Method try_parse_grouping

nodedb/src/control/promql/parser.rs:310–318

(&mut self)

    }

    fn try_parse_grouping(&mut self) -> Result<Grouping, PromqlError> {
        if self.try_keyword("by") {
            return Ok(Grouping::By(self.parse_label_list()?));
        }
        if self.try_keyword("without") {
            return Ok(Grouping::Without(self.parse_label_list()?));
        }
        Ok(Grouping::None)
    }

    fn parse_label_list(&mut self) -> Result<Vec<String>, PromqlError> {
        self.expect(&Token::LParen)?;