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
else
					{
						temporaryComputedColumns.add( new ComputedColumn( groupName,
								expr,
								DataType.INTEGER_TYPE ) );
					}
					
				}
				else
				{
					temporaryComputedColumns.add( new ComputedColumn( groupName,
							expr,
							QueryExecutorUtil.getTempComputedColumnType( groupSpecs[i].getInterval( ) ) ) );
				}
			}
			odiQuery.setGrouping( Arrays.asList( groupSpecs ) );
		}
	}
	/**
	 * get the data type of a expression
	 * @param cx
	 * @param expr
	 * @return
	 */
	private int getColumnDataType( Context cx, String expr )
	{
		String columnName = QueryExecutorUtil.getColInfoFromJSExpr( cx, expr )
				.getColumnName( );
		if ( columnName == null )
		{