houqp commented on a change in pull request #605:
URL: https://github.com/apache/arrow-datafusion/pull/605#discussion_r667379802
##########
File path: datafusion/src/logical_plan/plan.rs
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@@ -354,6 +356,43 @@ impl LogicalPlan {
| LogicalPlan::CreateExternalTable { .. } => vec![],
}
}
+
+ /// returns all `Using` join columns in a logical plan
+ pub fn using_columns(&self) -> Result<Vec<HashSet<Column>>,
DataFusionError> {
Review comment:
@alamb this is used outside of the optimizers as well, for example, the
logical plan builder. With that context, do you still think it should live in
optimizer utils module?
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