Method derived_context

src/sql/src/plan/query.rs:6598–6616

Generate a new `QueryContext` appropriate to be used in subqueries of `self`.

(&self, scope: Scope, relation_type: SqlRelationType)

    /// Generate a new `QueryContext` appropriate to be used in subqueries of
    /// `self`.
    fn derived_context(&self, scope: Scope, relation_type: SqlRelationType) -> QueryContext<'a> {
        let ctes = self.ctes.clone();
        let outer_scopes = iter::once(scope).chain(self.outer_scopes.clone()).collect();
        let outer_relation_types = iter::once(relation_type)
            .chain(self.outer_relation_types.clone())
            .collect();
        // These shenanigans are simpler than adding `&mut NameManager` arguments everywhere.
        let name_manager = Rc::clone(&self.name_manager);

        QueryContext {
            scx: self.scx,
            lifetime: self.lifetime,
            outer_scopes,
            outer_relation_types,
            ctes,
            name_manager,
            recursion_guard: self.recursion_guard.clone(),
        }
    }

    /// Derives a `QueryContext` for a scope that contains no columns.
    fn empty_derived_context(&self) -> QueryContext<'a> {