Bug 168026 Still use the existing data binding even though the aggregate is different
I had a table in which a data binding which aggregates on a group. When I insert a new data item in the report, although the expressions are same, it aggregates on All, then it refered to the existing data binding. The expected behavior would be a new data binding is created with different aggregates.
model/org.eclipse.birt.report.model.tests/test/org/eclipse/birt/report/model/api/ReportItemHandleTest.java
catch ( SemanticException e )
		{
			assertEquals( PropertyValueException.DESIGN_EXCEPTION_VALUE_EXISTS,
					e.getErrorCode( ) );
		}
		
		try
		{
			textHandle.addColumnBinding( tmpComputedColumn, true );
			fail( );
		}
		catch ( SemanticException e )
		{
			assertEquals( PropertyValueException.DESIGN_EXCEPTION_VALUE_EXISTS,
					e.getErrorCode( ) );
		}
		
		tmpComputedColumn.setExpression( "new column1 expr" ); 
		try
		{
			textHandle.addColumnBinding( tmpComputedColumn, true );
			fail( );
		}
		catch ( SemanticException e )
		{
			assertEquals( PropertyValueException.DESIGN_EXCEPTION_VALUE_EXISTS,
					e.getErrorCode( ) );
		}
		textHandle.addColumnBinding( tmpComputedColumn, false );
		assertEquals( 1, list.size( ) );