Method union

src/sql/src/plan/hir.rs:1908–1926

(self, other: Self)

    }

    pub fn union(self, other: Self) -> Self {
        let mut terms = Vec::new();
        if let HirRelationExpr::Union { base, inputs } = self {
            terms.push(*base);
            terms.extend(inputs);
        } else {
            terms.push(self);
        }
        if let HirRelationExpr::Union { base, inputs } = other {
            terms.push(*base);
            terms.extend(inputs);
        } else {
            terms.push(other);
        }
        HirRelationExpr::Union {
            base: Box::new(terms.remove(0)),
            inputs: terms,
        }
    }

    pub fn exists(self) -> HirScalarExpr {
        HirScalarExpr::Exists(Box::new(self), NameMetadata::default())