Method parse_window_frame

src/sql-parser/src/parser.rs:903–923

(&mut self)

    }

    fn parse_window_frame(&mut self) -> Result<WindowFrame, ParserError> {
        let units = match self.expect_one_of_keywords(&[ROWS, RANGE, GROUPS])? {
            ROWS => WindowFrameUnits::Rows,
            RANGE => WindowFrameUnits::Range,
            GROUPS => WindowFrameUnits::Groups,
            _ => unreachable!(),
        };
        let (start_bound, end_bound) = if self.parse_keyword(BETWEEN) {
            let start_bound = self.parse_window_frame_bound()?;
            self.expect_keyword(AND)?;
            let end_bound = Some(self.parse_window_frame_bound()?);
            (start_bound, end_bound)
        } else {
            (self.parse_window_frame_bound()?, None)
        };
        Ok(WindowFrame {
            units,
            start_bound,
            end_bound,
        })
    }

    /// Parse `CURRENT ROW` or `{ <positive number> | UNBOUNDED } { PRECEDING | FOLLOWING }`
    fn parse_window_frame_bound(&mut self) -> Result<WindowFrameBound, ParserError> {