggregate = helper.getAggregateStatus( );
		this.clear( );
		return hasAggregate;
	}
	/**
	 * 
	 * @param baseExpression