diff --git a/src/logging.rs b/src/logging.rs
index 4d7de783d..628f283af 100644
--- a/src/logging.rs
+++ b/src/logging.rs
@@ -1,5 +1,6 @@
 //! Loggers and logging events for differential dataflow.
 
+use columnar::Columnar;
 use serde::{Deserialize, Serialize};
 
 /// Logger for differential dataflow events.
@@ -19,7 +20,7 @@ where
 }
 
 /// Possible different differential events.
-#[derive(Debug, Clone, Ord, PartialOrd, Eq, PartialEq, Serialize, Deserialize)]
+#[derive(Debug, Clone, Ord, PartialOrd, Eq, PartialEq, Serialize, Deserialize, Columnar)]
 pub enum DifferentialEvent {
     /// Batch creation.
     Batch(BatchEvent),
@@ -36,7 +37,7 @@ pub enum DifferentialEvent {
 }
 
 /// Either the start or end of a merge event.
-#[derive(Debug, Clone, Ord, PartialOrd, Eq, PartialEq, Serialize, Deserialize)]
+#[derive(Debug, Clone, Ord, PartialOrd, Eq, PartialEq, Serialize, Deserialize, Columnar)]
 pub struct BatchEvent {
     /// Operator identifier.
     pub operator: usize,
@@ -48,7 +49,7 @@ impl From<BatchEvent> for DifferentialEvent { fn from(e: BatchEvent) -> Self { D
 
 
 /// Either the start or end of a merge event.
-#[derive(Debug, Clone, Ord, PartialOrd, Eq, PartialEq, Serialize, Deserialize)]
+#[derive(Debug, Clone, Ord, PartialOrd, Eq, PartialEq, Serialize, Deserialize, Columnar)]
 pub struct BatcherEvent {
     /// Operator identifier.
     pub operator: usize,
@@ -65,7 +66,7 @@ pub struct BatcherEvent {
 impl From<BatcherEvent> for DifferentialEvent { fn from(e: BatcherEvent) -> Self { DifferentialEvent::Batcher(e) } }
 
 /// Either the start or end of a merge event.
-#[derive(Debug, Clone, Ord, PartialOrd, Eq, PartialEq, Serialize, Deserialize)]
+#[derive(Debug, Clone, Ord, PartialOrd, Eq, PartialEq, Serialize, Deserialize, Columnar)]
 pub struct DropEvent {
     /// Operator identifier.
     pub operator: usize,
@@ -76,7 +77,7 @@ pub struct DropEvent {
 impl From<DropEvent> for DifferentialEvent { fn from(e: DropEvent) -> Self { DifferentialEvent::Drop(e) } }
 
 /// Either the start or end of a merge event.
-#[derive(Debug, Clone, Ord, PartialOrd, Eq, PartialEq, Serialize, Deserialize)]
+#[derive(Debug, Clone, Ord, PartialOrd, Eq, PartialEq, Serialize, Deserialize, Columnar)]
 pub struct MergeEvent {
     /// Operator identifier.
     pub operator: usize,
@@ -93,7 +94,7 @@ pub struct MergeEvent {
 impl From<MergeEvent> for DifferentialEvent { fn from(e: MergeEvent) -> Self { DifferentialEvent::Merge(e) } }
 
 /// A merge failed to complete in time.
-#[derive(Debug, Clone, Ord, PartialOrd, Eq, PartialEq, Serialize, Deserialize)]
+#[derive(Debug, Clone, Ord, PartialOrd, Eq, PartialEq, Serialize, Deserialize, Columnar)]
 pub struct MergeShortfall {
     /// Operator identifier.
     pub operator: usize,
@@ -106,7 +107,7 @@ pub struct MergeShortfall {
 impl From<MergeShortfall> for DifferentialEvent { fn from(e: MergeShortfall) -> Self { DifferentialEvent::MergeShortfall(e) } }
 
 /// Either the start or end of a merge event.
-#[derive(Debug, Clone, Ord, PartialOrd, Eq, PartialEq, Serialize, Deserialize)]
+#[derive(Debug, Clone, Ord, PartialOrd, Eq, PartialEq, Serialize, Deserialize, Columnar)]
 pub struct TraceShare {
     /// Operator identifier.
     pub operator: usize,