Method parse_aggregation

nodedb/src/control/promql/parser.rs:222–253

(&mut self, op: AggOp)

    }

    fn parse_aggregation(&mut self, op: AggOp) -> Result<Expr, PromqlError> {
        self.advance();
        let grouping_before = self.try_parse_grouping()?;

        self.expect(&Token::LParen)?;
        let param = if matches!(
            op,
            AggOp::Topk | AggOp::Bottomk | AggOp::Quantile | AggOp::CountValues
        ) {
            let p = self.parse_expr(0)?;
            self.expect(&Token::Comma)?;
            Some(Box::new(p))
        } else {
            None
        };

        let expr = self.parse_expr(0)?;
        self.expect(&Token::RParen)?;

        let grouping = if matches!(grouping_before, Grouping::None) {
            self.try_parse_grouping()?
        } else {
            grouping_before
        };

        Ok(Expr::Aggregate {
            op,
            expr: Box::new(expr),
            param,
            grouping,
        })
    }

    fn parse_label_matchers(&mut self) -> Result<Vec<LabelMatcher>, PromqlError> {
        self.expect(&Token::LBrace)?;