Bug 176107 row.__rownum cannot be directly used as group key
Create a table that bind it to a data set. Insert a group. For the Group On field, click on the "..." button to edit the expression, and select from "Availble Column Bindings" | "Table" | "RowNum". This creates a Group On Expression "row.__rownum". The resulting report design cannot be run. It produces error: Column binding "row.__rownum" does not exist. To workaround this, one must create another binding on the table and set its expression to "row.__rownum", then use the new binding as group key. This should not have been necessary. The "__rownum" binding should be implicitly available in all contexts that have a data set. E.g., it should be usable directly as group key, sort key, and in conditional format expressions, etc. Attached is a sample report that produces the error.
data/org.eclipse.birt.data.tests/test/org/eclipse/birt/data/engine/binding/GroupOnRowTest.java
String outputStr = getOutputStrForGroupTest( 30,
				qd,
				groupDefn.length,
				bindingNameRow,
				columnStr );
		testPrint( outputStr );
		this.checkOutputFile( );
	}
	
	
	/**
	 * Test feature of group on second
	 * 
	 * @throws Exception
	 */
	public void testGroupOnSecond(  ) throws Exception
	{
		groupOnSecond( "2005-1-1" );
		
	}
	
	/**
	 * Test feature of group on second
	 * 
	 * @throws Exception
	 */
	public void testGroupOnSecond1(  ) throws Exception
	{
		groupOnSecond( null );
	}