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
new FilterExpressionParser( null, null ).compileFilterExpression( expr4Exception );
			}
			catch ( DataException e )
			{
				return true;
			}
		}
		return false;
	}
	/*
	 * @see org.eclipse.birt.data.engine.impl.IQueryExecutor#getResultMetaData()
	 */
	public IResultMetaData getResultMetaData( ) throws DataException
	{
		assert odiQuery instanceof IPreparedDSQuery
				|| odiQuery instanceof ICandidateQuery
				|| odiQuery instanceof JointDataSetQuery;
		if ( odiQuery instanceof IPreparedDSQuery )
		{
			if ( ( (IPreparedDSQuery) odiQuery ).getResultClass( ) != null )
				return new ResultMetaData( ( (IPreparedDSQuery) odiQuery ).getResultClass( ) );
			else
				return null;
		}
		else if ( odiQuery instanceof JointDataSetQuery )
		{
			return new ResultMetaData( ( (JointDataSetQuery) odiQuery ).getResultClass( ) );
		}
		else
		{