Method parse

src/sql/src/session/vars.rs:1074–1079

(&self, input: VarInput)

    }

    fn parse(&self, input: VarInput) -> Result<Box<dyn Value>, VarError> {
        let v = self.definition.parse(input)?;
        // Validate our parsed value.
        self.validate_constraints(v.as_ref())?;
        Ok(v)
    }

    fn set(&mut self, input: VarInput) -> Result<bool, VarError> {
        let v = self.parse(input)?;