public static List extractColumnExpression( IConditionalExpression expression ) throws DataException
public static List extractColumnExpression( IBaseExpression expression ) throws DataException
	public static List extractColumnExpression(			IConditionalExpression expression ) throws DataException	{		if ( expression == null )			return null;		List list = new ArrayList( );		populateColumnList( list, expression.getExpression( ) );		populateColumnList( list, expression.getOperand1( ) );		populateColumnList( list, expression.getOperand2( ) );		return list;	}