Method constant

src/expr/src/relation.rs:1069–1072

Constructs a constant collection from specific rows and schema, where each row will have a multiplicity of one.

(rows: Vec<Vec<Datum>>, typ: ReprRelationType)

    /// Constructs a constant collection from specific rows and schema, where
    /// each row will have a multiplicity of one.
    pub fn constant(rows: Vec<Vec<Datum>>, typ: ReprRelationType) -> Self {
        let rows = rows.into_iter().map(|row| (row, Diff::ONE)).collect();
        MirRelationExpr::constant_diff(rows, typ)
    }

    /// Constructs a constant collection from specific rows and schema, where
    /// each row can have an arbitrary multiplicity.