misc cleanup

Author: adriangb

src/distributed_physical_optimizer_rule.rs

@@ -84,8 +84,7 @@ impl DistributedPhysicalOptimizerRule {
                 )?);
 
                 let maybe_isolated_plan =
-                    if can_be_divided(&plan)? && self.partitions_per_task.is_some() {
-                        let ppt = self.partitions_per_task.unwrap();
+                    if let Some(ppt) = self.partitions_per_task && can_be_divided(&plan)? {
                         let isolated = Arc::new(PartitionIsolatorExec::new(child, ppt));
                         plan.with_new_children(vec![isolated])?
                     } else {