Method try_parse_set_matching

nodedb/src/control/promql/parser.rs:398–412

(&mut self)

    }

    fn try_parse_set_matching(&mut self) -> Result<Option<VectorMatching>, PromqlError> {
        let has_on = self.try_keyword("on");
        let has_ignoring = !has_on && self.try_keyword("ignoring");
        if !has_on && !has_ignoring {
            return Ok(None);
        }
        let labels = self.parse_label_list()?;
        Ok(Some(VectorMatching {
            card: MatchCard::OneToOne,
            on: if has_on { labels.clone() } else { vec![] },
            ignoring: if has_ignoring { labels } else { vec![] },
            group_left: vec![],
            group_right: vec![],
        }))
    }
}

fn apply_offset(expr: Expr, offset: Duration) -> Expr {