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
}
	/**
	 * 
	 * @param cx
	 * @param dataSetFilters
	 * @param temporaryComputedColumns
	 * @param result
	 */
	private void prepareFilter( Context cx, List dataSetFilters,
			List temporaryComputedColumns, List result )
	{
		if ( dataSetFilters != null && !dataSetFilters.isEmpty( ) )
		{
			Iterator it = dataSetFilters.iterator( );
			for ( int i = 0; it.hasNext( ); i++ )
			{
				IFilterDefinition src = (IFilterDefinition) it.next( );
				IBaseExpression expr = src.getExpression( );
				if ( isGroupFilter( src ) )
				{
					ConditionalExpression ce = ( (ConditionalExpression) expr );
					String exprText = ce.getExpression( ).getText( );
					ColumnInfo columnInfo = QueryExecutorUtil.getColInfoFromJSExpr( cx,
							exprText );
					int index = columnInfo.getColumnIndex( );
					String name = columnInfo.getColumnName( );
					if ( name == null && index < 0 )
					{