Bug 208168 Meaningless exception occurs when sorting condition refer to a unused binding[07]
Description: Meaningless exception occurs when sorting condition refer to a unused binding[07] Build number: 2.3.0.v2007-0800 Steps to reproduce: 1, New a table binding with a dataset 2, Define a Sort for the table 3, Delete the binding of table which is using by sorting condition 4, Preview Expected result: The exception should be meaningful. Actual result: Exception is meaningless for user to clear the mistake point Error log: An error happen during population of data. This might be caused by including data of mixed type in a column of "ANY" type
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/ComputedColumnHelper.java
*/
	public boolean process( IResultObject resultObject, int rowIndex )
			throws DataException
	{
		logger.entering( ComputedColumnHelper.class.getName( ), "process" );
		assert resultObject != null;
		IResultClass resultClass = resultObject.getResultClass( );
		if ( isPrepared == false )
			prepare( resultClass );
		
		
		if ( computedColumn.length == 0 )
		{
			logger.exiting( ComputedColumnHelper.class.getName( ), "process" );
			return true; 
		}
		
		dataSet.setRowObject( resultObject, true );
		dataSet.setCurrentRowIndex( rowIndex );
		
		
		Context cx = Context.enter( );
		try
		{
			
			
			for ( int i = 0; i < computedColumn.length; i++ )
			{
				if ( computedColumn[i].getExpression( ) != null )
				{