Method product

src/sql/src/plan/scope.rs:497–514

(self, right: Self)

    }

    pub fn product(self, right: Self) -> Result<Self, PlanError> {
        let mut l_tables = self.table_names().into_iter().collect::<Vec<_>>();
        // Make ordering deterministic for testing
        l_tables.sort_by(|l, r| l.item.cmp(&r.item));
        let r_tables = right.table_names();
        for l in l_tables {
            for r in &r_tables {
                if l.matches(r) {
                    sql_bail!("table name \"{}\" specified more than once", l.item)
                }
            }
        }
        Ok(Scope {
            items: self.items.into_iter().chain(right.items).collect(),
            ungrouped_columns: vec![],
            lateral_barrier: false,
        })
    }

    pub fn project(&self, columns: &[usize]) -> Self {
        Scope {