viirya commented on code in PR #8128:
URL: https://github.com/apache/arrow-datafusion/pull/8128#discussion_r1390684353
##########
datafusion/physical-plan/src/lib.rs:
##########
@@ -203,7 +203,23 @@ pub trait ExecutionPlan: Debug + DisplayAs + Send + Sync {
.collect()
}
- /// Get the [`EquivalenceProperties`] within the plan
+ /// Get the [`EquivalenceProperties`] within the plan.
+ ///
+ /// Equivalence properties tell DataFsion what columns are known to be
+ /// equal, during various optimization passes. By default, this returns "
no
+ /// known equivalances" which is always correct, but may cause DataFusion
to
+ /// unecessairly resort data.
Review Comment:
```suggestion
/// known equivalences" which is always correct, but may cause
DataFusion to
/// unnecessarily resort data.
```
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