:type column_values: list of (column, value_json)

def _set(self, ctx, table_name, record_id, column_values):
        """
        :type column_values: list of (column, value_json)
        """
        vsctl_table = self._get_table(table_name)
        ovsrec_row = ctx.must_get_row(vsctl_table, record_id)
        for column, value in column_values:
            ctx.set_column(ovsrec_row, column, value)
        ctx.invalidate_cache()