Method as_const

src/expr/src/relation.rs:1096–1102

If self is a constant, return the value and the type, otherwise `None`. Looks behind `ArrangeBy`s.

(&self)

    /// If self is a constant, return the value and the type, otherwise `None`.
    /// Looks behind `ArrangeBy`s.
    pub fn as_const(&self) -> Option<(&Result<Vec<(Row, Diff)>, EvalError>, &ReprRelationType)> {
        match self {
            MirRelationExpr::Constant { rows, typ } => Some((rows, typ)),
            MirRelationExpr::ArrangeBy { input, .. } => input.as_const(),
            _ => None,
        }
    }

    /// If self is a constant, mutably return the value and the type, otherwise `None`.
    /// Looks behind `ArrangeBy`s.