Struct is public only within crate. (#210)

* Struct is public only within crate.

* Declare pub(crate) in mod.rs.

Author: JSOD11

src/execution_plans/metrics.rs

@@ -11,7 +11,7 @@ use std::fmt::{Debug, Formatter};
 
 /// A transparent wrapper that delegates all execution to its child but returns custom metrics. This node is invisible during display.
 /// The structure of a plan tree is closely tied to the [TaskMetricsRewriter].
-pub struct MetricsWrapperExec {
+pub(crate) struct MetricsWrapperExec {
     inner: Arc<dyn ExecutionPlan>,
     /// metrics for this plan node.
     metrics: MetricsSet,
@@ -21,7 +21,7 @@ pub struct MetricsWrapperExec {
 }
 
 impl MetricsWrapperExec {
-    pub fn new(inner: Arc<dyn ExecutionPlan>, metrics: MetricsSet) -> Self {
+    pub(crate) fn new(inner: Arc<dyn ExecutionPlan>, metrics: MetricsSet) -> Self {
         Self {
             inner,
             metrics,

src/execution_plans/mod.rs

@@ -6,7 +6,7 @@ mod network_shuffle;
 mod partition_isolator;
 
 pub use distributed::DistributedExec;
-pub use metrics::MetricsWrapperExec;
+pub(crate) use metrics::MetricsWrapperExec;
 pub use network_coalesce::{NetworkCoalesceExec, NetworkCoalesceReady};
 pub use network_shuffle::{NetworkShuffleExec, NetworkShuffleReadyExec};
 pub use partition_isolator::PartitionIsolatorExec;