Method with_key

src/repr/src/relation.rs:312–318

Adds a new key for the relation.

(mut self, mut indices: Vec<usize>)

    /// Adds a new key for the relation.
    pub fn with_key(mut self, mut indices: Vec<usize>) -> Self {
        indices.sort_unstable();
        if !self.keys.contains(&indices) {
            self.keys.push(indices);
        }
        self
    }

    pub fn with_keys(mut self, keys: Vec<Vec<usize>>) -> Self {
        for key in keys {