Update datafusion/physical-plan/src/projection.rs

Co-authored-by: Andrew Lamb <[email protected]>
splitgraph · Feb 2, 2024 · 4209e68 · 4209e68
1 parent 71bf589
commit 4209e68
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/datafusion/physical-plan/src/projection.rs b/datafusion/physical-plan/src/projection.rs
@@ -56,7 +56,8 @@ pub struct ProjectionExec {
     input: Arc<dyn ExecutionPlan>,
     /// The output ordering
     output_ordering: Option<Vec<PhysicalSortExpr>>,
-    /// The output equivalence properties
+    /// The output equivalence properties. Cached here as computing them
+    /// can be expensive, see <https://github.com/apache/arrow-datafusion/pull/9097>
     equivalence_properties: EquivalenceProperties,
     /// The mapping used to normalize expressions like Partitioning and
     /// PhysicalSortExpr that maps input to output