compiler.py

class SQLCompiler(compiler.SQLCompiler):
    def resolve_columns(self, row, fields=()):
        # If the results are sliced, the resultset will have an initial 
        # "row number" column. Remove this column before the ORM sees it.
        if getattr(self, '_using_row_number', False):
            row = row[1:]
        
        values = []
        index_extra_select = len(self.query.extra_select.keys())
        for value, field in map(None, row[index_extra_select:], fields):
            if field:
                try:
                    val = self.connection.ops.convert_values(value, field)
                except ValueError:
                    val = value
            values.append(val)
        return row[:index_extra_select] + tuple(values)